filling defect in renal collecting system

• transitional cell carcinoma
• blood clot
• lucent calculus (urate)

less common causes:

• fungus ball
• sloughed papilla
• fibroepithelial polyp
• invasion by hypernephroma
• malakoplakia
• vessel impression
• metastases

© 2002, C.E. Kahn, Jr.
2002-04-18