Figure 2. A 36-year-old male with acute knee injury. (a) Sagittal T₂ weighted image of the left knee joint reveals an anomalous insertion of the medial meniscus (AIMM; arrows) attached to the middle portion of the. At the tibial attachment site of the AIMM, it mimics a tear of the anterior horn of the medial meniscus (arrowhead). (b) Sagittal T₂ weighted image of the contralateral right knee joint also shows an AIMM with a high-signal-intensity gap between the AIMM (arrowheads) with the fan-shaped meniscal insertion (arrows). (c) The arthroscopy from the lateral portal view shows that the AIMM covers the anterior margin of the anterior cruciate ligament (ACL) in the left knee joint.