Heart-shaped pedunculated lipofibroma of the coccygeal area in a neonate
A 3-day-old male neonate was referred to Department of Pediatric Surgery, Seoul National University Children's Hospital with a mass on the coccygeal area. The neonate was delivered via normal spontaneous vaginal delivery with 37 weeks gestation, as the second of twins, and measured a weight of 1,810 gm with normal Apgar scores. Physical examination revealed a 1.5 × 1.8 cm sized soft, flesh-colored, heart-shaped mass with a smooth surface. The mass showed a pedunculated shape and was connected to the skin and subcutaneous tissue of coccygeal area by a stalk (). Ultrasonography and magnetic resonance imaging showed the hyper-echoic soft tissue mass was not communicating with the spinal cord. The mass was excised with ligation of the feeding vessel, which was surrounded with fibrous tissue at the core of the stalk. The pathologic exam was compatible with pedunculated lipofibroma. There were many collections of mature adipose cells trapped between bundles of collagen in the dermis with no evidence of accompanying melanocytes ()