1Department of Surgery, Mitsubishi Kobe Hospital, 2Department of Urology, Mitsubishi Kobe Hospital
Leiomyosarcoma, Small intestine , Ultrasonography
A leiomyosarcoma of the small intestine was discovered behind the urinary bladder on ultrasonographic (US) examination.
The patient was 49-year-old man with dysuria. Routine laboratory studies indicated leukocytosis, but there were no other
abnormal findings. A soft mass was palpable through the rectal wall by digital examination. US showed a well-circumscribed,
round, cystic lesion that measured 8 X 7 cm. The lesion was predominantly hypoechoic. Dilatation of the small intestine on the
side anterior to the lesion was also identified. The pelvic computed tomogram (CT) showed a marginally enhanced low-density
mass that contained an air-density spot, and surgery was performed. The tumor, located between the urinary bladder and the
rectum, was a cystic mass containing necrotic tissue, and it originated from the small intestine. Histologic examination
identified it as a leiomyosarcoma of the small intestine, a rare disease. The nonspecificity of the symptoms and difficulty of
preoperative examination complicate the diagnosis. This report suggests the potential value of US findings in cases of
leiomyosarcoma of the small intestine.