1. Combined adenomatoid tumor and well differentiated papillary mesothelioma of the omentum
- Author
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Yuichiro Hatano, Hisataka Moriwaki, Shinji Osada, Kazuhiro Yoshida, Akira Hara, Kengo Matsunaga, Yoshinobu Hirose, Ichiro Yasuda, and Yusuke Kito
- Subjects
Cuboidal Cell ,Pathology ,medicine.medical_specialty ,biology ,business.industry ,Adenomatoid tumor ,Vimentin ,General Medicine ,Anatomy ,medicine.disease ,Pathology and Forensic Medicine ,Cytokeratin ,medicine.anatomical_structure ,biology.protein ,Medicine ,Desmin ,Calretinin ,business ,Pancreas ,Epithelioid cell - Abstract
Herein is reported a highly rare case of combined adenomatoid tumor and well differentiated papillary mesothelioma of the omentum. A 45-year-old Japanese man was incidentally found to have a mesenteric mass during abdominal ultrasonography. Grossly, a well-circumscribed and non-encapsulated tumor, measuring 24 × 23 × 22 mm, was located in the omentum with no obvious invasion to the surrounding stomach and pancreas. Microscopically, the tumor consisted of two histological distinct components; the majority of it showed irregular arrangement of numerous cysts lined by a single layer of flattened or epithelioid cells and the multifocal minor component exhibited prominent papillary protrusions lined by a single layer of cuboidal cells with relatively uniform nucleus. Immunohistochemically, the tumor cells were diffusely positive for cytokeratin (AE1/AE3), vimentin, calretinin, D2-40 and WT-1, and negative for epithelial membrane antigen (EMA), desmin, S-100 protein and CD68. Ki-67 labeling index of the tumor cells was
- Published
- 2011