Collecting duct carcinoma of the kidney: Imaging observations of a rare tumor

Hu,Yuxiao; Lu,Guang‑Ming; Li,Kai; Zhang,Long‑Jiang; Zhu,Hong

doi:10.3892/ol.2013.1739

Collecting duct carcinoma of the kidney: Imaging observations of a rare tumor

Authors:
- Yuxiao Hu
- Guang‑Ming Lu
- Kai Li
- Long‑Jiang Zhang
- Hong Zhu
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Affiliations: Department of Nuclear Medicine, Jinling Hospital, Clinical School of Medical College, Nanjing University, Nanjing, Jiangsu 210002, P.R. China, Department of Medical Imaging, Jinling Hospital, Clinical School of Medical College, Nanjing University, Nanjing, Jiangsu 210002, P.R. China, Department of Pharmacology, Soochow University, Suzhou, Jiangsu 215123, P.R. China
Published online on: December 6, 2013 https://doi.org/10.3892/ol.2013.1739
Pages: 519-524

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Abstract

Collecting duct carcinoma (CDC) is a rare type of renal neoplasm. Early diagnosis is possibly the only factor leading to a prolonged survival for patients with CDC. The purpose of the present study was to characterize the imaging features of CDC and improve its diagnosis. Radiological data of six patients were retrospectively reviewed by three experienced radiologists, including six cases examined with non‑contrast computed tomography (CT) scans, five with contrast‑enhanced CT scans, one with magnetic resonance urography, one with renal dynamic imaging and two with conventional whole‑body 18F‑fluorodeoxyglucose (FDG) positron emission tomography (PET)/CT scans. All patients were pathologically confirmed with CDC. In total, seven tumors were detected in the six cases, with a mean size of 5.3 cm. Of the tumors, two were solid and the rest were complex solid and cystic. In addition, six tumors were located in medullary areas and only one tumor was found in the cortical location. Cystic components were observed in five tumors. Weak enhancements were observed in all six tumors examined with contrast‑enhanced CT, and heterogeneous enhancements were also observed in the majority of these tumors with the exception of one tumor. Infiltrative growth and expansible growth were found in five and two tumors, respectively. Metastatic lesions were detected in all six patients. On MR urography, the involved kidney exhibited similar imaging observations to the CT scan. Renal dynamic imaging revealed a decreased renal function in the involved kidney and an increased renal function in the contralateral kidney. On PET/CT imaging, a marked uptake of 18F‑FDG was found in primary and metastatic lesions. The results of the present study indicated that medullary location, weak and heterogeneous enhancement, infiltrative growth, damage of renal function in the involved kidney and a marked uptake of 18F‑FDG are imaging observations commonly identified in patients with CDC. When a renal tumor exhibits these imaging features, CDC may be suggested as a valuable differential diagnosis.

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