Intraabdominal heterotopic ossification after appendectomy mimicking undescended testicular tumor: A rare case report and literature review

Intraabdominal heterotopic ossification is a rare sequela of abdominal surgery or trauma. Only a few previous reports have been described in the literature. Here, we report the case of a 20-year-old man who underwent appendectomy 3 years ago and experinced this condition. Initially, he presented with right undescended testis with a palpable mass in the right lower abdomen. Plain radiography and computed tomographic imaging showed peripheral calcified soft tissue mass. Explorative laparotomy for excision was performed and heterotopic ossification was diagnosed by pathologic findings. The characteristic imaging features of this rare entity are discussed and the literature are reviewed.