| subdural haematoma | <neurology, surgery> A serious type of head injury characterised by a collection of blood under the dura mater adjacent to the brain. Acute subdural haematomas are a surgical emergency that usually result from head trauma. (06 Mar 1998) |
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| subdural haematorrhachis | haematorrhachis externa |
| subdural haemorrhage | Extravasation of blood between the dural and arachnoidal membranes; acute and chronic forms occur; chronic haematomas may become encapsulated by neomembranes. Synonym: subdural haematoma. (05 Mar 2000) |
| subdural hygroma | Accumulation in the subdural space of proteinaceous fluid, usually derived from serum, or of cerebrospinal fluid due to a tear in the arachnoid membrane. (05 Mar 2000) |
| subdural space | Originally thought to be a narrow fluid-filled interval between the dural and arachnoid; now known to be an artificial space created by the separation of the arachnoid from the dura as the result of trauma or some ongoing pathologic process; in the healthy state, the arachnoid is attached to the dura and a naturally occurring subdural space is not present. Synonym: spatium subdurale, cavum subdurale, subdural cavity, subdural cleavage, subdural cleft. (05 Mar 2000) |
| empyema, subdural | An intracranial suppurative process between the dura and the arachnoid. The infection gains entrance to the subdural space from the frontal and ethmoid sinuses, the middle ear, and the mastoid cells. (12 Dec 1998) |