Pericallosal artery aneurysms are rare. Very few cases of this vascular anomaly have been published from West Africa. We report the first case of a ruptured pericallosal artery (PCA) aneurysm managed in a Nigerian neurosurgical facility, with the aim to add to the limited documentation on vascular brain lesions in our sub-region. The management outcome of the index patient and a literature review on these unusual aneurysms were also discussed.
A middle-aged known hypertensive woman who presented with clinical features of a WFNS grade I subarachnoid hemorrhage (SAH). A plain cranial computerized tomography (CT) scan revealed SAH, a supracallosal intracerebral hematoma and intraventricular hemorrhage. Cranial computerized tomography angiography (CTA) showed a small right pericallosal artery aneurysm, which was treated (with clipping via an interhemispheric approach) in a resource-constrained neurosurgical facility. The patient has remained well over a six-year follow-up period.
PCA aneurysms have a high tendency to bleed compared with other supratentorial intracranial aneurysms in spite of their small size. Microsurgical approach, although difficult, is an effective treatment option for these rare aneurysms.
Surgical clipping remains a safe and useful treatment option for pericallosal artery aneurysms in a low-resource neurosurgical facility.

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