Diffuse mass effects are caused by generalized cerebral edema, which is an excessive buildup of fluid throughout the brain tissue.

弥散性占位效应的原因可能是广泛性大脑水肿（全脑水肿），即整个脑组织中液体的过度积聚。

This causes generalized edema which is often seen in the legs, face and hands; pulmonary edema which can cause cough and shortness of breath; and cerebral edema which can cause headache, confusion, and seizures.

全身性水肿，主要累及下肢、面部和手部；以及肺水肿，造成咳嗽、气促；还有脑水肿，造成头痛、意识不清和癫痫发作。