Table 2.

Surgical, radiographic and clinical outcome variables of n = 52 patients patients recieving supratentorial cerebrospinal fluid diversion using image-guided trigonal ventriculostomy during retrosigmoid craniotomy for cerebellopontine angle tumors.

Surgical outcomes	Total (n = 52, 100%)
Single attempt for successful ventriculostomy	49 (94%)
Two attempts for successful ventriculostomy	3 (6%)
Successful CSF-diversion and pulsatile dura prior durotomy without signs of cerebellar contusion, swelling or herniation through the dural incision	51 (98%)
Postoperative hydrocephalus
Due to impaired resorption	4 (8%)
Due to 4th ventricle compression	6 (11%)
Due to upward transtentorial herniation	2 (4%)
Permanent CSF-diversion after surgery	5 (11%)
Days to shunting [mean, (min-max), median]	91, [3–246], 30
Radiographic outcomes
Catheter tip location and grade
Grade 1: Ipsilateral trigonum, occipital horn or lateral ventricle	35 (67%)
Grade 2: Contralateral trigonum, occipital horn or lateral ventricle / interhemispheric fissure	15 (28%)
Grade 3: Intraparenchymal or basal ganglia	2 (4%)
Supratentorial hemorrhagic complications
Ventriculostomy-related hemorrhage	6 (11%)
Intracerebral hemorrhage	2 (4%)
Intraventricular hemorrhage	2 (4%)
Midline shift	1 (2%)
Ventriculostomy-related revision surgery	0 (0%)
Parenchymal lesion in magnetic resonance imaging
One visible catheter tract	41 (79%)
Two visible catheter tracts	3 (6%)
No visible ventriculostomy tract	8 (15%)
Cortical scarring related to ventriculostomy	15 (29%)
Signs of local infarction	1 (2%)
PCA/SCA infarction	0 (0%)
Radiological signs of upward trans-tentorial herniation	0 (0%)
Clinical outcomes
Seizures related to supratentorial ventriculostomy-related hemorrhage	0 (0%)
Ventriculostomy-related homonymous hemianopsia	0 (0%)
Ventriculostomy-related focal neurological deficit	0 (0%)
Ventriculostomy-related infection	0 (0%)

MRI, magnetic resonance imaging; CSF, cerebrospinal fluid; PCA, posterior cerebral artery; SCA, superior cerebellar artery.