Bartonella Endocarditis Presenting as Recurrent Cerebral Mycotic Aneurysm.

Bartonella henselae is a known cause of culture-negative endocarditis, which can be difficult to diagnose without a high clinical suspicion as specific diagnostic testing is required.  We report the case of a 48-year-old male who presented with altered sensorium. A CT of the head showed left-hemispheric intracranial hemorrhage (ICH) likely secondary to ruptured left posterior cerebral artery (PCA) fusiform aneurysm seen on catheter cerebral angiogram, which was treated with endovascular embolization.