Most common extra-cutaneous manifestation of chicken pox in children is:
**Core Concept**
Chickenpox, caused by the varicella-zoster virus, can have various extracutaneous manifestations in children, which are a result of the systemic spread of the virus. The most common of these manifestations involve the central nervous system and the hematological system.
**Why the Correct Answer is Right**
The most common extracutaneous manifestation of chickenpox in children is cerebellar ataxia. This occurs due to the presence of the virus in the cerebrospinal fluid, leading to an inflammatory response in the central nervous system. The virus also affects the hematological system, resulting in thrombocytopenia and leukopenia. The cerebellar ataxia is thought to be caused by the inflammation of the cerebellum, leading to impaired coordination and balance.
**Why Each Wrong Option is Incorrect**
**Option A:** Meningoencephalitis is a rare but severe manifestation of chickenpox, whereas cerebellar ataxia is more common.
**Option B:** Encephalitis is another serious complication of chickenpox, but it is not the most common extracutaneous manifestation.
**Option C:** Hepatitis is a possible extracutaneous manifestation of chickenpox, but it is not as common as cerebellar ataxia.
**Clinical Pearl / High-Yield Fact**
It is essential to recognize the extracutaneous manifestations of chickenpox, particularly cerebellar ataxia, as they can be a sign of a more severe infection. Patients with these manifestations may require hospitalization and supportive care.
**Correct Answer: C. Cerebellar ataxia.**