A in situ carcinoma that involves the renal pelvis. The disease is carcinoma in situ of renal pelvis (Monarch Disease Ontology entry MONDO_0021296). Also known as: carcinoma in situ of kidney pelvis, carcinoma in situ of the kidney pelvis, carcinoma in situ of the renal pelvis, kidney pelvis carcinoma in situ, renal pelvis carcinoma in situ, renal pelvis in situ carcinoma, stage 0 renal pelvis carcinoma, stage 0is carcinoma of kidney pelvis.