Bodies in chromoblastomycosis –
**Core Concept**
Chromoblastomycosis is a chronic fungal infection of the skin and subcutaneous tissue, characterized by the presence of distinctive pigmented structures called sclerotic bodies (also known as muriform or Medlar bodies). These bodies are formed by the accumulation of melanin and other pigments within the fungal cells, leading to their characteristic brown or black color.
**Why the Correct Answer is Right**
The correct answer is related to the pathogenesis of chromoblastomycosis. Sclerotic bodies are formed as a result of the interaction between the fungal cells and the host's immune system. The fungi, particularly species of Fonsecaea, Phialophora, and Cladophialophora, secrete enzymes that break down the host's collagen and elastin, leading to the formation of these pigmented structures. The presence of sclerotic bodies is a hallmark of chromoblastomycosis and is often used for its diagnosis.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not correctly identify the characteristic structure associated with chromoblastomycosis.
**Option B:** This option is incorrect because it refers to the histopathological appearance of other fungal infections, not chromoblastomycosis.
**Option C:** This option is incorrect because it refers to the clinical presentation of a different condition, not chromoblastomycosis.
**Clinical Pearl / High-Yield Fact**
Chromoblastomycosis is a chronic fungal infection that requires prolonged treatment, often with itraconazole or terbinafine. The presence of sclerotic bodies is a key diagnostic feature, and their identification can help differentiate chromoblastomycosis from other fungal infections.
**Correct Answer: D. Sclerotic bodies**