{Reference Type}: Journal Article
{Title}: Invasive urothelial carcinoma within a calyceal diverticulum associated with renal stones: A case report.
{Author}: Nakano T;Kitagawa Y;Izumi K;Ikeda H;Namiki M;
{Journal}: Oncol Lett
{Volume}: 10
{Issue}: 4
{Year}: Oct 2015
{Factor}: 3.111
{DOI}: 10.3892/ol.2015.3590
{Abstract}: Calyceal diverticula are rare outpouchings of the upper collecting system lying within the renal parenchyma. These often contain stones, however, carcinoma within a calyceal diverticulum is uncommon. The present study reports a case of invasive urothelial carcinoma within a calyceal diverticulum associated with renal stones. A 70-year-old male with a left renal mass identified by abdominal computed tomography was referred to the Department of Urology, Kanazawa University Hospital. Pre-operative diagnosis was difficult owing to an atypical imaging finding of a hypovascular renal mass with calcification. A laparoscopic nephroureterectomy was performed, and the surgical specimens showed invasive high-grade urothelial carcinoma within a calyceal diverticulum, and the calcifications were renal stones consisting of 97% calcium oxalate. Urothelial carcinoma in calyceal diverticula is a rare condition, however, a pre-operative definite diagnosis is difficult and a high potential for invasion of the renal parenchyma is suspected in this disease.