👉 Cystadenoma is a benign tumor that arises from the epithelial lining of the small intestine (cysts). It can be either smooth or rough, and it usually appears in the lower left quadrant of the abdomen. Cystadenomas are often asymptomatic, but they can become more noticeable as they grow larger. The term "cystoadenoma" is derived from the Greek words "catechoid" (meaning cyst) and "adeno" (from Latin meaning gland).