This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gynaecological Disorders in Obs., Subject name: Gynaecology & Obstetrics
Adenoacanthoma is which type of uterine cancer? 
Select and explain. 
A. Poorly differentiated adenocarcinoma, B. Well differentiation Adenocarcinoma, C. Mucinous carcinoma, D. Papillary serous carcinoma
B: Well differentiation Adenocarcinoma
Answer: B: Well differentiation Adenocarcinoma 
Explanation: Ans. B. Well differentiation AdenocarcinomaBetween 75 and 80% of all endometrial carcinomas are adenocarcinomas, and the prognosis depends on stage, histologic grade, and extent of myometrial invasion. Grade I tumors are highly differentiated adenocarcinomas, grade II tumors contain some solid areas, and grade III tumors are largely solid or undifferentiated. Adenocarcinoma with squamous differentiation is seen in 10% of patients; the most differentiated form is known as adenoacanthoma, and the poorly differentiated form is called adenosquamous carcinoma. Other less common pathologies include mucinous carcinoma (5%) and papillary serous carcinoma (<10%).