PMC9999043_01
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).
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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 ).
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).
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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 ).