[Hydrocephalus after subarachnoid hemorrhage regressing spontaneously through the subgaleal layer: case report].

Spontaneous regression was recognized in a case of hydrocephalus after subarachnoid hemorrhage. The regression resulted after the absorption of cerebrospinal fluid through the subgaleal layer. The absorption of cerebrospinal fluid through this layer takes a long time but is one of nature's physiological pathways. The spontaneous regression of hydrocephalus through the subgaleal layer may be temporarily useful until a more effective physiological pathway is provided by a shunt operation to deal with hydrocephalus.