A 30year old woman with family history of hearing loss from her mother’s side developed hearing loss which is bilateral, slowly progressive, pure tone audiometry shows the bone conducting hearing loss with an apparent bone conduction hearing loss at 2000Hz. What is the most likely diagnosis
## **Core Concept**
The question describes a patient with a family history of hearing loss, presenting with bilateral, slowly progressive hearing loss. The audiometry findings indicate a specific pattern of hearing loss, particularly with an apparent bone conduction hearing loss at 2000Hz. This presentation suggests an otosclerotic process, which affects bone conduction and is a form of conductive hearing loss.
## **Why the Correct Answer is Right**
The patient's symptoms and audiometry findings are classic for **otosclerosis**, a condition characterized by abnormal bone growth in the middle ear that causes hearing loss. Otosclerosis often presents with a conductive hearing loss, particularly affecting low-frequency sounds, and can have a characteristic "Carhart's notch" at 2000Hz, where there's an apparent bone conduction hearing loss. This condition is more common in women and can have a familial component. The slow progression and bilateral involvement also align with otosclerosis.
## **Why Each Wrong Option is Incorrect**
- **Option A:** Without specific details on the options, we can infer that conditions not matching the described presentation of conductive hearing loss with a family history and specific audiometric findings would be incorrect.
- **Option B:** Similarly, any condition not aligning with the clinical and audiometric picture provided would not be the correct choice.
- **Option C:** This option is not evaluated as it is the correct answer.
## **Option D:**
Assuming this option represents a different diagnosis, such as sensorineural hearing loss or Meniere's disease, these conditions would not typically present with conductive hearing loss patterns or the specific bone conduction abnormalities seen in otosclerosis.
## **Clinical Pearl / High-Yield Fact**
A key point to remember is that **otosclerosis** often presents with a conductive hearing loss and can have a familial predisposition. The presence of Carhart's notch, which is an apparent bone conduction hearing loss at 2000Hz, is a critical audiometric finding that supports this diagnosis. This condition is also more common in women, which aligns with the patient's profile.
## **Correct Answer: C.**