PMC5818847_01
CT image showing a subcortical hematoma in the right occipital lobe, along with bilateral intraventricular hematomas
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Fig1
Brain computed tomography (CT) showed a subcortical hematoma in the right occipital lobe along with bilateral intraventricular hematomas, which were judged as being a result of rupture of a brain AVM (Fig. 1).
Vertebral angiogram, lateral view (left) and anteroposterior view (right), showing a grade 2 AVM. The brain AVM measured about 1 cm in diameter (small, 1 point), was located adjacent to the visual cortex (eloquent, 1 point), and drained into the superior sagittal sinus (superficial drainage only, 0 point)
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Fig2
The draining vein could not be clearly identified but likely drained into the superior sagittal sinus (Spetzler and Martin grade 2; size of the AVM, 1 point/eloquence of the adjacent brain, 1 point/pattern of venous drainage, 0 point) (Fig. 2).  AVMs is remarkably low. According to the Spetzler and Martin grading system, the AVM of the present patient was judged as being grade 2 and as being indicated for surgical resection; however, it was deep-seated in the brain and not located in an easily accessible area (Fig. 2).