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Symptomatic ring-shaped lateral meniscus. MRI findings

Nikolaos E Koukoulias1, Stergios G Papastergiou

  • 1Orthopaedics Department, Agios Pavlos General Hospital, Thessaloniki, Greece. nkoukoulias@yahoo.gr

BMJ Case Reports
|June 7, 2012
PubMed

Insights

A rare ring-shaped lateral meniscus, often asymptomatic and difficult to diagnose with MRI, was identified in a teenage girl alongside a meniscal cyst. This case highlights MRI

Area of Science:

  • Orthopedics
  • Radiology
  • Sports Medicine

Background:

  • Ring-shaped lateral meniscus is a rare condition, typically asymptomatic.
  • Diagnosis often relies on arthroscopy, as MRI interpretation can be challenging.
  • Previous literature has not established MRI's utility for diagnosing this condition.

Observation:

  • A 16-year-old female presented with symptoms suggestive of meniscal pathology.
  • MRI revealed a cyst originating from the lateral meniscus with internal tissue mimicking a displaced fragment.
  • The presentation mimicked a bucket-handle tear, a common meniscal injury.

Findings:

  • The MRI findings were interpreted as a ring-shaped lateral meniscus with an associated meniscal cyst.
  • This combination is unusual, as meniscal cysts are not typically associated with bucket-handle tears.
  • Arthroscopic examination confirmed the diagnosis of a ring-shaped lateral meniscus and intra-articular cyst.

Implications:

  • This case suggests MRI can be valuable in diagnosing ring-shaped lateral meniscus when combined with meniscal cysts.
  • Accurate diagnosis via MRI can guide appropriate arthroscopic surgical planning.
  • Arthroscopic partial lateral meniscectomy and cyst debridement provided successful treatment for the patient.

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