disease arises from structure disease arises from alteration in structure bladder urothelial cell papilloma transitional cell papilloma https://www.malacards.org/card/transitional_papilloma ICDO:8120/0 MEDGEN:137734 EFO:0006497 DOID:2670 MONDO:0005605 papilloma, transitional cell, benign NCIT:C4115 transitional cell papilloma, benign (morphologic abnormality) UMLS:C0334266 transitional cell papilloma NOS (morphologic abnormality) A benign papillary neoplasm composed of transitional cells which show preservation of the nuclear polarity. urinary bladder urothelium