INTRODUCTIONIntracranial cavernous angiomas (cavernomas, cavernous hemangiomas, cavernous malformations) usually cause intraparenchymal hemorrhage but are rarely described as a cause of isolated subarachnoid hemorrhage (SAH)., Some cases of intracranial cavernous angiomas presenting with isolated SAH have been reported., However, cavernous angiomas presenting with so-called angiographically negative aneurysmal-like SAH are rare. To our knowledge, only one case of cavernous angioma presenting with perimesencephalic SAH has been reported.

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Cerebral cavernous venous malformations, commonly known as cavernous hemangioma or cavernoma, are common cerebral vascular malformations, usually with characteristic appearances on MRI. Cavernous malformations are found throughout the body. This article focuses on cerebral cavernous venous malformations. A cavernous angioma is a blood vessel abnormality characterized by large, adjacent capillaries with little or no intervening brain. The blood flow through these vessels is slow. Cavernous angiomas can occur anywhere in the central nervous system.

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We describe a case of cavernous angioma presenting with SAH, which was diffusely distributed in the basal cisterns and mimicked intracranial aneurysm rupture. CASE REPORTA 50-year-old woman suddenly developed severe headache, vomiting, and dizziness, and had a high blood pressure (193/103 mmHg). Brain computed tomography (CT) showed that SAH was diffusely distributed in the basal cisterns, as well as blood at the fourth ventricle Figure –. However, repetitive CT angiography and digital subtraction angiography failed to reveal an identifiable source of the SAH. Brain magnetic resonance imaging (MRI) performed on day 10 showed a cavernous angioma on the surface of the left cerebellar hemisphere , which became more obvious on subsequent MRI on day 16 Figure –.

We concluded that this angioma was the cause of the SAH. An obscure lesion suggestive of the presence of cavernous angioma was found on retrospective review of the initial CT. We recommended surgical treatment, but the patient requested conservative management. Therefore, she was treated conservatively and discharged on day 26 in good condition. As of 21 months after onset, she is in good health with no evidence of rebleeding. (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. DISCUSSIONWe described a case of cavernous angioma presenting with SAH, which was diffusely distributed in the basal cisterns and mimicked intracranial aneurysm rupture.

Cavernous angiomas are vascular hematomas of blood vessels. The incidence of cavernous angiomas ranges 0.4–0.6% in the general population, and approximately 36% of these present with hemorrhage. Intraparenchymal hemorrhage usually occurs but intracranial cavernous angiomas presenting with isolated SAH are rare.,Some cases of cavernous angiomas in the brain stem, cerebellum, cerebellopontine angle, sylvian cistern, and suprasellar cistern presenting with isolated SAH have been reported., In these cases, the patterns of SAH differed from aneurysmal SAH.

Cavernous angiomas presenting with so-called angiographically negative aneurysmal-like SAH, such as the present case, are rare with only one reported case presenting with perimesencephalic SAH.The precise percentage of cavernous angioma in angiographically negative SAH is unknown. Of 213 patients with CT angiographically negative SAH, Heit et al. Reported that a single cortical cavernous malformation (0.4%) was identified on MRI. Woodfield et al.

Performed subsequent MRI on 131 of 240 patients with angiographically negative SAH, and only 2 of them (1.5%) had cavernous malformation.In our case, the lesion gradually became apparent on delayed MRI over time. An obscure lesion, which suggested the presence of cavernous angioma, was found by a retrospective review of the initial CT after identifying the cavernous angioma on MRI.