• You Chen, Yuqing Shu, Laichang He, and Kaifu Wu.
• Department of Radiology, The First Affiliated Hospital of Nanchang University.
• Medicine (Baltimore). 2021 Feb 26; 100 (8): e24714e24714.

RationalePrimary renal carcinoid tumors are very rare and only about 100 cases have been reported in the medical literature. There are even fewer articles on the imaging manifestations of primary renal carcinoid tumors.Patient ConcernsWe present 3 cases of patients with lumbago and hematuria. These were cases of primary renal carcinoid tumors with initial suspicion of suprarenal epithelioma.DiagnosesRenal lesions were detected on abdomen computed tomography (CT) imaging. The 3 cases presented as solid/cystic solid renal mass with uniform or non-uniform density, calcification in the mass, and enhanced heterogeneity.InterventionsThe laparoscopic partial/radical nephrectomy were performed.OutcomesThe postoperative histological diagnosis were primary renal carcinoid tumors. Case 2 been lost to follow-up in 3 patients, and the other 2 patients (Case 1 and 3) are still alive. Case 1 had intrahepatic metastases.LessonsPrimary renal carcinoid tumors mostly present as solid mass/cystic solid mass with calcification and delayed enhancement of heterogeneity on CT imaging, but the diagnosis depends on pathological diagnosis. Hence, raising awareness of the CT features of the rare tumor in the kidney may broaden the knowledge base of radiologists.Copyright © 2021 the Author(s). Published by Wolters Kluwer Health, Inc.

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