Abstract
THE CHARACTERISTIC feature of heterotopic bone formation within abdominal scars is the appearance of an ossified mass along a longitudinal incision in an adult male within one year following surgery; usually an upper-abdominal incision which is contiguous to a bony structure is involved.1-3 Roentgenographic examination of the area will readily confirm the diagnosis. However, because of its uncommon occurrence and location, the condition may not be suspected on initial encounter or may be mistaken for such lesions as incisional implants of carcinoma or, as in our first case, a retained foreign body. Recently we encountered our first two cases of this condition in brothers. In none of the 19 previously reported cases of which we are aware has any familial relationship been recorded. This unique circumstance and the opportunity to reemphasize the possible development of this condition within abdominal surgical scars has prompted us to report these two cases.

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