Heterotopic bone formation in a lower transrectal abdominal incision.

One case of a cicatricial hernia after appendectomi is presented where at operation it was found that the margins of the hernia opening in the abdominal wall consisted of an almost circular, rigid, bony formation with an inner diameter measuring 6 x 4.5 cm through which the hernia, the size of a tangerine, protruded.