Sclerosing otitis media is diagnosed by
**Core Concept**
Sclerosing otitis media, also known as otosclerosis, is a type of bone growth in the middle ear that causes hearing loss. This condition is characterized by abnormal bone remodeling in the otic capsule, leading to fixation of the stapes bone and conductive hearing loss.
**Why the Correct Answer is Right**
The diagnosis of sclerosing otitis media typically involves a combination of clinical evaluation, otoscopy, and imaging studies. A key diagnostic feature is the presence of a white or yellowish patch on the promontory, which is often accompanied by a conductive hearing loss. The condition is often associated with a family history, suggesting a genetic predisposition. The most accurate diagnostic tool is a high-resolution computed tomography (CT) scan, which can visualize the abnormal bone growth.
**Why Each Wrong Option is Incorrect**
**Option A:** Pure tone audiometry is a useful tool for assessing hearing thresholds, but it is not specific for diagnosing sclerosing otitis media. It may show a conductive hearing loss, but other conditions can also cause this pattern.
**Option B:** Otoscopy is a crucial part of the physical examination, but it is not sufficient on its own to diagnose sclerosing otitis media. A normal otoscopy does not rule out the condition.
**Option C:** Bone conduction testing can help to differentiate between conductive and sensorineural hearing losses, but it is not a definitive diagnostic test for sclerosing otitis media.
**Clinical Pearl / High-Yield Fact**
It is essential to keep in mind that sclerosing otitis media is often associated with a family history, and a positive family history should raise suspicion for this condition, especially in young adults with conductive hearing loss.
**Correct Answer:** D. High-resolution computed tomography (CT) scan of the temporal bone.