Question
Tympanogram of a 70 year old male with hearing loss and tinnitus revealed a wave as shown in the picture below.
On examination he has a conductive type of deafness and a dull tympanic membrane on the right side. Lympadenopathy was present in the posterior triangle of neck. The most likely diagnosis is ?
A. Middle ear tumor.
B. Nasopharyngeal malignancy.
C. Acoustic neuroma.
D. T.B of middle ear.
Show Answer
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Correct Answer » B
Explanation
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Ans : B. Nasopharyngeal malignancy.
The type of tympanogram shown in the picture above represents Type B tympanogram.
TYPES OF TYMPANOGRAM
- Type A – normal middle ear function.
- Type As – (Low compliance) otosclerosis, malleus fixation
- Type Ad (High compliance) ossicular discontinuity or thin and lax tympanic membrane
- Type B – (No change in compliance with pressure changes) Middle ear fluid as in Secretory Otits Media.
- Most common cause of Type B tympanogram in an old aged patient with neck nodes is Nasopharyngeal Carcinoma.
- Type C – (Maximum compliance occurs with negative pressure in excess of 100 mm of H20) retracted tympanic membrane indicates a malfunctioning eustachian tube.
