SOCIETY OF BRITISH NEUROLOGICAL SURGEONS.

Abstract

A. A. MCCONNELL Six patients who had sustained concussion and had become accessible continued in a state of amnesia for over five days. Exploratory operations were performed. In one case nothing abnormal was found; in five cases a definite subdural effusion (" subdural hydroma ") was present. It was suggested that the subdural effusion had been a factor in the prolongation of the amnesia following concussion. The fluid accumulation was bilateral in two of the cases. The volume of the hydroma was as much as 200 c.c. in one case, and the protein content of the fluid was recorded as high as 3 per cent. Rapid improvement in symptoms following evacuation of the hydroma was evidence of its importance in maintaining disability.