Spherule is a feature of which of the following fungus
**Core Concept**
Histopathological examination of fungal infections reveals distinct microscopic features that aid in identification. Spherules are a characteristic microscopic feature of certain fungal infections, particularly those caused by coccidioides and histoplasma species. These structures are formed by the fungus and are crucial for diagnosis.
**Why the Correct Answer is Right**
Spherules are thick-walled, spherical structures that contain endospores, which are released when the spherule ruptures. This process is a key feature of coccidioidomycosis, caused by *Coccidioides immitis* and *Coccidioides posadasii*. The spherules are formed within the host's macrophages, where the fungus grows and multiplies. The released endospores then infect other cells, leading to the spread of the infection.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not specify a fungus that forms spherules. Other fungi, such as *Blastomyces dermatitidis*, form different microscopic structures, like broad-based budding yeast.
* **Option B:** This option is incorrect because it does not match the characteristic microscopic feature of the fungus in question. Spherules are not a feature of *Aspergillus* species, which form hyphae and conidia instead.
* **Option D:** This option is incorrect because it does not accurately describe the microscopic feature of the fungus in question. Spherules are not a feature of *Cryptococcus neoformans*, which forms encapsulated yeast cells.
**Clinical Pearl / High-Yield Fact**
Coccidioidomycosis is a significant fungal infection in certain regions of the United States, particularly in the southwestern states. It can cause respiratory symptoms, such as pneumonia, and can also spread to other parts of the body, including the skin, bones, and central nervous system.
**Correct Answer: C. Coccidioides**