# Metanephric adenofibroma of the left kidney in an adult patient

## TL;DR

A 29-year-old woman with a rare benign kidney tumor called metanephric adenofibroma underwent successful robotic surgery with no further treatment needed.

## Contribution

This case highlights the rare occurrence of metanephric adenofibroma in an adult, expanding clinical awareness of its presentation and management.

## Key findings

- Metanephric adenofibroma was diagnosed in a 29-year-old female with a left renal mass.
- The patient underwent robotic partial nephrectomy with negative surgical margins and benign histopathology.
- The patient recovered well and does not require further acute follow-up.

## Abstract

Metanephric adenofibroma is a rare, benign renal neoplasm arising from the embryonic metanephric tissue, which would typically give rise to normal kidney parenchyma. Despite classical presentation in pediatric patients, we present a case of a 29-year-old female with 6 months of intermittent left upper quadrant pain found to have a 3.8cm left renal mass, partially extending into the collecting system of the superior pole. The patient underwent robotic partial nephrectomy, and histopathology confirmed a diagnosis of metanephric adenofibroma with negative surgical margins. The patient had an uneventful recovery, and requires no acute follow-up, given the benign nature of her diagnosis.