malignant renal pelvis neoplasm (MONDO_0044919, a Monarch Disease Ontology entry) is a primary or metastatic malignant neoplasm that affects the renal pelvis. Also known as: cancer of renal pelvis, malignant neoplasm of renal pelvis, malignant neoplasm of the renal pelvis, malignant renal pelvis tumor, malignant renal pelvis tumour, malignant tumor of renal pelvis, malignant tumor of the renal pelvis, malignant tumour of renal pelvis.