“…This causes resultant stretching, tearing and occlusion of the cerebellar veins (superior vermian veins and superior cerebellar vein which drain in to the deep venous system), resulting in a venous infarct and venous hemorrhage or direct hemorrhage [6], [13], [17], [18]. It is similar to the "sinking brain syndrome" proposed by Kelley et al, Yoshida et al and Konig et al suggested that RCH is related to the volume of CSF drained, while Choi et al postulates that it may be the velocity of CSF drain in the peri-operative period, both which may be aggravated by negative pressure drainage [15], [19], [21]. Even with a watertight dural seal, postoperative negative pressure exerted by a subfascial drain may precipitate CSF loss between the stitches, leading to pressure shifts and hemorrhage [16].…”