This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ear, Subject name: ENT
Tobey Ayer test is positive in 
Select and explain. 
A. Lateral sinus thrombosis, B. Petrositis, C. Cerebral abscess, D. Subarachnoid hemorrhage
A: Lateral sinus thrombosis
Answer: A: Lateral sinus thrombosis 
Explanation: Tobey Ayer test is positive in lateral sinus thrombosis. Tobey-Ayer test: This is to record CSF pressure by the manometer and to see the effect of manual compression of one or both jugular veins. Compression of a vein on the thrombosed side produces no effect while compression of a vein on the healthy side produces a rapid rise in CSF pressure which will be equal to bilateral compression of jugular veins. (Ref: Textbook of diseases of ENT, PL Dhingra, 7th edition, pg no. 93)