Why is there cerebral edema but not peripheral edema in SIADH ?
Because SIADH causes hyponatremia due to this osmolality of ECF decrease and the osmolality of brain tissue more than ECF so it causes cerebral edema.
Interacrania pressure it's like a pressure cooker and when you tighten the lid even on high too cook once done it let's out when open like a vacuum pressure