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The clinical features of 12 patients with deafness due to mumps, including one with asymptomatic mumps, are reviewed. The diagnosis was made according to the criteria for diagnosis of mumps deafness determined by the Acute Profound Deafness Committee set up by the Ministry of Health and Welfare, Japan.1) The 12 patients were 5 to 25 years old (mean, 9.5).2) All 12 had unilateral total or profound sensorineural hearing loss.3) Hearing did not improve after treatment.4) Six patients complained of dizziness or vertigo. Eight patients were examined with the ice water caloric test; four showed a normal response and four no response.The patient with deafness due to asymptomatic mumps was a 5-year-old girl, who complained of dizziness and hearing loss in her left ear. Three days after the onset of deafness, she visited our hospital. Total sensorineural hearing loss on the left and right-beating nystagmus were noted. Her left ear showed no response to the ice water caloric test. Treatment with steroid medication did not improve her hearing. No swelling of the salivary glands was noted during the entire clinical course. Paired sera taken 3 days and 18 days after the onset of deafness showed a significant increase in antibody titer to mumps virus, confirming the diagnosis of asymptomatic mumps. The importance of serological tests in such a case is discussed.

Deafness in Patients with Mumps.