[Chronic subdural hematoma in adults. Prognostic factors of surgery. Apropos of 100 cases].

One hundred chronic subdural haematomas in the adult are presented in a retrospective study, looking for correlations between results and aetiological, clinical, radiological and therapeutic elements. Only four parameters are correlated with results: headache and isodensity on C.T. Scan are good prognostic factors (p less than 0.02 and p less than 0.04 respectively); on the other hand chronic alcoholism (p less than 0.03) and even more postoperative pneumatocele (p less than 0.007) are correlated with a poor result. Pneumatocele is due to intracranial hypotension which is the major factor promoting formation and development of chronic subdural haematoma occurring in aged population.