Case Report
Copyright ©The Author(s) 2021. Published by Baishideng Publishing Group Inc. All rights reserved.
World J Clin Cases. Jul 26, 2021; 9(21): 6026-6031
Published online Jul 26, 2021. doi: 10.12998/wjcc.v9.i21.6026
Primary follicular lymphoma in the renal pelvis: A rare case report
Xun-Ze Shen, Chen Lin, Fang Liu
Xun-Ze Shen, Chen Lin, PET/CT Center, Shaoxing People's Hospital (Shaoxing Hospital, Zhejiang University School of Medicine), Shaoxing 312000, Zhejiang Province, China
Fang Liu, Department of Pathology, Shaoxing People's Hospital (Shaoxing Hospital, Zhejiang University School of Medicine), Shaoxing 312000, Zhejiang Province, China
Author contributions: Shen XZ designed the research; Shen XZ and Lin C wrote the paper; Liu F provided and analyzed the pathological images; all authors have read and approved the final version of the manuscript.
Supported by the Key Laboratory of Functional Molecular Imaging of Tumor and Interventional Diagnosis and Treatment of Shaoxing City.
Informed consent statement: All study participants, or their legal guardian, provided informed written consent prior to study enrollment.
Conflict-of-interest statement: The authors declare that they have no conflicts of interest.
CARE Checklist (2016) statement: The authors have read the CARE Checklist (2016), and the manuscript was prepared and revised according to the CARE Checklist (2016).
Open-Access: This article is an open-access article that was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution NonCommercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/Licenses/by-nc/4.0/
Corresponding author: Xun-Ze Shen, MS, Chief Physician, PET/CT Center, Shaoxing People's Hospital (Shaoxing Hospital, Zhejiang University School of Medicine), 568 Zhongxing North Road, Shaoxing 312000, Zhejiang Province, China. shenxunze@163.com
Received: March 18, 2021
Peer-review started: March 18, 2021
First decision: April 23, 2021
Revised: May 1, 2021
Accepted: May 20, 2021
Article in press: May 20, 2021
Published online: July 26, 2021
Abstract
BACKGROUND

Follicular lymphoma (FL) is more common in lymph nodes, while primary extranodal lymphomas are rare. Urinary tract lymphoid neoplasms are extremely rare, accounting for less than 5% of all extranodal lymphomas. Only one case of FL from the renal pelvis has previously been reported.

CASE SUMMARY

A 70-year-old male patient with a history of esophageal cancer visited our hospital for follow-up examination. Abdominal computed tomography revealed a malignant mass in the right renal pelvis. The whole-body positron emission tomography/computed tomography showed a significant increase in fluorodeoxyglucose uptake of this soft tissue mass and no abnormal fluorodeoxyglucose uptake in the esophageal wall. The patient underwent radical resection of a malignant tumor in the right kidney, which was confirmed by postoperative pathology to be FL. The patient received no radiation or chemotherapy after surgery, and no recurrence of lymphoma or other malignant tumors was found at the 1-year follow-up.

CONCLUSION

Extranodal FL is more common in the skin and gastrointestinal tract but rarely occurs in the urinary tract. This is the second report of primary renal FL. Localized extranodal FL is expected to have a favorable prognosis and can be cured by local resection.

Keywords: Lymphoma, Follicular lymphoma, Renal pelvis, Imaging, Resection, Case report

Core Tip: Follicular lymphoma (FL) is more common in lymph nodes, while primary extranodal lymphomas are rare. Urinary tract lymphoid neoplasms are extremely rare, accounting for less than 5% of all extranodal lymphomas. We reported a rare case of primary FL of the renal pelvis in a 70-year-old man with a history of esophageal cancer, which was treated with surgery. Localized extranodal FL is expected to have a favorable prognosis and can be cured by local resection.