Mucinous cystadenoma is a type of benign tumor that primarily occurs in the ovaries. It is characterized by the presence of mucin, a gel-like substance, within cystic spaces. These tumors can vary in size and may be asymptomatic, but larger cystadenomas can cause abdominal discomfort or pressure. Although mucinous cystadenomas are non-cancerous, they can sometimes be mistaken for malignant tumors during imaging studies. Diagnosis typically involves imaging techniques like ultrasound or CT scans, and treatment usually requires surgical removal to prevent complications and ensure accurate diagnosis.