👉 A lymphadenoma is a benign tumor that occurs in the lymph nodes. It arises from the lining of the blood vessels (lymph vessels) and can grow into a solid mass, which resembles a lump or swelling. Lymph adenomas are typically smaller than small cell lung cancer (Lung Cancer), but they can cause symptoms like coughing up blood, fever, fatigue, or difficulty swallowing. They are most common in adults over the age of 40.