Open AccessTubular Adenoma of the Gallbladder with Squamoid Spindle Cell Metaplasia:Report of Three Cases with Immunohistochemical Study
Author(s) -
Nishihara Kazuyoshi,
Yamaguchi Koji,
Hashimoto Hiroshi,
Enjoji Munetomo
Publication year - 1991
Publication title -
acta patholigica japonica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.73
H-Index - 74
ISSN - 0001-6632
DOI - 10.1111/j.1440-1827.1991.tb03270.x
Subject(s) - immunohistochemistry , gallbladder , pathology , metaplasia , adenoma , medicine , anatomy
Three cases of tubular adenoma of the gallbladder with squamoid spindle cell metaplasia are reported. Two of the three patients, who were middle‐aged Japanese, had a solitary polyp in the gallbladder, and the other had three polyps. All the lesions were detected incidentally by ultrasonography. The polyps were pedunculated with a fine or frail stalk, and ranged from 0.5 to 3.9 cm in diameter. Histologically, they were tubular adenomas accompanied by scattered foci composed of a compact collection of short‐spindle or oval cells with mild atypia. These cells did not retain intercellular bridges, and lacked intracellular keratinization. Immunohistochemically, the spindle cells stained positively for high‐molecular‐weight cytokeratin (EAB 903, a marker of squamous cell differentiation), whereas adenoma cells lining the tubules were negative for this antigen. Therefore, the spindle cell component is considered to represent squamoid metaplasia of adenoma cells. Acta Pathol Jpn 41: 41–45, 1991.