A benign or malignant neoplasm that affects the ureter. The disease is Monarch Disease Ontology id MONDO_0021111 (ureter neoplasm). Also known as: neoplasm of the ureter, neoplasm of ureter, neoplasms of the ureter, neoplasms of ureter, tumor of the ureter, tumor of ureter, tumour of the ureter, tumour of ureter.