Malpositioned extraventricular drain
Admitted following subarachnoid haemorrhage. Ventricular drain inserted to decompress hydrocephalus but persistent reduced GCS ?cause
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Hydrocephalus, intraparenchymal and intraventricular haemorrhage.
The EVD tract is hyperdense but this is from blood. The EVD itself lies extracranially, with tip located in a large right frontal subgaleal collection.
Left cerebellar haematoma and small volume post-surgical pneumocephalus are also noted.
This patient underwent external ventricular drain (EVD) insertion due to hydrocephalus, developed as a complication of SAH. The EVD was dislodged, with acute haemorrhage visible through the intracranial tract and the drain tip located in a subgaleal collection.
It is important to review the imaging on multiple planes and windows, and to bear in mind that intracranial drains should always be well visible on CT. Clinically, the EVD was patent and working, but draining a subgaleal collection rather than CSF.