PMC5842379_01
A) T2 weighted MR scans showing a mesencephalic AVM that caused hydrocephalus with obstruction of aqueduct in sagittal, axial and coronary planes. B) A control CT showing the enlarged lateral ventricle with transependymal edema (left), and the collapsed ventricles following VP shunt procedure, with tip of the ventricular catheter (right). C) A DSA view perimesencephalic AVM in lateral plane, with intraventricular catheter.
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Head CT showed enlargement of lateral and third ventricles with transependymal cerebrospinal fluid oozing (Fig. 1B). A prompt cranial MR revealed serpiginous signal void structures around the midbrain compatible with an AVM and enlargement of the vein of Galen and internal cerebral veins causing mechanical compression of the aqueduct causing an acute obstructive hydrocephalus caused (Fig. 1A). Control CT scan showed good ventricular decompression (Fig. 1B). The late capillary and venous phase was prolonged because of venous hypertension (Fig. 1C).