Acoustic neuroma presenting as sudden hearing loss

Radiological factors related to pre-operative hearing levels in patients with vestibular schwannomas

“…The underlying mechanisms are supposed to be related to compression of the auditory nerve fibers, to their infiltration, and/or to impairment of the blood supply to the nerve or inner ear. [1][2][3][4] Increased intrameatal pressure is a causative factor in hearing deterioration. 5 However, the published data are largely contradictory.…”

Schwanoma vestibular como causa de surdez súbita

“…Conventional VS audiometry demonstrated mild to moderate loss with low level of discrimination. Several studies however do not show conventional audiometric pattern 1,12,14,18 . Owing to several likely etiopathogenic mechanisms VS may cause SHL of varied intensity, both cochlear and retrocochlear losses, in high, medium and low frequencies, with or without stapedian reflex.…”

“…The improvement of SHL, with or without treatment, does not exclude VS diagnosis. The improvement of Sudden Hearing Loss caused by VS is reported as rare 12,14 , but partial to total improvement may occur with steroid therapy 1,4,12,[14][15][16][17] . Steroid drugs may act on the edema and ischemia resulting from inflammation, leading to the reduction of the intracanalicular tumor mass through absorption of intratumor fluids.…”

Cochlear Microphonic Potentials in Patients with Vestibular Schwannomas

“…Among these configurations, middle frequency hearing loss has been useful in the diagnosis of vestibular schwannomas in patients who present with sudden hearing loss as the initial symptom [27][28][29][30]. Saunders et al [30] retrospectively reviewed 836 cases of sudden deafness and found 4 vestibular schwannomas in 29 cases with middle frequency hearing loss.…”