True about vestibular schwannoma:M U/l hearing loss is common presentation Mostly malignant Most common tumour of CP angle Sensorineural deafness Uncapsulated
## **Core Concept**
Vestibular schwannomas, also known as acoustic neuromas, are benign tumors arising from the Schwann cells of the vestibular nerve, which is responsible for balance. These tumors are typically found at the cerebellopontine angle (CP angle), where the vestibular nerve and other cranial nerves emerge from the brainstem.
## **Why the Correct Answer is Right**
The correct answer, **C. Most common tumour of CP angle**, is accurate because vestibular schwannomas are indeed the most common tumors found at the cerebellopontine angle. They are benign, slow-growing tumors that can cause symptoms such as unilateral hearing loss, tinnitus, and balance problems due to their location and effect on the vestibulocochlear nerve.
## **Why Each Wrong Option is Incorrect**
- **Option A: U/l hearing loss is common presentation**. While it's true that unilateral hearing loss can be a presentation of vestibular schwannoma, it's not exclusively a common presentation; other symptoms like tinnitus and balance issues are also common. However, this statement isn't fundamentally incorrect but let's evaluate all options.
- **Option B: Mostly malignant**. This is incorrect because vestibular schwannomas are typically benign (non-cancerous) tumors. Malignant transformation is extremely rare.
- **Option D: Sensorineural deafness**. This option is correct in that vestibular schwannomas can cause sensorineural hearing loss due to their impact on the vestibulocochlear nerve. However, the question seeks the most accurate and broadly correct statement.
- **Option E: Uncapsulated**. This is incorrect because schwannomas are typically encapsulated tumors.
## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that vestibular schwannomas are associated with **Neurofibromatosis type 2 (NF2)**, a genetic disorder characterized by the development of multiple schwannomas, meningiomas, and ependymomas. The majority of vestibular schwannomas, however, occur sporadically without any syndromic association.
## **Correct Answer: C. Most common tumour of CP angle**