2016 Volume 52 Issue 5 Pages 1056-1060
Perianal lipoma is an uncommon anomaly. We report a case of lipoma that was found as a perianal tumor. A 21-day-old infant presenting with a perianal tumor was introduced to our hospital. The tumor’s color changed to dark red on day 20 after birth. The tumor was like a pedunculated polyp and arose from the anal skin. The head of the tumor appeared to have hemorrhaged internally and turned dark red. Ultrasonography showed that the inside of the tumor consists of adipose tissue. The tumor showed no communications with the rectum or sacrum, and no anorectal malformations were found. Tumor extirpation was performed at 25 days of age. Histopathologic findings indicated lipoma. No recurrence was observed 6 months after the operation. Perianal tumors include lipoma, human tail, sacrococcygeal teratoma, hemangioma, lipoblastoma, and other anomalies, and they require histopathological analysis for differential diagnosis. It is important to examine the positions of the rectum, anal sphincter, and spinal cord during operation. In this patient, the examination before the operation revealed no communications of the tumor with any of the above-mentioned structures, and thus we performed the operation early.
