2022 Volume 58 Issue 2 Pages 194-200
A female patient had a tumor with a constriction on the left side of the perineum since birth, which appeared to have a similar surface to that of the surrounding skin. The tumor was not detected antenatally. Magnetic resonance imaging (MRI) at one month of age confirmed that the tumor measured 1.5 cm in diameter, and a bone-like nodule measuring 0.5 cm in diameter was identified at the depth of the tumor. The tumor did not invade the anal sphincter or levator ani muscles. Further evaluation did not reveal spina bifida occulta, anorectal malformations, or genitourinary malformations. We planned tumor excision after the patient had gained adequate weight to undergo surgery. The patient underwent tumor resection, and the tumor and deep nodule were removed at nine months of age. Histopathological evaluation of the resected specimen confirmed that the tumor was a lipoma, and the deep nodules were cartilage and osseous components. During the operation, a continuity between the tumor and the deep nodule was observed macroscopically. It was suspected that the lipoma contained the nodule. Congenital perineal lipoma is a rare disease that may occur in combination with various malformations and may contain cartilage and osseous tissue, as observed in our case. Preoperative MRI evaluation is important to confirm tumor characteristics, the presence of other tissues such as cartilage and bone, and combined malformations, if any.
