[Tumors and space-occupying abnormalities of the skull calotte].

Clinical and demographic data as well as the course of illness were analyzed in a retrospective study of 50 patients with a primary tumor or a malformation of the calvarial bones. The most frequent histological diagnosis was "eosinophilic granuloma of bone" (found in 42% of cases), followed by hemangioma, osteoma, dermoid, epidermoid and malignant tumors, and fibrous dysplasia. Local recurrence was observed in 1 patient with ossifying fibroma and 1 with a dermoid tumor, while further dissemination of illness was observed in 3 patients with "eosinophilic granuloma". In these cases, systemic drug therapy is needed. The necessity of an intensive search for further signs of illness and long follow-up periods in patients with primary localized histiocytosis X is stressed.