[Unusual radiological and clinical findings in a calcified chronic extradural haematoma (author's transl)].

In three of 32 patients with epidural haematomas calcifications and ossifications of the bleeding were found. Quickly developing (3 to 7 weeks) ossifications could be demonstrated by repeated X-rays and CT of the skull in partial drained or untreated haematomas. No ossification could be observed in the remaining 29 cases, in which the haematomas were completely removed. The growth of the ossification from the parietal to the visceral side within the capsules of the haematomas could be monitored in its progress by CT and was histologically verified. The underlying pathological mechanisms are discussed.