<prompt> Crowe-Beck test is positive inStage of localization of brain abscessStage of termination of brain abscessLateral sinus thrombophlebitisOtitic hydrocephalus  <response>: Ans. c Lateral sinus thrombophlebitis Ref. PL Dhingra ENT 2nd ed., 89LATERAL SINUS THROMBOPHLEBITIS SIGMOID SINUS THROMBOSIS A lateral sinus thrombosis may occur with an infected cholesteatoma.Clinical Features Characteristic high spiking fever with rigors and a picket-fence pattern; Headache; anaemia and emaciation Signs and test:- Pappilloedema- Griesingers sign: Pain, redness, and swelling of tip of mastoid due to involvement of the mastoid emissary veins.- Tobey-Ayer test- Lillie-Crowe-Beck test: is used to diagnose unilateral lateral sinus occlusion Digital compression of the opposite internal jugular vein causes retinal veins to dilate, as the major venous outflow tracts on both sides now blocked.- Tendreness along jugular vein CECT: Empty delta sign: CT sign of dural venous sinus thrombosis superior sagittal sinus, where contrast outlines a triangular filling defect clot. MR venogram is the best investigation IOC for diagnosis Rx: It is treated like a lateral sinus thrombosis in association with acute coalescent mastoiditis. If the cholesteatoma is extensive, a CWD mastoidectomy should be performed.OTITIC HYDROCEPHALUS It is defined as T intracranial pressure secondary to acute or chronic middle ear infection without evidence of meningitis or subdural or brain abscess. It characteristicallx presents as headache and lethargy in a patient with an ear infection. MRI easily identifies sigmoid sinus thrombosis with total occlusion. Papilledema is almost always present; however, papilledema is not always an adequate predictor of - intracranial pressure. Treatment of otitic hydrocephalus requires:- mastoidectomy appropriate for the disease,- exposure of all diseased dura to normal dura, and- removal of excess extradural granulation tissue.Also Know:ABLE test of fowlerTo test recruitment as in meneiers diseaseBing test and Chamini moss testTuning fork test to detect hearing lossCrowe Beck testLateral sinus thrombosisTobey Ayer Queckenstedts testLateral sinus thrombosisDoerfier Stewart test, Erhards test, Gaults testTo detect malingering. 