# A Ring-Shaped Lateral Meniscus in an Anterior Cruciate Ligament Reconstruction Surgery

## TL;DR

A rare ring-shaped lateral meniscus was found during ACL surgery in a young man with knee instability.

## Contribution

This case report highlights the incidental discovery of a rare meniscal variant during ACL reconstruction.

## Key findings

- A ring-shaped lateral meniscus was identified during ACL surgery in a patient with knee instability.
- The anomaly was confirmed through clinical and imaging evaluations prior to surgery.

## Abstract

The ring-shaped meniscus is a rare variant of meniscus anomalies. We report a case of a young man who experienced right knee instability following a sports-related injury. Clinical examination suggested an anterior cruciate ligament (ACL) tear, which was confirmed through imaging studies. Intra-operatively, an incidental finding revealed the presence of a ring-shaped lateral meniscus. We discuss the diagnostic features of this uncommon abnormality.