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Int J Clin Exp Pathol 2013;6(4):795-797

Case Report
Sarcomatoid carcinoma in the pelvic cavity

Tadashi Terada

Departments of Pathology, Shizuoka City Shimizu Hospital, Shizuoka, Japan

Received September 22, 2012; Accepted January 21, 2013; Epub March 15, 2013; Published April 1, 2013

Abstract: Sarcomatoid carcinoma in the pelvic cavity is very rare. A 58-year-old Japanese man was admitted to our hospital because of lower
abdominal fullness. CT and MRI revealed a large mass in the left pelvic cavity. Transurethral bladder endoscopy showed tumor invasion, and
large biopsies were obtained from the bladder lesion. Histologically, the tumor was composed of malignant round cells with hyperchromatic
nuclei. Many intracytoplasmic vacuoles were present. No carcinomatous areas were seen. Immunohistochemically, the tumor cells were
positive for cytokeratin (CK) 18, vimentin, p53 and Ki-67 (labeling 80%). The tumor cells were negative for panCK AE1/3, CD5/6, CK7, CK8,
CK14, CK19, CK20, CK 34BE12, EMA, desmin, calretinin, WT-1, S100 protein, α-smooth muscle actin, CEA, CD34, CD45, CD20, factor VIII-
related antigen, synaptophysin, p63, CDX2, and myoglobin. Because the CK18 was diffusely expressed, the pathological diagnosis was
sarcomatoid carcinoma. (IJCEP1209023).

Keywords: Sarcomatoid carcinoma, pelvic cavity, urinary bladder

Address correspondence to: Dr. Tadashi Terada, Department of Pathology, Shizuoka City Shimizu Hospital, Miyakami 1231 Shimizu-Ku, Shi-
zuoka 424-8636, Japan. Tel: +81-54-336-1111; Fax: +81-54-334-1173; E-mail: piyo0111jp@yahoo.co.jp