Benign clear (sugar) cell tumor of the lung with CD1a expression

Department of Microbiology and Pathology, Tottori University, and Department of General Thoracic Surgery, Tottori University Hospital, Yonago, Japan.
Pathology International (Impact Factor: 1.69). 09/2006; 56(8):453-6. DOI: 10.1111/j.1440-1827.2006.01988.x
Source: PubMed


Reported herein is a case of benign clear cell tumor of the lung in a 60-year-old man. Chest X-ray and CT examination revealed an abnormal nodule with homogenous density and a clear margin in the lower lobe of the left lung. The resected tumor was 13 mm in size, well-circumscribed and was graysh-white on cut surface. Histological examination showed a diffuse growth pattern of polygonal tumor cells with indented and pleomorphic nuclei, and clear abundant cytoplasm with a distinct cell border surrounded by thin-walled vascular spaces and sinusoid-type vessels. The clear cytoplasm contained numerous glycogen granules as demonstrated by PAS staining. In the present case there was focal immunoreactivity for S-100 protein, HMB-45, neuron-specific enolase, cathepsin B and melan A, which are consistent with reported immunohistochemical staining patterns of benign clear cell tumor. Based on these findings, the tumor was diagnosed as a benign clear cell tumor of the lung. Although most clear cell tumors are considered to belong to the family of neoplasms with perivascular epithelioid cell differentiation (PEComas), histogenesis of benign clear cell tumor of the lung has remained unclear. This first report of CD1a expression in this tumor might provide a new insight into its histogenesis and diagnosis.

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    • "Since that time, fewer than 60 cases have been reported in the English literature. CCTL can occur in any age group (range 8 to 73 years), with equal sex prevalence [7,8,10,16,17,23,25,26] or a slight female predominance [4,9,14,24,28]. However, in our study, males were slightly more prone to CCTL than females (29/27). "
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    ABSTRACT: Clear cell tumor of the lung is a rare and benign pulmonary tumor; only sporadic cases have been reported. Here, we report the case of a 38-year-old man with recurrent cough, blood-streaked sputum and left chest pain. A chest computed tomography scan showed a round, homogeneous pulmonary mass in the left lower lobe, which exhibited intense heterogeneous enhancement in the arterial phase and homogeneous in the delay phase after injecting a contrast agent. The patient underwent a fine-needle aspiration biopsy and was diagnosed as having a benign clear cell tumor of the lung. The clinical presentation and radiographic investigation of this tumor are summarized in this paper to recognize this rare disease. Interestingly, we found some differences with previously reported cases.
    Full-text · Article · Oct 2013 · World Journal of Surgical Oncology
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    • "Rates of immunohistochemical positivity for clear cell tumor in previous studies [2] [3] [4] [5] [6] [8] [10] [13] [15] [19] [21] Marker Number of positive cases/ "
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    ABSTRACT: Background The clear cell “sugar“ tumor of the lung is an extremely rare benign mesenchymal tumor. Aim: To report a case of the sugar tumor and discuss diagnostic differentiation of the tumor. Case report A 53-year female presented with persisting cough. A CT scan revealed a round, 10 mm nodule located within the right lower lobe. The nodule was easily removed during thoracotomy. On the gross examination, the tumor was well circumscribed, and had a homogenous grayish-white appearance on the cut surface. The tumor consisted of round and oval cells with abundant clear cytoplasm, showing PAS pozitive abundant glycogen granules, which were removed by diastase pre-treatment before further staining with PAS. Immunohistochemical studies revealed the tumor cells were positive for HMB-45, vimentin, S-100 protein and very few cells for CD-117. The tumor cells were negative for αSMA, CK-7, AE1/AE3, CD-10, chromogranin and TTF-1. Conclusion Based on the clinical, pathohistological and immunohistochemical data, the diagnosis of the primary clear cell sugar tumor of the lung was established.
    Full-text · Article · Feb 2012 · Central European Journal of Medicine
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    ABSTRACT: PEComa (clear cell "sugar" tumor) of the lung is a rare benign tumor of the lung probably arising from the perivascular epithelioid cells (PECs). We report a case of pulmonary PEComa arising from the periphery of the right lobe of a 64-year-old male. To our knowledge, this is the second case in the English literature diagnosed by fine needle aspiration biopsy. In this case report, the clinical, cytologic and immunohistochemical features clear cell "sugar" tumor of the lung are discussed and compared with the previously published literature. The differential diagnosis and methods for distinguishing the various clear cells lesions in the lung are discussed.
    No preview · Article · Feb 2008 · Diagnostic Cytopathology
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