10-Year observation of a rare presentation of pure fibromyxoid nephrogenic adenoma in the renal pelvis

Dong Ren; Chenchen Niu; Katherine Wei; Ibe Ifegwu

doi:10.1016/j.eucr.2023.102601

10-Year observation of a rare presentation of pure fibromyxoid nephrogenic adenoma in the renal pelvis

Urol Case Rep. 2023 Oct 30:51:102601. doi: 10.1016/j.eucr.2023.102601. eCollection 2023 Nov.

Authors

Dong Ren¹, Chenchen Niu¹, Katherine Wei², Ibe Ifegwu¹

Affiliations

¹ Department of Pathology and Laboratory Medicine, University of California Irvine Medical Center, Orange, CA, 92868, USA.
² Department of Radiology, University of California Irvine Medical Center, Orange, CA, 92868, USA.

Abstract

Nephrogenic adenoma (NA) is an unusual benign epithelial tumor in the genitourinary tract. Here we report a fibromyxoid nephrogenic adenoma in a 37-year-old female presenting with over 10-year slow-growing renal pelvic mass that was diagnosed with bland spindle cell lesion in multiple previous biopsies. This is the first reported case of pure fibromyxoid NA in renal pelvis with close comparison and correlation of biopsy and resection findings over a 10-year span. This will enhance awareness of pathologists to consider this unusual entity when examining spindle cell lesions in this setting, and prevent misdiagnosis and overtreatment of a typically benign process.

Keywords: Post procedures; Pure fibromyxoid nephrogenic adenoma; Renal pelvis.

Publication types

Case Reports