Heterotopic Bone in a Pigmented Nevus

Osteoma cutis, either primary or secondary, occurs very rarely, as is evidenced by the fact that Hopkins 1 in reviewing the literature in 1928 could find only five cases. During the next 20 years Leider 2 could uncover only seven additional cases. Such calcifications have reportedly occurred in ulcers, cysts, scars, lupus erythematosus, acne vulgaris and scleroderma and finally as embryonic cell rests. The only case previously recorded in which true bone was found in a pigmented nevus was that of Heidingsfeld. 3 The case herein described bears some resemblance to that one. REPORT OF A CASE A 42 year old white woman was referred for treatment of a pigmented lesion on the right cheek which had been present since childhood. This had increased considerably in size during the preceding months and had become slightly tender. One inch (2.5 cm.) above and lateral to the right angle of