Familial "doughnut" lesions of the skull. A benign, hereditary dysplasia

Multiple calvarial doughnut lesions present a dramatic roentgenographic picture. The scant literature indicates that they are benign, asymptomatic, and of obscure etiology. Three additional examples of this rare entity have been identified all in the same family and are presented. The implication of a familial relationship with regard to develpmental pathogenesis is discussed. Histology is nonspecific but is felt to be consistent with hyperostosis.