This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology and breast, Subject name: Surgery
Most of the incidentalomas are 
Select and explain. 
A. Non-functioning adenoma, B. Adrenocoical carcinoma, C. Adrenal metastasis, D. Pheochromocytoma
A: Non-functioning adenoma
Answer: A: Non-functioning adenoma 
Explanation: An incidentaloma is an adrenal mass, detected incidentally by imaging studies conducted for other reasons, not known previously to have been present or causing symptomsMore than 75% are non-functioning adenomas but Cushing's adenomas, phaeochromocytomas, metastases, adrenocoical carcinomas and Conn's tumours can all be found this wayRef: Bailey and Love 27e pg: 839