Abnormal band of lateral meniscus

Area of Science:

• Orthopedics
• Anatomy
• Radiology

Background:

• Anatomical variants of the meniscus can impact knee function and diagnosis.
• Aberrant lateral meniscus patterns are infrequently reported in medical literature.

Observation:

• A case report details an unusual "abnormal band" of the lateral meniscus in a 45-year-old male patient.
• This aberrant meniscus extended from the posterior horn to the antero-mid portion of the true lateral meniscus and was freely mobile.
• Preoperative examination suggested medial meniscal pathology, but MRI revealed the anomalous lateral meniscus.

Findings:

• This specific anatomical pattern of the lateral meniscus is exceedingly rare, with only one prior report in Asian patients.
• The case presents a non-Asian individual with this rare variant and a distinct clinical presentation.
• Magnetic resonance imaging (MRI) was crucial in identifying the anomalous lateral meniscus, which was not clinically suspected.

Implications:

• This case expands the understanding of lateral meniscus anatomical variations beyond previously reported demographics.
• Clarifying definitions of aberrant meniscus types is essential for accurate reporting and diagnosis.
• Further research into these rare variants can improve diagnostic accuracy and patient management in knee injuries.