Primary osteoma cutis occurred in a 19-year-old white boy. The cutaneous calcification has a unique congenital and noninvasive nature. The radiologic and histologic features of the lesions are illustrated. It seems likely that this lesion arises as a membranous osseous hamartoma.
O'Donnell TF, Geller SA. Primary Osteoma Cutis. Arch Dermatol. 1971;104(3):325-326. doi:10.1001/archderm.1971.04000210099020