**Question:** Earliest sign seen in Acoustic neuroma is

A. Facial palsy
B. Sensorineural hearing loss
C. Tinnitus
D. Vertigo

**Core Concept:** Acoustic neuroma, also known as vestibular schwannoma, is a benign tumor that develops from the Schwann cells of the vestibulocochlear nerve (cranial nerve VIII). This nerve is responsible for conveying sensory information related to hearing, balance, and facial expressions.

**Why the Correct Answer is Right:** The correct answer, **B. Sensorineural hearing loss**, is the earliest sign of an acoustic neuroma. Sensorineural hearing loss occurs due to the compression or infiltration of the cochlea and vestibular organs, which are part of the vestibulocochlear nerve. As the tumor grows, it exerts mechanical pressure on the nerve, leading to dysfunction of the inner ear structures and subsequent hearing impairment.

**Why Each Wrong Option is Incorrect:**

A. **Facial palsy** is a later sign in acoustic neuroma progression, typically occurring when the tumor grows large enough to compress or invade the facial nerve nucleus or its branches.

B. **Tinnitus** is a subjective symptom, meaning patients might not even be aware of it unless mentioned by the patient or observed by a healthcare professional. It is usually a later sign in acoustic neuroma development.

C. **Vertigo** is another subjective symptom and usually presents later in the disease process. It is associated with the involvement of the vestibular system, which is part of the vestibulocochlear nerve.

**Why Acoustic Neuroma is Important:** Acoustic neuromas are relatively rare tumors, accounting for approximately 5-10% of all vestibular schwannomas. Early diagnosis is crucial as these tumors can cause progressive hearing loss, tinnitus, vertigo, and facial palsy. Timely intervention can prevent or minimize the severity of these symptoms and avoid complications like facial nerve dysfunction or cerebrospinal fluid leakage.

**Clinical Pearl:** Acoustic neuroma detection often relies on a detailed history taken from the patient, including a comprehensive audiogram and vestibular function tests. MRI or CT scan is the gold standard for imaging these tumors. If suspected, referral to a neuro-otologist is necessary for a definitive diagnosis and management.