Definition: Cystophthisis is a medical condition characterized by an inflamed or swollen lymph node. It is usually caused by an infection of the lymph nodes, and it can also be triggered by certain substances like alcohol, tobacco, or certain medications. The swelling of the lymph nodes may lead to pain, fever, chills, fatigue, and difficulty breathing. If left untreated, cystophthisis can cause complications such as inflammation of the lining of the lungs, which is called pleural effusion