What else can cause enlargted retroperitoneaql lymph nodes other than cancer and what are the symptoms++of+an+enlarged+retroperitoneal+lymph+node

Lots of things: I've had one patient with enlarged nodes from a bad kidney infection. Sarcoidosis, tuberculosis, lupus, etc. Can cause abnormal nodes. However, most of the time an enlarged node needs evaluation and possible biopsy. Enlarged nodes usually don't cause much symptoms. Sometimes people get vague abdominal pain or back pain.

Many things: Enlarged retroperitoneal lymph nodes can be caused by different things, not just malignancy - like infection on the adjacent areas- like abscess in kidney or other infection on the retroperitoneal area, inflammation- like in autoimmune disorder/rheumatological disorder, systemic disease like immunodeficiency, viral infections etc.