Arthroscopic management of a rare free-edge medial meniscal cyst: A case report

Figure 1  No obvious abnormalities were detected on X-ray imaging.

Figure 2  The magnetic resonance T2-weighted image shows a torn and flipped medial meniscus (indicated by the white asterisks) and a meniscus cyst is located on the free-edge of the flipped medial meniscus (indicated by the yellow arrow).

Figure 3 Arthroscopic view through the anterolateral approach of the left knee reveal that the medial meniscus has an oblique tear forming a flipped flap (indicated by the black asterisks), combined with a free-edge cyst (indicated by the blue arrow). mFC: Medial femoral condyle; mTP: Medial tibial plateau.

Figure 4 The resected portion of the meniscus during surgery. The black asterisks indicates an oblique tear of the meniscus, and the blue arrow points to a cyst at the free edge of the meniscus.

Figure 5  Pathological hematoxylin and eosin staining of the cyst tissue section reveals a typical cyst wall.