Baby with recurrent infection of ear & discharge & seborrheic dermatitis with hepatosplenomegaly with cystic skull lesions. Diagnosis is –
**Core Concept**
The question is testing the clinical presentation of a rare genetic disorder characterized by recurrent infections, skin abnormalities, and systemic involvement. This condition is caused by a defect in the immune system, leading to an increased susceptibility to infections.
**Why the Correct Answer is Right**
The patient's symptoms are suggestive of **Chédiak-Higashi Syndrome (CHS)**, a rare genetic disorder caused by mutations in the LYST gene. CHS is characterized by **oxygen-dependent killing defect in neutrophils**, leading to recurrent infections, particularly of the skin, ears, and lungs. The presence of **seborrheic dermatitis** and **hepatosplenomegaly** is also consistent with CHS. The **cystic skull lesions** are a classic feature of this condition.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect as it does not match the clinical presentation described in the question. The symptoms of CHS are not typical of this condition.
* **Option B:** This option is incorrect as it does not account for the systemic involvement and skin abnormalities seen in CHS.
* **Option C:** This option is incorrect as it does not explain the recurrent infections and cystic skull lesions seen in CHS.
**Clinical Pearl / High-Yield Fact**
CHS is a rare genetic disorder that highlights the importance of considering **immunodeficiency** in patients with recurrent infections and unexplained skin abnormalities.
**Correct Answer:** C. Chédiak-Higashi Syndrome