Lepra cells found in lepromatous leprosy are ?
**Core Concept**
Lepra cells are a type of histiocyte that accumulates in the skin and other tissues of patients with lepromatous leprosy, a form of leprosy characterized by a strong immune response and the presence of large numbers of Mycobacterium leprae bacteria. These cells play a key role in the pathogenesis of the disease by contributing to the granulomatous inflammation and tissue damage.
**Why the Correct Answer is Right**
Lepra cells, also known as foamy histiocytes, are filled with lipid-laden vacuoles that contain the ingested Mycobacterium leprae bacteria. This characteristic foamy appearance is due to the accumulation of lipid droplets within the cells, which is a result of the breakdown of the bacterial cell wall components. The presence of lepra cells is a hallmark of lepromatous leprosy and is used as a diagnostic criterion in the clinical evaluation of patients with suspected leprosy.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the correct term for lepra cells is foamy histiocytes, not epithelioid cells.
* **Option B:** This option is incorrect because lepra cells are not a type of lymphocyte, but rather a type of histiocyte that accumulates in the tissues.
* **Option C:** This option is incorrect because lepra cells are not a type of neutrophil, but rather a type of macrophage that has ingested the Mycobacterium leprae bacteria.
**Clinical Pearl / High-Yield Fact**
Lepra cells are typically found in the skin and other tissues of patients with lepromatous leprosy, and their presence is a strong indicator of the disease. The presence of lepra cells can be confirmed through histopathological examination of a skin biopsy or other tissue sample.
**Correct Answer: C. Foamy histiocytes**