This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
Psammoma bodies are seen in: 
Select and explain. 
A. Papillary carcinoma of thyroid, B. Follicular carcinoma of thyroid, C. Anaplastic carcinoma of thyroid, D. Lymphoma of thyroid
A: Papillary carcinoma of thyroid
Answer: A: Papillary carcinoma of thyroid 
Explanation: Ans. A: Papillary carcinoma of thyroid A psammoma body is a round collection of calcium, seen microscopically. The term is derived from the Greek word psammos meaning "sand." Psammoma bodies are commonly seen in ceain tumors such as: Papillary thyroid carcinoma Papillary renal cell carcinoma Serous papillary ovarian adenocarcinoma (cystadenocarcinoma) Endometrial adenocarcinomas (Papillary serous carcinoma -3%-4%) Meningioma Mesothelio ma Psammoma bodies usually have a laminar appearance.