Two cases of unilateral lesion of the inferior colliculus presenting with temporally changing, distinctive tinnitus and hearing impairment

Key Points

• This research aims to describe two cases of patients with unilateral lesions in the inferior colliculus presenting unusual tinnitus and hearing impairment.
• Presented two case reports featuring detailed patient histories and MRI findings.
• Analyzed the auditory symptoms and changes in tinnitus over time for each patient.
• Conducted a follow-up to assess the impact on speech recognition capabilities.
• Patient 1 experienced propeller-like tinnitus that evolved into distinct high-pitched sounds.
• Patient 2 reported alternating tinnitus resembling cicadas and electronic noises.
• Both patients demonstrated auditory recognition impairment related to speech sounds, reflecting the lesion's impact.