A child presents with seborrheic dermatitis, lytic skull lesions, ear discharge and hepatosplenomegaly; likely diagnosis:
**Core Concept**
The clinical presentation suggests a multisystem disorder involving the skin, bones, ears, and lymphoreticular system, pointing towards an underlying **immunodeficiency** or **infectious** etiology. **Seborrheic dermatitis**, **lytic skull lesions**, and **hepatosplenomegaly** are key findings.
**Why the Correct Answer is Right**
Given the combination of **seborrheic dermatitis**, **lytic skull lesions**, **ear discharge**, and **hepatosplenomegaly**, the likely diagnosis is **Histoplasmosis**, particularly in an **immunocompromised** host. This fungal infection can disseminate and affect multiple systems.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect as it doesn't match the provided clinical picture.
**Option B:** Incorrect, not specified but typically wouldn't fit this broad range of symptoms.
**Option C:** Incorrect, not provided but usually wouldn't encompass all these findings.
**Clinical Pearl / High-Yield Fact**
In **Histoplasmosis**, **seborrheic dermatitis**-like skin lesions and **lytic bone lesions** can occur, especially in disseminated disease, making it a **great mimic** of other conditions.
**Correct Answer:** D. Histoplasmosis.