Background: Extra-axial chronic fluid collections are pathological conditions occurring more frequently in the paediatric age, particularly in children less than two-year-old. Although recognised for many years and repeatedly reported in the literature, some aspects of their treatment are still under debate. This review of the management of chronic subdural collections is based on our experience of 72 cases treated between January 1984 and December 2000.
Method: Patients were divided into four groups according to aetiology. Thirty-four cases (47%) occurred following various surgical procedures; 14 cases (20%) occurred as complications of leptomeningeal infections; 13 cases (18%) were post-traumatic, whereas no obvious aetiology could be detected in the last 11 cases (15%). The collections were unilateral in 34 patients (47%) and bilateral in the other 38 (53%).
Findings: Thirty-five patients (48%) were treated by means of a temporary subdural external drainage (SED) (for a total of 38 SED procedures), which was maintained for a mean of 5.8 (+/-3.4) days; it was effective in 26 cases, whereas in the other 9 it was necessary to perform a subdural-peritoneostomy (SPS). Three of these 38 SEDs were complicated by infection. In one more child the external drainage was complicated by a chronic subdural haematoma. A SPS was performed in 44 cases (61%), 9 being failed external drainages. Only in 16 (38%) of these 44 patients the SPS was removed after an average of 27.0 (+/-16.6) months. Three patients (4%) were treated by craniotomy and resection of the neomembranes lining the subdural fluid collection. Obstruction of the SPS occurred in 6 children, infection in 4. Good results were obtained with either external or internal drainage. In fact post-operative neuroradiological investigation disclosed in all the cases complete or almost complete cerebral re-expansion; also the clinical outcome was generally very good, although largely dependent upon the basic clinical condition. Unilateral subdural-peritoneal and/or external drainage was effective also in case of bilateral collections. Only 2 patients required temporary bilateral external drainage.