Shigetoshi Matsuo

Nagasaki University, Nagasaki-shi, Nagasaki-ken, Japan

Are you Shigetoshi Matsuo?

Claim your profile

Publications (47)41.75 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: Intrahepatic cholangiocarcinoma is macroscopically classified into three subtypes, mass-forming-type, periductal infiltrating-type, and intraductal growth-type. Each subtype should be preoperatively differentiated to perform the valid surgical resection. Recent researches have revealed the clinical, radiologic, pathobiological characteristics of each subtype. We reviewed recently published studies covering various aspects of intrahepatic cholangiocarcinoma (ICC), focusing especially on the macroscopic subtypes and stem cell features to better understand the pathophysiology of ICC and to establish the valid therapeutic strategy.
    World journal of gastrointestinal pathophysiology. 08/2014; 5(3):188-99.
  • [Show abstract] [Hide abstract]
    ABSTRACT: We herein present a case of hepatic cysts causing obstructive jaundice that was treated with single-incision laparoscopic deroofing. A 72-year-old female patient was referred to hospital due to a large hepatic cyst that compressed the intrahepatic bile ducts. The patient was scheduled to undergo single-incision laparoscopic deroofing. The EZ ACCESS(TM) oval type (Hakko Co. Ltd.) was placed at the umbilicus using a 25-mm incision with two 5-mm trocars. An additional 12-mm port was placed at the left epigastric region. We unroofed and excised the cyst wall using a vessel sealing system in liver segment 4. After surgery, the patient was found to be asymptomatic. The unroofed cysts were completely diminished. Notably, the remnant liver had fairly regenerated. The estimated regeneration volume of the normal liver was 153 cm(3). To prevent surgical complications, clinicians should perform adequate management and use of devices. To prevent postoperative recurrence of cysts, performing complete deroofing is essential. Single-incision laparoscopic deroofing contributes to improving the quality of life of patients and should be considered a standard treatment.
    Case Reports in Gastroenterology 09/2013; 7(3):503-10.
  • [Show abstract] [Hide abstract]
    ABSTRACT: Almost all mammary lesions are detected by a mammography and an ultrasound. However, a small part of lesions cannot be shown by only a magnetic resonance imaging (MRI). MRI-guided vacuum-assisted breast biopsy is a very useful means for the pathological diagnosis of these lesions. We performed MRI-guided vacuum-assisted breast biopsy to 4 patients with the lesions seen only by MRI. Biopsies were safely and easily performed using biopsy software (syngo BreVis). These biopsied specimens resulted cancer in 1, adenoma in 1 and benign lesions in 2. With an increase of the opportunity of MRI for the mammary lesions, we expect these lesions become increasingly large. We believe that MRI-guided vacuum-assisted breast biopsy will be an important diagnostic modality.
    Nippon Hoshasen Gijutsu Gakkai zasshi 01/2013; 69(1):80-4.
  • [Show abstract] [Hide abstract]
    ABSTRACT: Although combination therapy consisting of 5-fluorouracil (5-FU) and cisplatin for the treatment of gastric cancer has been reported, no consistent regimen has been established. Our aim was to determine the optimal treatment schedule of this therapy, for patients with advanced or recurrent gastric cancer. We conducted a phase II study to evaluate the efficacy and safety of combination therapy consisting of intermittent 5-FU and low-dose cisplatin in 26 patients with advanced or recurrent gastric cancer. The treatment cycle consisted of intravenous cisplatin at 3.3 mg/m(2)/day for 5 consecutive days. 5-FU was administered as a continuous intravenous infusion at 300-500 mg/body every other day (days 1, 3, 5) for 4 weeks. The partial response rate was 34.6%. The median survival duration was 12.8 months and the one-year survival was 53.1%. There were a few adverse effects. Our results suggest that this mode of combination therapy led to a fairly favorable outcome for patients with advanced or recurrent gastric cancer.
    Anticancer research 08/2012; 32(8):3495-9. · 1.71 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: An 85-year-old male with advanced squamous cell carcinoma of the lung, who was diagnosed about 10 years prior to his current presentation, suddenly complained of abdominal pain and underwent an abdominal computed tomography scan, which revealed free air and massive ascites. He was admitted to our hospital for acute peritonitis and emergency surgery was performed. During the surgical procedure, a perforation of the jejunum was diagnosed and repaired. He was diagnosed to have a metastatic tumor originating from a squamous cell carcinoma of the lung. He improved and was transferred to the former hospital on the 27th postoperative day. Jejunal metastasis from squamous cell carcinoma of the lung is rare, and the prognosis of peritonitis due to a perforated intestinal metastasis from lung cancer is poor. There have been 10 reports of jejunal metastasis of squamous cell carcinoma of the lung reported in Japan between 2000 and 2011. Therefore, when patients with advanced lung cancer present with acute abdomen, it is necessary to keep in mind the possibility of a gastrointestinal metastatic tumor.
    Case Reports in Gastroenterology 09/2011; 5(3):636-41.
  • [Show abstract] [Hide abstract]
    ABSTRACT: Parenchymal leiomyomas of the breast are extremely rare, with only 25 cases reported in the literature. We report the 26th case of parenchymal leiomyoma of the breast in a 63-year-old woman who presented to us with a right breast tumor detected on her screening mammography. This tumor was evaluated by mammography, ultrasonography, and MR imaging. To the best of our knowledge, this is the first case of a parenchymal leiomyoma of the breast examined by MR imaging. MR imaging revealed an oval mass with circumscribed margins that appeared as a high-intensity lesion in both T1 and T2. A dynamic MRI study showed a gradual increase pattern on the mass. Excisional biopsy revealed a growth pattern of interlacing fascicles of spindle cells without atypia or mitoses, consistent with parenchymal leiomyoma of the breast. Here we report a case of parenchymal leiomyoma of the breast, and describe the clinical, pathological, and immunohistochemical findings. In addition, we review the literature on parenchymal leiomyoma of the breast with regard to clinical characteristics and pathological features of this entity.
    Breast Cancer 03/2011; 18(3):231-6. · 1.33 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: We treated a 69-year-old male with a 16-mm polyp of the gallbladder. Enhanced computed tomography demonstrated marked enhancement. With a tentative diagnosis of early polypoid cancer of the gallbladder, open cholecystectomy was performed. Intraoperative ultrasound showed hyperechoic spots on the surface of the polyp with an inner echopenic area. The histological diagnosis was an inflammatory polyp that manifested nonneoplastic, edematous stroma, and infiltration of lymphcytes and plasmacytes.
    Case Reports in Gastroenterology 01/2009; 3(2):255-259.
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: A 69-year-old man was admitted to our hospital with loss of appetite, constipation and diarrhea. Upper gastrointestinal barium study and endoscopy revealed a Borrmann type III-like gastric cancer. Biopsy specimens showed poorly differentiated adenocarcinoma. Total gastrectomy with lymph nodes dissection was performed. The tumor histologically consisted of diffuse proliferation of large and round cells presenting as an organoid, trabecular or sheet-like structure accompanied by a small amount of multinuclear giant cells. The tumor cells were histochemically positive for Grimelius stain and were immunohistochemically, extensively and diffusely positive for chromogranin A. These findings led us to a diagnosis of large cell neuroendocrine carcinoma (LCNEC). This entity of the stomach is not clearly recognized at present. Clinicopathological characteristics of LCNEC of the stomach must be defined so that an appropriate treatment can be developed
    01/2008;
  • [Show abstract] [Hide abstract]
    ABSTRACT: Computed tomography revealed a well-enhanced omental mass. Magnetic resonance imaging demonstrated a mass with low signal intensity on T1-weighted images (WI) and high signal intensity on T2-WI. Resected specimens immunohistochemically showed positive results for alpha-smooth muscle actin, muscle-specific actin (HHF35) and vimentin, and negative results for S-100 protein, CD34, desmin, EMA, keratin, calretinin, HBME1, and c-kit. This is the first case of an omental glomus tumor reported in the English literature.
    Journal of Surgical Oncology 01/2008; 96(7):633-6. · 2.64 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Obturator hernia is an important cause of small bowel obstruction and is associated with difficult diagnosis and high mortality. We reviewed 22 cases of intestinal obstruction due to obturator hernia that necessitated surgical intervention over the last 17 years and evaluated the changes in the number of patients based on the census data. All cases were elderly females. The Howship-Romberg sign was present in 15 patients (68%). Computed tomography (CT) correctly diagnosed 13/15 (87%) of cases in which it was performed prospectively. The median time to surgery was 7.5+/-5.2 days for those patients with bowel resection, compared to 0.8+/-1.3 days for those without (P <0.05). The number of patients with obturator hernia has increased with an ageing society. The rising incidence of obturator hernia is probably linked to an ageing society. CT of the pelvis was helpful in obtaining the correct diagnosis. The shorter the delay between admission and surgery, the lower the bowel resection rate. Laparotomy at an early stage is recommended in such patients as it leads to reduced morbidity and mortality.
    Annals of the Academy of Medicine, Singapore 06/2007; 36(6):413-5. · 1.36 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: We described a 75-year-old female with recurrent breast cancer that presented as stenosis of the ascending colon and right hydronephrosis. The patient underwent a left mastectomy for breast cancer and a right mastectomy for metachronous breast cancer at the ages of 45 and 69, respectively. Histological findings showed primary invasive ductal carcinoma (scirrhous carcinoma). At the age of 73, she suffered from right hydronephrosis, which was suspected to have been caused by metastasis to the ureter. Two years later, stenosis of the ascending colon occurred. Right hemicolectomy and partial resection of the ureter were performed. Resected specimens revealed infiltration of tumor cells in all layers of the colon and the ureter which resembled invasive ductal carcinoma of primary breast cancer. Metastatic breast cancer can manifest itself in a variety of recurrences, including ureteral and colonic metastatic sites
    01/2007;
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: A 48-year-old woman was admitted to our hospital with abdominal fullness and pain. A barium enema and endoscopy revealed a Borrmann type II-like tumor of the sigmoid colon. Biopsy specimens showed poorly differentiated adenocarcinoma. Sigmoidectomy with lymph nodes dissection was performed. The tumor histologically consisted of proliferation of large and polygonal cells showing an organoid, trabecular or rosette-like pattern. Many mitotic figures were also observed. The tumor cells were immunohistochemically positive for chromogranin A. These findings led us to a diagnosis of large cell neuroendocrine carcinoma (LCNEC). Six months after surgery, liver metastases, para-aortic lymph node metastases and local recurrence were identified, and we commenced to administer FOLFOX, a combination of l-leucovorin and 5-fluorouracil with oxaliplatin. After six courses, a partial response was observed. This entity of the colon is not clearly recognized at present. The clinicopathological characteristics of LCNEC of the colon must be defined so that an appropriate treatment can be developed. Since LCNEC of the lung has been reported to be of high-grade malignancy, LCNEC of the colon must be treated as potentially highly malignant. In addition, the present case suggested that FOLFOX is a promising treatment for LCNEC of the colon
    01/2007;
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: We herein present a case of a 75-year-old female with mucosa-associated lymphoid tissue (MALT) lymphoma of the transverse colon with the stage IE (Ann Arbor classification). Colonoscopy revealed the tumor's appearance as a IIa plus II c-like early colon cancer as defined according to the macroscopic classification of the Japanese Research Society for Cancer of Colon, Rectum and Anus, measuring less than 2 cm in diameter. Histologically, the tumor was diagnosed as MALT lymphoma because of the presence of lymphoepithelial lesions consisting of diffuse proliferation of atypical lymphocytes and glandular destruction. The majority of these lymphocytes immunohistochemically stained for the B-lymphocyte marker. The patient first underwent H pylori eradication therapy with Lansap. However, the tumor size gradually increased over the next 4 mo and the patient eventually underwent surgical resection. The operative procedure included a partial colectomy with dissection of the paracolic lymph nodes. The tumor measured 45 mm multiply 30 mm in diameter and histological examination showed that the lymphoma cells had infiltrated the muscle layer of the colon without nodal involvement. The patient has had no recurrence postoperatively without any chemotherapy.
    World Journal of Gastroenterology 10/2006; 12(34):5573-6. · 2.55 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Small bowel stenosis is a serious complication of intestinal anisakiosis. The aim of this report is to investigate whether severe stenosis of the small intestine can be conservatively managed. We treated two patients with severe stenosis of the small intestine caused by anisakiosis. Surgical intervention was eventually performed on the 23rd and 35th in the hospital, respectively. Histopathological examination of the resected specimens revealed that the intestinal wall had been completely damaged by the inflammatory reaction of anisakiosis, and that the damage was irreversible, thereby suggesting that laparotomy is needed in cases of severe small bowel stenosis caused by intestinal anisakiosis, even if a long period of conservative treatment for the intestinal anisakiosis allowed the patient to pass successfully through the acute phase.
    World Journal of Gastroenterology 08/2006; 12(25):4106-8. · 2.55 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: We herein present two cases of solitary fibrous tumor (SFT) of the pleura. In case 1, a 66-year-old female was admitted with a nodule in the left lung field gradually inceasing in size for a period of two years. During video-assisted thoracoscopic surgery (VATS), the tumor showed a pedunculated tumor arised from the visceral pleura. Resected specimens were diagnosed to be SFT of the pleura with a malignant potential. In case 2, a 69-year-old female was admitted with a mass lesion in the left lower lung field. MRI showed a tumor with very low signal intensity on T2 weighted images, which was compatible with SFT of the pleura. During VATS, the tumor adhered to the parietal pleura with some fibrous bands but was easily removed. Resected specimens were diagnosed to be a benign SFT of the pleura. MRI was considered to be a helpful modality for the preoperative diagnosis of SFT
    01/2004;
  • Journal of Clinical Gastroenterology 01/2004; 38(10):915-6. · 3.20 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Large gastric trichobezoars usually are difficult to remove gastroscopically without gradual fragmentation. Surgical retrieval of trichobezoars may be recommended, which requires laparotomy and gastrotomy. The authors report a case in which an 11-year-old girl with a trichobezoar underwent successful removal using gastroscopy with laparoscopically assisted fragmentation.
    Journal of Pediatric Surgery 03/2003; 38(2):e7. · 1.38 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Gastric necrosis is a rare and often fatal condition. A few reports of gastric necrosis of various etiologies have been published in the literature. This report deals with a case in which gastric necrosis and perforation occurred several years after an infarction of the spleen. Preoperative computed tomography showed the existence of splenic vein thrombosis accompanying splenic infarction. A laparotomy revealed an 8-cm-long laceration with ragged margins in the posterior of the stomach along the greater curvature. Furthermore, massive venous thrombosis was found in the major omentum. As a result, the reduced arterial blood supply and insufficient venous drainage due to splenic venous thrombosis may have together played a major role in the development of gastric necrosis.
    Surgery Today 02/2003; 33(11):867-9. · 0.96 Impact Factor
  • Journal of Clinical Gastroenterology 08/2002; 35(1):107-9. · 3.20 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: We herein present two cases of a colorectal perforation due to uncommon reasons. First, we treated a 45-year-old woman for a stercoral perforation of the sigmoid colon. The pathognomonic etiology was a barium fecaloma originating from an upper gastrointestinal series 9 months before admission. The second case was a 46-year-old woman who was admitted with a perforation of the transverse colon. She had experienced perforations of the sigmoid colon at 32 years of age and of the rectum at 44 years of age, respectively. The second and third conditions were diagnosed to be idiopathic, and were histologically proven by an abrupt obliteration and a thinness of the colonic wall with some infiltration of inflammatory cells. The first condition, however, was most likely a stercoral perforation. The postoperative course of these patients was uneventful, and both are doing well at this writing.
    Surgery Today 02/2002; 32(9):836-9. · 0.96 Impact Factor