**Question:** Bilateral facial nerve palsy is seen in

A. Bell's palsy
B. Ramsay Hunt syndrome
C. Herpes zoster oticus
D. Lyme disease

**Correct Answer:** B. Ramsay Hunt syndrome

**Core Concept:**
Bilateral facial nerve palsy refers to the condition where both sides of the facial nerve are affected, causing weakness or paralysis on both sides of the face. The facial nerve, also known as the seventh cranial nerve, is responsible for controlling the muscles involved in facial expressions.

**Why the Correct Answer is Right:**
Bilateral facial nerve palsy in the context of the given options is primarily associated with Ramsay Hunt syndrome (RHS). RHS is a complication of herpes zoster infection (shingles) involving the seventh cranial nerve. The syndrome is named after Sir Henry Ramsay Hunt Jr., a British neurologist who first described it in 1907.

**Why Each Wrong Option is Incorrect:**
A. Bell's palsy (House-Brackmann grade VI) is a unilateral (on one side) facial nerve palsy caused by viral infections, particularly herpes simplex virus. It is usually self-limiting and resolves within a few weeks.

B. Ramsay Hunt syndrome is a combination of Ramsay Hunt virus infection and peripheral facial palsy; therefore, it cannot cause bilateral facial palsy.

C. Herpes zoster oticus is a viral infection affecting the ear, but it is not directly associated with bilateral facial palsy. Instead, it causes symptoms related to the vestibulocochlear nerve (eighth cranial nerve) and its related structures.

D. Lyme disease is a bacterial infection caused by the bacterium Borrelia burgdorferi, primarily affecting the cardiovascular, nervous, and musculoskeletal systems. It is not associated with bilateral facial palsy.

**Clinical Pearl:**
Ramsay Hunt syndrome is a crucial diagnosis to consider in patients presenting with bilateral facial palsy, as it is associated with a serious complication of herpes zoster infection. Prompt diagnosis and treatment can prevent further complications and improve patient outcomes.