case_images: PMC9999043_01
case_images: Lateral view x-ray of the left knee demonstrating a mass posterior to the fibular head (A). On reconstructed CT, the mass was calcified in the periphery, but the shell was not complete and showed focal interruption (B).
case_images: fonc-13-1024768-g001.jpg
case_images: PMC9999043_01_fonc-13-1024768-g001.jpg
case_images: f1
case_images: X-rays and computed tomography (CT) scans revealed a mass lesion on the posterolateral side of the left knee and the periphery of the mass showed mineralization ( Figure 1 ).
case_images: On T1-weighted imaging (A), the mass shows intermediate signal intensity, while heterogeneously high intensity with fluid-fluid level can be seen on T2-weighted imaging (B). Peripheral and nodular enhancement is recognizable on FS-T1-weighted imaging with contrast (C, D).
case_images: fonc-13-1024768-g002.jpg
case_images: PMC9999043_01_fonc-13-1024768-g002.jpg
case_images: f2
case_images: T1-weighted imaging ( Figure 2A ), while showing heterogeneously high intensity with the fluid-fluid level on T2-weighted imaging ( Figure 2B ). The periphery was enhanced on FS-T1-weighted imaging with contrast ( Figures 2C, D ).