C77: Secondary and unspecified malignant neoplasm of lymph nodes

Secondary and unspecified malignant neoplasm of lymph nodes refers to a group of medical conditions where cancer cells develop in a body's lymph nodes, which are small, bean-shaped organs that produce and store cells that fight infection and disease. These cells, called lymphocytes, can become abnormal and start to multiply uncontrollably, resulting in a tumor or neoplasm. A secondary neoplasm refers to cancer that originated in another part of the body but spread to the lymph nodes. Whereas unspecified neoplasms are those that have been identified in the lymph nodes, but the origin of the cancer is yet to be determined. Common symptoms can include swelling of the lymph nodes (often in the neck, armpit, or groin), fever, night sweats, unexplained weight loss, and general weakness. The progression of these conditions can depend upon the exact type of cancer, its location, and how much it has spread, affecting different body systems.