PMC5590347_01
(a-c) Axial slices of acute unenhanced brain CT show SAH diffusely distributed in the basal cisterns and also show blood at the fourth ventricle. An obscure lesion, which suggested the presence of cavernous angioma (arrow), was found by retrospective review of the initial CT scan. (d) Axial T2-weighted image on day 10 shows a hypointense lesion on the surface of the left cerebellar hemisphere. (e) Axial T2-weighted image on day 16 more obviously shows the angioma. (f) Axial T2-weighted image on day 16 shows a mixed signal core surrounded by a hypointense rim. (g) Contrast-enhanced T1-weighted image shows a coexisting, developmental, venous anomaly
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F1
Brain computed tomography (CT) showed that SAH was diffusely distributed in the basal cisterns, as well as blood at the fourth ventricle [Figure 1a-c]. Brain magnetic resonance imaging (MRI) performed on day 10 showed a cavernous angioma on the surface of the left cerebellar hemisphere [Figure 1d], which became more obvious on subsequent MRI on day 16 [Figure 1e-g]. An obscure lesion suggestive of the presence of cavernous angioma was found on retrospective review of the initial CT [Figure 1c].