Contralateral tinnitus and hearing loss due to a tumor at the region of inferior colliculus: illustrative case.

Kourosh Eftekharian,Guive Sharifi,Ali Eftekharian,Farahnaz Bidari-Zerehpoosh

doi:10.3171/case21624

Kourosh Eftekharian, Guive Sharifi + Show 2 more

Open Access

https://doi.org/10.3171/case21624

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Abstract

BACKGROUNDSubjective hearing loss resulting from unilateral lesions of the quadrigeminal cistern region or inferior colliculus is a rare entity.OBSERVATIONSThe authors presented the case of a 32-year-old man with a history of 4 months of nonpulsatile tinnitus and 1 month of unilateral sensorineural hearing loss. He was otherwise healthy with no significant previous medical history. Intravenous gadolinium contrast magnetic resonance imaging of the head revealed a lesion at the region of the left inferior colliculus suggestive of a lipoma. The tumor was removed, and the patient had no significant hearing change afterward, with an improvement in tinnitus. The histological examination demonstrated the tumor as a fibrolipoma.LESSONSContralateral subjective hearing loss is an uncommon presentation for a lesion in the region of the inferior colliculus.

Highlights

Subjective hearing loss resulting from unilateral lesions of the quadrigeminal cistern region or inferior colliculus is a rare entity
Because of the central auditory system’s extensive interconnected pathways, subjective hearing loss resulting from unilateral lesions of the quadrigeminal cistern region or inferior colliculus is rare
History and Examination A 32-year-old right-handed man with a 4-month history of tinnitus in the right ear presented to our clinic

Summary

BACKGROUND

Subjective hearing loss resulting from unilateral lesions of the quadrigeminal cistern region or inferior colliculus is a rare entity. OBSERVATIONS The authors presented the case of a 32-year-old man with a history of 4 months of nonpulsatile tinnitus and 1 month of unilateral sensorineural hearing loss. He was otherwise healthy with no significant previous medical history. LESSONS Contralateral subjective hearing loss is an uncommon presentation for a lesion in the region of the inferior colliculus. Because of the central auditory system’s extensive interconnected pathways, subjective hearing loss resulting from unilateral lesions of the quadrigeminal cistern region or inferior colliculus is rare. We discuss a case of quadrigeminal plate lipoma with uncommon presentations

Illustrative Case

Discussion