title: Transitional cell carcinoma within a calyceal diverticulum associated with stone disease.
abstract: We report a case of transitional cell carcinoma (TCC) discovered within a calyceal diverticulum at the time of percutaneous nephrolithotomy. The stones and tumor were endoscopically removed and the diverticular cavity fulgurated. Pathologic analysis demonstrated low-grade TCC. A subsequent laparoscopic radical nephroureterectomy was performed and high-grade TCC invading the parenchyma was found. This case demonstrates the potential for TCC to develop in stone-containing calyceal diverticula and also the potential for coexistence of different grades of TCC within the involved renal unit.
authors.affiliation: Department of Urology, Wake Forest University School of Medicine Winston-Salem, NC.
authors.forename: Jack M
authors.initials: JM
authors.lastname: Zuckerman
authors.forename: Corey
authors.initials: C
authors.lastname: Passman
authors.forename: Dean G
authors.initials: DG
authors.lastname: Assimos