Yasuharu Sato

Okayama University, Okayama, Okayama, Japan

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Publications (91)249.62 Total impact

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    ABSTRACT: We describe a 74-year-old Japanese man with systemic fibroinflammatory conditions closely resembling those of immunoglobulin G4-related disease (IgG4-RD). Radiology and histology showed characteristics of IgG4-related tubulointerstitial nephritis, despite normal serum IgG4 value and scanty IgG4-positive plasma cell infiltration in each organ. This case suggests that a condition closely mimicking IgG4-RD may develop without IgG4-positive plasma cells and those exceptional cases should also be taken into account in the differential diagnosis of IgG4-RD.
    Modern Rheumatology 06/2014; DOI:10.3109/14397595.2014.916836 · 2.40 Impact Factor
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    ABSTRACT: Primary cutaneous γδ T-cell lymphoma (PCGD-TCL) is an aggressive lymphoma consisting of clonal proliferation of mature activated γδ T-cells of a cytotoxic phenotype. Because PCGD-TCL is a rare disease, there are few clinicopathological study reports. In addition, T-cell receptor (TCR) γδ cells are typically immunostained in frozen sections or determined by TCRβ negativity. We retrospectively analyzed 17 primary cutaneous T-cell lymphomas of the γδ phenotype (CTCL-γδ) in a clinicopathological and molecular study using paraffin-embedded sections. Eleven of 17 patients had CTCL-γδ without subcutaneous panniculitis-like T-cell lymphoma (SPTCL) features and 6 had CTCL-γδ with SPTCL features. Immunophenotypically, some significant differences were found in CD8 and CD56 positivity between our patient series of CTCL-γδ patients with SPTCL features and SPTCL-γδ patients described in the previous literature. The univariate analysis of 17 CTCL-γδ patients showed that more than 60 years old age, presence of visceral organ involvement, and small-to-medium cell size were poor prognostic factors. In addition, the 5-year overall survival rate was 42.4% for the CTCL-γδ patients without SPTCL features and 80.0% for those with SPTCL features. Consequently, there was a strikingly significant difference in overall survival among SPTCL, CTCL-γδ with SPTCL features and CTCL-γδ without SPTCL features (P = 0.0005). Our data suggests that indolent subgroup may exist in CTCL-γδ. Studies on more cases including multinational areas are warranted to delineate the clinicopathological features and the significance in these rare lymphomas.This article is protected by copyright. All rights reserved.
    Cancer Science 05/2014; 105(7). DOI:10.1111/cas.12439 · 3.52 Impact Factor
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    ABSTRACT: IgG4-related lymphadenopathy with increased numbers of Epstein-Barr virus (EBV)-infected cells has been reported but not fully described. We analyzed 31 cases of IgG4-related lymphadenopathy and 24 cases of extranodal IgG4-related diseases for their possible relationship with EBV. Other types of reactive lymph nodes (22) and angioimmunoblastic T-cell lymphoma (AITL) (10) were also studied for comparison. EBV-encoded RNA (EBER) in situ hybridization revealed EBER cells in 18 of 31 cases (58%) of IgG4-related lymphadenopathy. Increased EBER cells were found in only 4 of 22 (18.1%) non-IgG4-related reactive lymphoid hyperplasia in patients of a similar age (P=0.002) and in only 5 of 24 (21%) extranodal IgG4-related biopsies (P=0.006). Interestingly, all patients with EBER progressively transformed germinal center-type IgG4-related lymphadenopathy had systemic lymphadenopathy and/or extranodal involvement. AITL also is associated with EBV, and IgG4-related lymphadenopathy sometimes mimics the morphology of AITL; however, the number of IgG4 cells in AITL was significantly less than that in IgG4-related lymphadenopathy (P<0.001). Increased numbers of regulatory T cells are seen in IgG4-related disease; however, there was not a significant difference between the EBER and EBER cases. In conclusion, the presence of increased numbers of EBV-infected cells in IgG4-related lymphadenopathy, compared with other reactive lymphadenopathy or extranodal IgG4-related disease, suggests that there may be a relationship at least between nodal IgG4-related disease and EBV. It is important to avoid overdiagnosing these cases as malignant lymphomas or EBV-related lymphoproliferative disorders.
    The American journal of surgical pathology 04/2014; 38(7). DOI:10.1097/PAS.0000000000000206 · 5.15 Impact Factor
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    ABSTRACT: Background: Few studies have investigated the prognostic factors for nasal natural killer (NK)/T-cell lymphoma. Methods: This was a retrospective multicenter clinical study. The clinical records of 36 patients with nasal NK/T-cell lymphoma who had been first treated between 1996 and 2011 were collected from 12 hospitals. Results: High serum levels of C-reactive protein (≥1.0 mg/dL), lactate dehydrogenase (≥350 IU/L), and soluble interleukin-2 receptor (sIL-2R; ≥600 U/mL) were associated with worse prognosis. A prognostic score was devised by totaling the number of these 3 predictors: 0 or 1 = score 0; and 2 or 3 = score 1. As for tumor invasion, local invasion beyond the nasal cavity was associated with poor prognosis, and a prognostic score was devised as: tumor restricted to nasal cavity, yes = score 0; no = score 1. A novel prognostic index (NPI) was established based on these scores from 0 to 2. Disease-specific survival rates at 5 years were: 90.0% for NPI = 0; 29.3% for NPI = 1; and 0.0% for NPI = 2. Conclusion: Our NPI is valid for anticipating prognosis of nasal NK/T-cell lymphoma.
    Head & Neck 04/2014; 36(4). DOI:10.1002/hed.23322 · 2.64 Impact Factor
  • Mai Takeuchi · Yasuharu Sato · Tadashi Yoshino ·
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    ABSTRACT: Diagnosis of malignant lymphoma is based on the 4th edition of World Health Organization (WHO) Classification of Tumours of Haematopoietic and Lymphoid Tissues. The frequency of malignant lymphoma subtypes depends on age, race and geography. In Asian countries, Hodgkin lymphoma and follicular lymphoma are less frequent compared to Western countries. However, the number of patients with follicular lymphoma is now increasing in Japan. In contrast, in Japan, adult T-cell leukemia/lymphoma is more frequent than in Western and other Asian countries, because it relates to distribution of human T-cell leukemia virus type 1(HTLV-1).
    Nippon rinsho. Japanese journal of clinical medicine 03/2014; 72(3):436-40.
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    ABSTRACT: Follicular lymphoma (FL) of the gastrointestinal tract, particularly duodenal follicular lymphoma (DFL), is a rare variant of FL with indolent clinical behavior, and this disease is included in 2008 WHO classifications. In contrast to nodal follicular lymphoma (NFL), DFL occurs most frequently in the second part of the duodenum, lacks follicular dendritic cell meshworks, and has memory B-cell characteristics. However, its molecular pathogenesis is still unclear. In the present study, we examined 10 DFL, 18 NFL, 10 gastric MALT lymphoma samples by gene expression analysis. Quantitative RT-PCR experiments and immunohistochemical analysis for 72 formalin-fixed, paraffin-embedded tissues from an independent series, including 32 DFL, 19 gastric MALT lymphoma, and 27 NFL samples were performed for validation of microarray data. Gene expression profiles of the 3 lymphoma types were compared using 2,918 differentially expressed genes (DEGs) and results suggested that DFL shares characteristics of MALT lymphoma. Among these DEGs, CCL20, and MAdCAM-1 were up-regulated in DFL and MALT but down-regulated in NFL. In contrast, protocadherin gamma subfamily genes were up-regulated in DFL and NFL. Quantitative RT-PCR and immunohistochemical studies demonstrated concordant results. Double immunofluorescence studies revealed that CCL20 and CCR6 were co-expressed in both DFL and MALT. We hypothesize that increased expression of CCL20 and MAdCAM-1 and co-expression of CCL20 and CCR6 may play an important role in tumorigenesis. This article is protected by copyright. All rights reserved.
    Cancer Science 03/2014; 105(5). DOI:10.1111/cas.12392 · 3.52 Impact Factor
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    ABSTRACT: A 77-year-old man, with a lengthy medical history of chronic dysuria, constipation, hypertension, myocardial infarction, and a submandibular lymphadenopathy that was excised 3 years ago, was hospitalized due to elevated liver enzyme levels. He demonstrated hypergammaglobulinemia, hyperproteinemia, high levels of IgG and IgG4, eosinophilia, sclerosing cholangitis, and retroperitoneal fibrosis. He was diagnosed with IgG4-related disease (IgG4-RD). While hospitalized, he had several episodes of syncope while standing and was diagnosed with autonomic nerve dysfunction. Thirty days after hospitalization, he died of nonocclusive mesenteric ischemia (NOMI). Post-mortem, his submandibular lymphadenopathy lesion was diagnosed with progressively transformed germinal center (PTGC)-type IgG4-related lymphadenopathy. At autopsy, small and large intestines showed mucosal necrosis and the wall muscles of the transverse to sigmoid colon were necrotic. The sigmoid colon was fibrotic and infiltrated with numerous IgG4+ plasma cells and eosinophils; infiltration into Auerbach’s plexus was also observed. The IgG4-RD lesions were also detected in the mesentery of the sigmoid colon, retroperitoneal soft tissue, abdominal aorta, liver, extrahepatic bile duct, bilateral lungs, bilateral kidneys, urinary bladder, prostate, epicardium, bilateral coronary arteries, and lymph nodes. Interestingly, infiltration into the lesions was most notable around the peripheral nerves in every organ. Thus, this case describes an IgG4-RD that progressed from PTGC-type IgG4-related lymphadenopathy to systemic IgG4-RD, suggesting that IgG4-RD may affect many organs through peripheral nerve involvement. Virtual slide The virtual slides for this article can be found here: http://www.diagnosticpathology.diagnomx.eu/vs/9995992971155224.
    Diagnostic Pathology 02/2014; 9(1):41. DOI:10.1186/1746-1596-9-41 · 2.60 Impact Factor

  • Acta oto-laryngologica 01/2014; 134(4). DOI:10.3109/00016489.2013.871749 · 1.10 Impact Factor
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    ABSTRACT: IgG4-related disease is a systemic disorder with unique clinicopathological features and uncertain etiological features and is frequently related to allergic disease. T helper 2 and regulatory T-cell cytokines have been reported to be upregulated in the affected tissues; thus, the production of these cytokines by T helper 2 and regulatory T cells has been suggested as an important factor in the pathogenesis of IgG4-related disease. However, it is not yet clear which cells produce these cytokines in IgG4-related disease, and some aspects of the disorder cannot be completely explained by T-cell-related processes. To address this, we analyzed paraffin-embedded sections of tissues from nine cases of IgG4-related submandibular gland disease, five cases of submandibular sialolithiasis, and six cases of normal submandibular gland in order to identify potential key players in the pathogenesis of IgG4-related disease. Real-time polymerase chain reaction analysis confirmed the significant upregulation of interleukin (IL)4, IL10, and transforming growth factor beta 1 (TGFβ1) in IgG4-related disease. Interestingly, immunohistochemical studies indicated the presence of mast cells expressing these cytokines in diseased tissues. In addition, dual immunofluorescence assays identified cells that were double-positive for each cytokine and for KIT, which is expressed by mast cells. In contrast, the distribution of T cells did not correlate with cytokine distribution in affected tissues. We also found that the mast cells were strongly positive for IgE. This observation supports the hypothesis that mast cells are involved in IgG4-related disease, as mast cells are known to be closely related to allergic reactions and are activated in the presence of elevated non-specific IgE levels. In conclusion, our results indicate that mast cells produce T helper 2 and regulatory T-cell cytokines in tissues affected by IgG4-related disease and possibly have an important role in disease pathogenesis.
    Modern Pathology 01/2014; 27(8). DOI:10.1038/modpathol.2013.236 · 6.19 Impact Factor
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    ABSTRACT: The objective of this study was to delineate the frequency of delayed diagnosis in cases of subacute thyroiditis (SAT) and intervals between onset of clinical symptoms and appearance of abnormal laboratory findings. We reviewed the medical records of 27 patients (7 men and 20 women) with SAT who visited our hospital between 2007 and 2013. On presentation to the hospital, 5 of 27 SAT cases (18.5%) showed normal laboratory findings. Among these 5 cases, the mean interval between symptom onset and thyrotropin (TSH) suppression was 6.3 weeks, and the mean interval to elevation of fT4 was 6.7 weeks. The longest interval from symptom onset to appearance of an abnormal laboratory finding was 11 weeks. Sometimes time-lag exists between onset of clinical symptoms and the appearance of abnormal laboratory findings in patients with SAT. The possibility of this disease should not be excluded from the differential diagnoses for patients with clinical symptoms consistent with SAT but showing normal laboratory findings.
    Auris, nasus, larynx 12/2013; 41(4). DOI:10.1016/j.anl.2013.11.003 · 1.14 Impact Factor
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    ABSTRACT: ABSTRACT While the use of PCR-based clonality analysis of formalin-fixed paraffin embedded (FFPE) tissue has recently become widespread, the detection sensitivity for lymphoma subtypes using FFPE samples is not well known. Here, we analyzed T-cell receptor γ chain (TCRG) gene rearrangement clonality in 100 cases of T or NK/T cell lymphoma and examined detection sensitivity according to lymphoma subtypes. Clonality was detected in approximately 80% of the major T-cell lymphoma subtypes: peripheral T-cell lymphoma, not otherwise specified, 84% (21/25 cases); angioimmunoblastic T-cell lymphoma, 71% (15/21 cases); and adult T-cell leukemia/lymphoma, 80% (8/10 cases). The number of clonal peaks differed according to subtype. TCRG gene rearrangement was not detected in 63 cases of B-cell lymphoma or reactive lesions. Thus, clonality analysis can effectively and reliably detect TCRG gene rearrangement in T-cell lymphoma cases and could, therefore, be a useful diagnostic tool in routine practice.
    Leukemia & lymphoma 12/2013; 55(9). DOI:10.3109/10428194.2013.871634 · 2.89 Impact Factor
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    ABSTRACT: Conclusion: Cutting needle biopsy (CNB) combined with immunohistochemical study of myeloperoxidase (MPO) is a useful minimally invasive diagnostic procedure for histiocytic necrotizing lymphadenitis (HNL). Objectives: HNL is mainly diagnosed by pathological findings of open surgical biopsy (OSB) specimens. Recently the appearance of anti-MPO positive histiocytes has been reported as a highly specific pathological diagnosis for HNL. Considering the cosmetic impact and burden on the patients, we performed CNB combined with immunohistochemical study of MPO for the diagnosis of HNL. Few studies have reported the utility of this method in the diagnosis of HNL. Methods: A retrospective study was conducted using clinical data from 20 HNL patients. Results: CNB was performed in 8 patients and OSB in 13 (OSB after CNB in 1). MPO-positive histiocytes were observed in all of the 20 cases. The accuracy of the diagnoses was finally confirmed by the clinical courses in all cases.
    Acta oto-laryngologica 12/2013; 133(12):1328-1332. DOI:10.3109/00016489.2013.824112 · 1.10 Impact Factor
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    ABSTRACT: Conclusion: The characteristic ultrasound appearance of mucosa-associated lymphoid tissue (MALT) lymphoma of the head and neck provides diagnostic information regarding masses or swellings in the head and neck region. Objectives: There are only a few reports about ultrasound features of malignant lymphoma (ML) of the head and neck. We have noticed that the ultrasound appearances of cases with MALT lymphoma resembled each other even when the appearances of other images like computed tomography were absolutely different. The objective of this study was to delineate the reliability of this characteristic ultrasound appearance of MALT lymphoma of the head and neck. Methods: The ultrasound examinations of 30 patients with histopathologically proven primary ML of the head and neck (15 cases of MALT) were reviewed. The ultrasound results of each case were independently compared to the results of the histopathological examination. Results: Two ultrasound patterns were observed for MALT lymphoma. The first was characterized by a marked hypoechoic area with interspersed linear echogenic strands (linear echogenic strands pattern), and the second was characterized by multiple, relatively large, hypoechoic segments (segmental pattern). Histopathologically, these patterns could be explained on the basis of the expansion of lymphoma cells demarcated by narrow or wide fibrous bands.
    Acta oto-laryngologica 11/2013; 134(1). DOI:10.3109/00016489.2013.831994 · 1.10 Impact Factor
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    ABSTRACT: Mantle cell lymphoma (MCL) is a unique subtype of B-cell non-Hodgkin's lymphoma characterized by chromosomal translocation t(11;14)(q13;q32), positive CD5, and nuclear cyclin D1 overexpression with unfavorable prognosis. We report herein a case of MCL in a 73-year-old male diagnosed with diffuse large B-cell lymphoma (ileal tumor) at another hospital, who subsequently relapsed with CD5-negative MCL. At the 1st relapse, he developed neck lymph node swelling, of which biopsy showed proliferation of atypical large pleomorphic cells with CD5-negativity by both immunohistochemistry and flow cytometry. At the 2nd relapse, he again developed an ileal tumor, of which biopsy showed positivity for CD5, CD20, and cyclin D1. In MCL, CD5-negative expression has sometimes been reported as having pleomorphic and blastoid variants. The present case was also histologically the pleomorphic type, but the CD5 expression changed from negative at the onset and the 1st relapse to positive at the 2nd relapse. This is a rare and interesting case because of the different expression of CD5 at all stage. This phenomenon made the diagnosis of MCL difficult.
    Medical Molecular Morphology 10/2013; 47(3). DOI:10.1007/s00795-013-0060-x · 1.46 Impact Factor
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    ABSTRACT: Nestin is an intermediate filament that was first identified in neural progenitor cells. It is expressed in various cell types in the nervous system as well as in other systems. In the present study, we investigated nestin expression in non-neoplastic salivary gland tissue and in salivary gland tumors. In non-neoplastic salivary glands, nestin expression was observed in only a few abluminal cells. In contrast, diffuse nestin staining was observed in the abluminal cells of pleomorphic adenoma (11 of 11 cases), basal cell adenoma (7 of 7 cases), and epithelial-myoepithelial carcinoma (2 of 2 cases). The stromal cells in basal cell adenoma also expressed nestin. In adenoid cystic carcinoma (6 of 7 cases) and polymorphous low-grade adenocarcinoma (3 of 3 cases), nestin positive cells were observed focally. Nestin was not detected in Warthin tumor (6 cases), classical acinic cell carcinoma (2 cases), mucoepidermoid carcinoma (5 cases), or salivary duct carcinoma (4 cases). Because the nestin expression pattern in each histological salivary gland tumor type is unique, nestin could be a very useful abluminal cell marker for the diagnosis of salivary gland tumors.
    Pathology International 10/2013; 63(10):496-501. DOI:10.1111/pin.12103 · 1.69 Impact Factor
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    ABSTRACT: We present a case of a 67-year-old Japanese man with a serious oropharyngeal ulceration that at first seemed to be destructive malignant lymphoma or oropharyngeal carcinoma. We suspected methotrexate (MTX)-associated lymphoproliferative disorder (LPD) induced by MTX treatment for rheumatoid arthritis (RA). About 3 weeks after simple discontinuation of MTX, complete regression of the disease was observed, confirming our diagnosis.
    Acta medica Okayama 08/2013; 67(4):265-9. · 0.70 Impact Factor
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    ABSTRACT: Cervical tuberculous lymphadenitis is mainly diagnosed by analyzing tissue samples obtained by fine-needle aspiration (FNA). However, some cases remain diagnostic challenges even after polymerase chain reaction analysis of FNA specimens. To delineate differences between cases that are relatively easy to diagnose and those for which diagnosis is difficult, 22 patients with cervical tuberculous lymphadenitis were studied retrospectively. FNA tissues were used to diagnose 14 cases (group A), whereas excisional biopsy was required for accurate diagnosis of 8 cases (group B). These two groups were compared with regard to results of blood examinations, ultrasound appearance, and various other procedures required to reach the final diagnosis. The results indicated that diagnosis of cervical tuberculous lymphadenitis was more difficult for patients with lower white blood cell counts, lower serum C-reactive protein levels, and absence of lymph node fusion or abscess formation on ultrasonography. The possibility of tuberculosis as a cause of cervical lymphadenopathy should always be considered, even when the presenting symptoms are not typical of this disease.
    Journal of Infection and Chemotherapy 07/2013; 19(6). DOI:10.1007/s10156-013-0615-8 · 1.49 Impact Factor
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    ABSTRACT: Recently, atypical Castleman's disease (CD) was reported in Japan. This disease is considered as TAFRO syndrome or non-idiopathic plasmacytic lymphadenopathy (IPL), a constellation of clinical symptoms, namely, thrombocytopenia, anasarca, fever, reticulin fibrosis, and organomegaly without hyper-γ-globulinemia. Histopathologically, this disease is similar to hyaline vascular (HV)-type CD. Here, we present a 43-year-old Japanese woman meeting the clinical criteria of TAFRO syndrome who was successfully treated with combined corticosteroid therapy. She showed a rapidly progressive course of thrombocytopenia, systemic lymphadenopathy, fever, anasarca, and increase in acute inflammatory proteins without hyper-γ-globulinemia. Lymph node biopsy was performed and revealed HV-type CD without human herpes virus 8 infection, which was clinicopathologically compatible with non-IPL. The association of these atypical features with well-known multicentric Castleman's disease (MCD), namely, HV-type histology with systemic lymphadenopathy, marked thrombocytopenia even with a high level of interleukin-6, and increased acute inflammatory proteins without hyper-γ-globulinemia, suggests that TAFRO syndrome as presented in our case is a novel entity, which may have been diagnosed as MCD in the past. To define this novel entity more clearly and to demonstrate its etiology, further nationwide surveys of this syndrome and MCD are needed. [J Clin Exp Hematopathol 53(1) : 87-93, 2013].
    Journal of Clinical and Experimental Hematopathology 06/2013; 53(1):87-93. DOI:10.3960/jslrt.53.87
  • Koh-Ichi Ohshima · Yasuharu Sato · Tadashi Yoshino ·
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    ABSTRACT: There are no reports on the effect of anti-allergic agents against IgG4-related disease. We herein report a case of IgG4-related dacryoadenitis that is believed to have regressed due to the administration of anti-allergic agents. A 57-year-old woman consulted us because of bilateral temporal upper eyelid swelling and induration. She had also been suffering from allergic rhinitis and allergic conjunctivitis for 20 years. We performed an incisional biopsy of the lesion. With respect to the pathology, extranodal marginal zone lymphoma of mucosa-associated lymphoid tissue type was strongly suspected. On obtaining consent from the patient, follow-up alone was to be continued without radiation therapy. In addition to the observation of lacrimal gland lesions, the administration of epinastine hydrochloride at a dosage of 20 mg/day and 0.01% betamethasone eye drops twice a day to both eyes was commenced in order to treat both allergic rhinitis and allergic conjunctivitis. The lacrimal gland lesion decreased in size over time, becoming predominantly normal 7 years after the commencement of agent administration. We therefore re-examined the blood and pathology specimens. As a result, the serum IgG4 level was found to have increased to 540 mg/dl, while IgG4/IgG was 36.2%. The pathological diagnosis was revised to IgG4-related dacryoadenitis. The hypotheses of spontaneous remission and/or the effect of epinastine hydrochloride administration can be proposed regarding the mechanism by which the lacrimal gland lesion decreased in size. [J Clin Exp Hematop 53(1): 53-56, 2013].
    Journal of Clinical and Experimental Hematopathology 06/2013; 53(1):53-56. DOI:10.3960/jslrt.53.53
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    ABSTRACT: Ocular adnexal lymphoma may involve the eyelids, conjunctiva, orbital tissue, or lacrimal structures. The majority are non-Hodgkin's B-cell lymphomas of mucosa-associated lymphoid tissue (MALT) lymphoma type. Follicular lymphomas represent a small percentage of ocular adnexa lymphomas, particularly in Japan. We report a 68-year-old female patient who presented with a salmon pink patch-like lesion of the left conjunctiva, suspected of being (MALT) lymphoma. However, histologic and immunohistologic examinations were consistent with follicular lymphoma. This case demonstrates the importance of considering such rare lymphomas when making a diagnosis of ocular adnexal lymphoid neoplasms. [J Clin Exp Hematop 53(1): 49-52, 2013].
    Journal of Clinical and Experimental Hematopathology 06/2013; 53(1):49-52. DOI:10.3960/jslrt.53.49

Publication Stats

2k Citations
249.62 Total Impact Points


  • 2008-2015
    • Okayama University
      • • Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences
      • • Department of Pathology and Oncology
      Okayama, Okayama, Japan
  • 2014
    • Osaka City University
      Ōsaka, Ōsaka, Japan
  • 2012
    • Nagoya University
      • Clinical Laboratory
      Nagoya, Aichi, Japan