MONDO_0003776 (renal pelvis inverted papilloma) is a neoplasm of the renal pelvis in which the epithelial cells grow downward into the underlying supportive tissue. Also known as: inverted papilloma of kidney pelvis, inverted papilloma of renal pelvis, inverted papilloma of the kidney pelvis, inverted papilloma of the renal pelvis, kidney pelvis inverted papilloma.