[Subdural empyema. Apropos of 17 cases].

Seventeen patients with subdural empyema were treated from 1985 to 1993. These included 13 males and 4 females with 11 patients aged between 12 and 30 years old. Sinusitis was found to be the primary source of infection in 16 cases. The clinical presentation was classic and the preoperative diagnosis was established on the first CT in 12 cases. In the remaining cases a second or third CT was necessary to demonstrate the empyema, 24 to 48 hours later. Surgical management was first made by burr holes with a small craniectomy in 15 cases. A large craniotomy was performed in 2 patients. Soft catheter drainage was carried out in 6 cases, 9 patients received surgical treatment once (3) or twice (6). Two patients, operated on while in a coma (stage IV of Bannister scale) died and one patient survived with severe disability (operated at stage III). The others (14) made a good recovery (6 in grade A and 8 in grade B of Mauser). These results were compared with those in the literature and we concluded that the mean factor of prognosis is the level of consciousness at the time of initial treatment. In most of the cases, burr holes or a small craniotomy, carried out on the basis of CT or MRI data, are the easiest and most effective method of surgical treatment.