Journal List > J Korean Soc Radiol > v.75(1) > 1087730

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Joo, Kim, Kim, and Choe: Primary Renal Carcinoid Tumor Mimicking Non-Clear Cell Renal Cell Carcinoma: A Case Report
Uroradiology
Case Report

Journal of the Korean Society of Radiology 2016; 75(1): 37-40.

Published online: 1 July 2016

DOI: https://doi.org/10.3348/jksr.2016.75.1.37

Primary Renal Carcinoid Tumor Mimicking Non-Clear Cell Renal Cell Carcinoma: A Case Report

Leehi Joo, MD1, See Hyung Kim, MD1, Mi Jeong Kim, MD1, Misun Choe, MD2

1Department of Radiology, Keimyung University School of Medicine, Dongsan Medical Center, Daegu, Korea.

2Department of Pathology, Keimyung University School of Medicine, Dongsan Medical Center, Daegu, Korea.

Corresponding author: See Hyung Kim, MD. Department of Radiology, Keimyung University School of Medicine, Dongsan Medical Center, 56 Dalseong-ro, Jung-gu, Daegu 41931, Korea. Tel. 82-53-250-7770, Fax. 82-53-250-7766, kseehdr@dsmc.or.kr

Received 30 November 2015       Revised 4 March 2016       Accepted 4 April 2016

Copyright © 2016 The Korean Society of Radiology

(open-access):

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Carcinoid tumors are neoplasms with neuroendocrine differentiation, and they are most commonly found in the gastrointestinal and respiratory systems. Primary renal carcinoid tumor has rarely been reported. Here, we present a case of primary renal carcinoid tumor manifesting as a small but a gradually enhancing mass with calcification and a cystic component.

Keywords: Renal Neoplasms, Carcinoid Tumor, Ultrasonography, CT

Figures and Tables

Fig. 1

A 55-year-old male with primary renal carcinoid tumor.

A-C. USG findings show a slightly heterogeneous echogenic mass with focal highly echogenic foci and a cystic portion in the left renal cortex.
D-F. Axial images of the dynamic abdominal CT scans demonstrate a well-circumscribed round mass (approximately 45 × 41 mm in size) with focal calcifications and a cystic component. The mass was nearly iso-attenuated (33 HU) on a pre-contrast image (D), and it showed gradual enhancement, 53 HU on the corticomedullary phase image (E), and 83 HU on the excretory phase image (F).
G. Gross specimen of the mass shows a well circumscribed mass, measuring 4.0 × 3.9 × 2.5 cm in size. The mass is located in the upper pole cortex of the left kidney and shows direct invasion into perinephric tissue (arrow).
H. The tumor cells exhibit a characteristic ribbon-like pattern (hematoxylin and eosin stain, × 200).
CT = computed tomography, HU = Hounsfield unit, USG = ultrasonography
jksr-75-37-g001

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