title: Pathologic, cytologic and immunohistochemical findings of an intra-abdominal desmoplastic small round cell tumor in a 15-year-old male.
abstract: The intra-abdominal desmoplastic small round cell tumor is a rare neoplasm. It usually occurs in young males and diffusely involves the peritoneum and pursues an aggressive clinical course. The present patient was a 15-year-old male who experienced abdominal pain and abdominal swelling. The patient was diagnosed with an intestinal myogenic sarcoma, and surgery for tumor resection was performed in June 1999. The tumor was a 20 x 15 x 15 cm well-defined mass in the peritoneum involving the transverse colon and stomach with peritoneal disseminations and splenic metastasis. Microscopic findings were well-defined nests composed of small round cells and separated by abundant desmoplastic stroma. Cytologically, the tumor cells consisted of small, round to oval cells with a scant amount of light blue cytoplasm. Immunohistochemically, the tumor cells were positive for anti-epithelial membrane antigen, vimentin, desmin, neuron-specific enolase and WT1 protein antibodies. Similar pathologic features with other small round cell tumors may lead to differential diagnostic difficulties that require the application of ancillary diagnostic methods, such as immunohistochemistry and cytogenetic techniques.
authors.affiliation: Department of Pathology, Yokosuka Municipal Hospital,Yokosuka City, Kanagawa 240-0195, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Takekawa
authors.forename: W
authors.initials: W
authors.lastname: Ugajin
authors.forename: H
authors.initials: H
authors.lastname: Koide
authors.forename: S
authors.initials: S
authors.lastname: Nishio
authors.forename: T
authors.initials: T
authors.lastname: Yamamoto
authors.forename: T
authors.initials: T
authors.lastname: Sawada
mesh_terms: D000071443:12E7 Antigen; D000008:Abdominal Neoplasms / Q000378:metabolism / Q000473:pathology* / Q000601:surgery; D000293:Adolescent; D015703:Antigens, CD / Q000378:metabolism; D014408:Biomarkers, Tumor / Q000378:metabolism; D015815:Cell Adhesion Molecules / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000378:metabolism; D003893:Desmin / Q000378:metabolism; D018222:Desmoid Tumors / Q000378:metabolism / Q000473:pathology* / Q000601:surgery; D006801:Humans; D007124:Immunoenzyme Techniques; D008297:Male; D009362:Neoplasm Metastasis; D014157:Transcription Factors / Q000378:metabolism; D025721:WT1 Proteins
chemical_list: D000071443:12E7 Antigen; D015703:Antigens, CD; D014408:Biomarkers, Tumor; C061828:CD99 protein, human; D015815:Cell Adhesion Molecules; D004268:DNA-Binding Proteins; D003893:Desmin; D014157:Transcription Factors; D025721:WT1 Proteins