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Unusual Causes of Conductive Hearing Loss

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1.  The following are all symptoms of superior semicircular canal dehiscence, EXCEPT:
  1. Autophony
  2. Ear pain
  3. Sound-induced dizziness
  4. Hearing loss
2.  A patient with malleus fixation typically presents with complaints of hearing loss in:
  1. Later life/both ears
  2. Teenage years/both ears
  3. Later life/one ear
  4. Teenage years/one ear
3.  Which of the following is considered a third-window lesion of the inner ear that may cause conductive hearing loss?
  1. Enlarged vestibular aqueduct
  2. Otosclerosis
  3. Otitis media with effusion
  4. Cerebrospinal fluid leak
4.  The main differentiating audiometric feature of third-window lesions compared to middle ear lesions such as otosclerosis is:
  1. An air-bone gap
  2. Normal acoustic reflexes
  3. Normal tympanogram
  4. Normal otoscopic exam
5.  Cerebrospinal fluid in the middle ear is characterized by:
  1. Yellow, serous fluid in the middle ear
  2. Normal tympanogram
  3. Sensorineural hearing loss
  4. Clear fluid filling the middle ear space
6.  Malleus fixation differs from otosclerosis in that:
  1. the air bone gaps differ between the two conditions
  2. the hearing loss progression differs between the two conditions
  3. the bone conduction thresholds are different in the two conditions
  4. malleus fixation is rarely bilateral while otosclerosis can be unilateral or bilateral
7.  The best means to diagnose a suspected superior semicircular canal dehiscence is:
  1. MRI (Magnetic resonance imaging)
  2. CT (Computed tomography)
  3. OAE testing
  4. Audiogram
8.  Third-window lesions of the inner ear cause an air-bone gap by which of the following mechanisms?
  1. Worsening of air-conduction thresholds
  2. Improvement in bone-conduction thresholds
  3. Both A and B
  4. Neither A or B
9.  When an air-bone gap is identified in patients with an enlarged vestibular aqueduct, the air-bone gap is typically in the:
  1. Low frequency range
  2. Mid frequency range
  3. High frequency range
  4. All frequencies
10.  The Carhart notch at 2 kHz can be seen in:
  1. Stapes fixation
  2. Incudostapedial joint separation
  3. Malleus fixation
  4. All of the above

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