Figure 2 The surgical procedure and postoperative imaging data(A) Establishing the medial high-level channel through the light spot; (B) Expose the posterior medial compartment of the knee joint; (C) Use a gouge to excise the posterior medial portion of the joint capsule, exposing the inner head of the gastrocnemius muscle; (D) Expose the inner head of the gastrocnemius muscle; (E) Expose the drainage opening between the gastrocnemius and semimembranosus muscles; (F) Under the arthroscope, the cyst wall of the popliteal cyst and yellowish fluid within the cyst are observed; (G) The cyst wall is completely excised, and the drainage opening is enlarged postoperatively; (H, I) MRI cross-sectional and sagittal views: Postoperative review reveals excision of the cyst.