Presentation
Temporal lobe epilepsy.
Patient Data
In the left parahippocampal gyrus is a peripherally hemosidering lined lesion consistent with a cavernous malformation.
They went on to have a resection.
Histology
MICROSCOPIC DESCRIPTION: Sections show a nidus of thin walled vessels with a back-to-back arrangement and containing blood clot. Vessel walls are composed of homogenous hyalinised collagen. The adjacent brain parenchyma contains abundant hemosiderin laden macrophages, consistent with previous hemorrhage. There is associated mild gliosis. There is no evidence of malignancy. The features are of cavernous hemangioma.
DIAGNOSIS: Cavernous hemangioma.
A left-sided craniotomy is noted, with post surgical change extending through the temporal lobe to the site of previous cavernous malformation, which now appears resected with no convincing residual cavernoma evident, and only a small amount of residual hemosiderin staining. A 17mm deep subdural collection extends over the left cerebral convexity exerting significant local mass effect and 5 mm midline shift. The remainder of the brain is unremarkable.
Left temporoparietal craniotomy noted. Left cerebral convexity subdural hematoma is mostly isodense to brain parenchyma and measuring up to 20 mm in depth. Mass-effect with effacement of the left cerebral sulci, effacement of the body and trigone of the left lateral ventricle and midline shift towards the right up to 5 mm at the septum pellucidum.
No CT evidence of acute cortical ischemia. No hydrocephalus.
Case Discussion
Cavernomas are quite epileptogenic and thus a lesions worth carefully seeking when evaluating a patient with epilepsy. In this case not only is the cavernous malformation large but also closely related to the hippocampus.
Post operative subdural hematoma with a good example of isodense collection on CT.