Question 1 · Medium
A 12-year-old boy has not heard well in his right ear since he had mumps 2 months ago. Both tympanic membranes are normal. With a 512 Hz fork, Rinne test is negative on the right and positive on the left, and Weber test is lateralised to the left. What do these findings indicate?
- AConductive hearing loss in the left ear
- BConductive hearing loss in the right ear
- CSevere sensorineural loss in the right ear
- DSensorineural hearing loss in the left ear
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Answer: C · Severe sensorineural loss in the right ear
Mumps is a common cause of sudden, one-sided, profound sensorineural hearing loss in children. Weber goes to the better cochlea in sensorineural loss, which here is the left. The negative right Rinne is a false negative: bone-conducted sound from the mastoid crosses the skull and is heard by the good left ear, while air conduction is not heard on the dead right side. Masking the left ear with a Barany noise box during the test, followed by pure tone audiometry, reveals the true picture.
- A: Left conductive loss would make the left Rinne negative.
- B: Right conductive loss would send Weber to the right, not the left.
- D: Left sensorineural loss would lateralise Weber to the right.