Commonest histology of carcinoma of endometrium is :
**Core Concept**
The question is testing the student's knowledge of the histological types of endometrial carcinoma, which is a common malignancy of the female genital tract. **Endometrial carcinoma** arises from the endometrium, the inner lining of the uterus, and its histological types have significant implications for treatment and prognosis.
**Why the Correct Answer is Right**
The correct answer is **Adenocarcinoma**. The majority of endometrial carcinomas are of adenocarcinomatous type, which arises from the glandular epithelium of the endometrium. This type of cancer is often associated with **estrogen receptor positivity**, which means that the cancer cells have receptors for estrogen hormones. The presence of estrogen receptors has implications for treatment with hormone therapy.
**Why Each Wrong Option is Incorrect**
* **Option A:** Squamous cell carcinoma is a type of cancer that arises from the squamous epithelium, which is not the primary cell type of the endometrium. While it can occur in the endometrium, it is much less common than adenocarcinoma.
* **Option B:** Clear cell carcinoma is a rare type of endometrial cancer that is often associated with a poorer prognosis. However, it is not the most common type of endometrial carcinoma.
* **Option D:** Sarcomas are a type of cancer that arises from the connective tissue of the uterus, rather than the epithelial lining. They are much less common than adenocarcinomas.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that the histological type of endometrial carcinoma has significant implications for treatment and prognosis. Adenocarcinomas are often treated with hormone therapy, while sarcomas require more aggressive treatment approaches.
**Correct Answer:** A. Adenocarcinoma