Bilateral facial palsy is seen in: September 2012
**Core Concept**
Bilateral facial palsy is a condition characterized by the paralysis of both facial nerves, leading to weakness or inability to control facial muscles on both sides of the face. This condition can result from various causes, including infections, trauma, and autoimmune diseases.
**Why the Correct Answer is Right**
In Ramsay Hunt syndrome type 2, also known as herpes zoster oticus, the varicella-zoster virus reactivates and infects the geniculate ganglion, leading to inflammation of the facial nerve and resulting in bilateral facial palsy. The virus can also cause vesicular eruptions in the external auditory meatus and ear canal. The condition can be unilateral or bilateral, depending on the extent of nerve involvement.
**Why Each Wrong Option is Incorrect**
**Option A:** Bell's palsy is a unilateral condition, typically affecting one side of the face. It is characterized by idiopathic inflammation of the facial nerve.
**Option B:** Lyme disease can cause facial palsy, but it is usually unilateral and not bilateral.
**Option C:** Melkersson-Rosenthal syndrome is a rare condition characterized by recurrent facial paralysis, but it is typically unilateral and not bilateral.
**Clinical Pearl / High-Yield Fact**
Bilateral facial palsy can be a sign of a more serious underlying condition, such as Lyme disease or Ramsay Hunt syndrome type 2, and requires prompt medical evaluation to determine the underlying cause and initiate appropriate treatment.
**Correct Answer: D. Ramsay Hunt syndrome type 2**