title: Pseudotumour of the corpus callosum due to subarachnoid haemorrhage from pericallosal aneurysm.
abstract: Two patients were scanned 2-5 weeks following onset of subarachnoid haemorrhage. A similar CT appearance was seen in each case. A ring enhancing mass lesion was present within the corpus callosum, suggesting an underlying tumour. However subsequent angiography showed that each case was in fact due to rupture of a pericallosal artery aneurysm. The enhancing membrane of the haematoma gave the false impression of a corpus callosum tumour.
mesh_terms: D000328:Adult; D001932:Brain Neoplasms / Q000000981:diagnostic imaging*; D003337:Corpus Callosum; D003937:Diagnosis, Differential; D005260:Female; D005910:Glioma / Q000000981:diagnostic imaging*; D006406:Hematoma / Q000000981:diagnostic imaging; D006801:Humans; D002532:Intracranial Aneurysm / Q000000981:diagnostic imaging*; D008297:Male; D008875:Middle Aged; D012422:Rupture, Spontaneous; D013345:Subarachnoid Hemorrhage / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed