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Table 4: 
Frequencies of superior petrosal vein drainage groups for each cerebellopontine angle (n = 50) and each superior petrosal vein (n = 83)
Drainage GroupFrequency of Group/SideFrequency of Group/SPV
LeftRightTotalLeftRightTotal
Petrosal252449/50 sides (98%)313162/83 (74.7%)
Posterior mesencephalic222244/50 sides (88%)222345/83 (54.2%)
Anterior pontomesencephalic232144/50 sides (88%)272754/83 (65.1%)
Tentorial141529/50 sides (58%)141529/83 (34.9%)