OSTEOMATOSIS CUTIS

Abstract
Bone formation in the skin is relatively rare. Bone development is infrequent in areas which are not the site of a previous lesion or in areas of tissue degeneration and is referred to as primary bone formation. Also uncommon are osteomas developing by metaplasia as secondary bone formation in tumors, scars or areas of inflammation. The purpose of this report is to present a case of secondary cutaneous osteogenesis and to emphasize the difficulty of clinical diagnosis of some of these lesions. REPORT OF CASE A white woman aged 34 came to the clinic on Jan. 4, 1941. In the course of a general examination a cutaneous lesion was incidentally found, situated about 2 cm. proximal to the superior border of the right patella. It was an oval lesion, 8 by 11 mm., freely movable and nontender. The center was reddish gray with a smooth, dry, slightly scaly surface. The

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