Subgaleal drains may also contribute to the phenomenon by causing stretching of the cerebellar veins (due to the negative upward pressure).
Resultant stretching, occlusion, and tearing of the superior vermian vein and the superior cerebellar vein, which drain into the deep venous system, causes a venous infarct, whereas the overall increase in venous pressure ruptures the venous circulation, triggering a haemorrhage [9].