Test yourself question: Left knee pain in a young adult

A young 35-year-old male presented with left knee pain. No prior history of trauma or injury. No past medical or surgical history otherwise. On examination, the patient had tenderness to palpation over the proximal lateral tibia. Range of motion and ligamentous stability were intact Figs. 1, 2, 3, 4, 5 and 6.

Fig. 1figure 1

Antero-posterior (AP) radiograph of the left knee

Fig. 2figure 2

Coronal T1 (A), coronal PD-w (B) fat-saturated MR sequences of left knee

Fig. 3figure 3

Coronal CT images of the left knee

Fig. 4figure 4

Axial CT with biopsy needle within the lesion

Fig. 5figure 5Fig. 6figure 6

A Immediate and B 1-month post-operative radiographs. C Coronal PD-w sequence

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