281 - PGI Chandigarh December 2007 Mcqs with answers part 4

19q: Nasopharyngeal carcinoma causes deafness by ?

a. Blocking the eustachian tube
b. serous otitis media
c. Temporal bone metastasis
d. Radiation

answer a and b

20q: About otosclerosis, following are true except ?

a. more common in males
b. commonly unilateral
c. sensory neural hearing loss
d. stapedectomy done

answer b and c are wrong statements. The hearing loss in otosclerosis is bilateral conductive type. Normally females are twice as often affected with this disease than males, but in india it is predominant in males.

21q: Bone which is pneumatic ?

a. maxillary
b. parietal
c. temporal
d. frontal
e. ethmoidal

answer a, d, e.

22q: True about tympanic membrane ?

a. tympanosclerosis increases compliance
b. ossicular disruption with intact tympanic membrane decreases compliance
c. fluid in middle ear cavity increases compliance
d. otosclerosis decreases compliance

answer d is the only true statement. Otosclerosis and tympanosclerosis decreases compliance. option b increases compliance.Middle ear effusions result in no change in compliance.

23q: True in temporal bone surgery ?

a. mastoid makes landmark
b. trautmenn's triangle used as a guide for incision
c. antrum acts as landmark

answer b is the only true statement. Trautmenn's triangle is defined as the area limited by the anterior border of the sigmoid sinus posteriorly, the petrous ridge superiorly and a line connecting the jugular bulb to the petrous apex anteriorly .