[Unusual complications in the course of histiocytosis X (author's transl)].

In 3 patients with histiocytosis X the following complications are described: 1. A 16 year old boy suffered from generalized histiocytosis in infancy. He died after acute intracranial hypertension caused by a basilar impression. 2. Recurrent spontaneous pneumothoraces was the first symptom of an initial exclusively pulmonary histiocytosis X. 3. Exophytically growing soft tissue tumors in the late disease state of a progressive histiocytosis X.