A benign nerve sheath tumor composed of Schwann cells, occurring in the ureter. The disease is Monarch Disease Ontology entry MONDO_0001400 (schwannoma of ureter). Also known as: neurilemmoma of the ureter, neurilemmoma of ureter, schwannoma of the ureter, ureter neurilemmoma, ureter schwannoma, ureteral neurilemmoma, ureteral schwannoma.