**Question:** Which of the following is the earliest symptom of acoustic neuroma?

A. Facial nerve weakness (House-Brackmann scale)
B. Tinnitus
C. Presbycusis (age-related hearing loss)
D. Vertigo

**Core Concept:** Acoustic neuroma is a benign tumor originating from the Schwann cells of the vestibular branch of the eighth cranial nerve (Vestibulocochlear nerve) and can lead to various symptoms due to compression and irritation of the surrounding structures.

**Why the Correct Answer is Right:** The correct answer, **D. Vertigo**, is the earliest symptom of acoustic neuroma because it is caused by compression of the vestibular nerve, which is part of the eighth cranial nerve. Vertigo is a common symptom in acoustic neuroma patients, characterized by a sensation of spinning or dizziness.

**Why Each Wrong Option is Incorrect:**

A. **Facial nerve weakness (House-Brackmann scale)**: Facial nerve weakness may develop later in the disease progression, particularly as the tumor grows larger and compresses the facial nerve. The House-Brackmann scale is a grading system for facial nerve function assessment.

B. **Tinnitus**: While tinnitus can occur in acoustic neuroma patients, it is typically not the initial symptom. Tinnitus refers to the sensation of ringing or buzzing in the ears, often caused by other underlying issues.

C. **Presbycusis (age-related hearing loss)**: Presbycusis is a normal age-related hearing loss, unrelated to the presence of an acoustic neuroma. It is caused by the degeneration of sensory hair cells in the inner ear, usually affecting both ears.

**Clinical Pearl:** Acoustic neuromas are benign tumors that can affect the balance and hearing functions due to compression of the vestibulocochlear nerve. Facial nerve weakness (House-Brackmann scale) is a later sign of tumor growth, while tinnitus and presbycusis are not the earliest symptoms of the disease. Vertigo is the most common and early symptom, affecting the vestibular system.