This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: CSOM and its Complications, Subject name: ENT
Greisinger's sign is suggestive of- 
Select and explain. 
A. Acute mastoiditis with lateral sinus thrombosis, B. Maxillary cancer with spread to nasal cavity, C. Rhinosporidiosis, D. Jugular vein thrombosis
A: Acute mastoiditis with lateral sinus thrombosis
Answer: A: Acute mastoiditis with lateral sinus thrombosis 
Explanation: Ans. is 'a' i.e., Acute mastoiditis with lateral sinus thrombosis Signs of lateral sinus thrombosis (sigmoid sinus thrombosis)o Griesinger's sign:- odema over the posterior part of mastoid due to thrombosis of mastoid emissary veinso Papilloedemao Tobey-Ayer testo Crowe-Beck test:- Pressure on jugular vein of healthy side produces engorgement of retinal veins. Pressure on affected side does not produce such changeo Tenderness along jugular vein