Mucinous cystadenoma of a horseshoe kidney: A case report and literature review

Abstract

Original research E30Cite as: Can Urol Assoc J 2015;9(1-2):E30-2. http://dx.doi.org/10.5489/cuaj.2211 Published online January 12, 2015. AbstractA 45-year-old man complained of a palpable mass in his left abdomen. Computed tomography showed a horseshoe kidney with a Bosniak type II complicated cyst from a left segment. Three years after his initial examination, due to the growing cystic lesion and the compression imposed on the urinary collecting system and surrounding organs, we performed a left heminephrectomy. The diagnosis was mucinous cystadenoma of the kidney. No recurrence was observed 6 months after surgery. The histopathology was unique since the inner surface of the cyst was covered by a mucin-positive columnar epithelium connected to a urothelium, with continuous transition between the two. This suggests that the mucinous tumour may have originated from a sequestered segment of the renal pelvic epithelium in the renal parenchyma.

Mucinous Cystadenoma Arising From Renal Pelvis

“…In addition, they also found 5 cases of primary mucinous cystadenocarcinomas of kidney in literature. Mitome T et al 3 reported another case of mucinous cystadenoma in a horseshoe kidney in 2015. Most tumors occurred in native kidney; however, 3 cases of mucinous cystadenoma were occurred in horseshoe kidney 2,5,6 .…”

“…Mucinous cystic neoplasms of kidney are exceedingly rare primary renal neoplasm, with only 22 cases of mucinous cystadenoma and 5 cases of mucinous cystadenocarcinomas have been reported in English literature 1,2 . Mucinous cystadenocarcinomas of renal pelvis was first described in 1956 by Arcadi et al 3 . Because knowledge about renal mucinous cystic neoplasms is extremely limited and they have not been recognized in the WHO classification of tumors of the urinary system and male genital organs 4 .…”

Parenchymal mucinous cystadenoma of the kidney: a case report and literature review

“…Among the previous cases, most of them originated from the urinary collecting system (pelvic MC) and less from renal parenchyma (parenchymal MC), including our case [3,[10][11][12][13][14][15][16][17][18][19]. There are three theories about glandular metaplastic change, including (1) renal maldevelopment, (2) chronic inflammation (or irritation), and (3) celomic epithelium differentiation [6,20].…”

“…There are three theories about glandular metaplastic change, including (1) renal maldevelopment, (2) chronic inflammation (or irritation), and (3) celomic epithelium differentiation [6,20]. Only three MCs and three MCCs were reported in association with maldevelopment [6,8,18]. Some authors suggested that such parenchymal tumors could originate from a sequestrated segment of the renal pelvic epithelium in renal parenchyma in the background of maldevelopment [10,11,18].…”

“…Only three MCs and three MCCs were reported in association with maldevelopment [6,8,18]. Some authors suggested that such parenchymal tumors could originate from a sequestrated segment of the renal pelvic epithelium in renal parenchyma in the background of maldevelopment [10,11,18]. Most cases were associated with chronic irritation secondary to urolithiasis or pyelonephritis [3,13,18].…”