PMC3792540_01
Clinical photograph.
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fig1
On physical examination, there were fullness on the medial aspect of left knee and palpable nodular mass of approximately 6 x 4 cm over the infrapatellar region medial to the patellar tendon (Figure 1).
Preoperative X-ray.
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fig2
The femoral condyles and tibial plateau were normal (Figures 2(a) and 2(b)).
MRI of left knee.
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fig3
MRI was performed. MRI revealed a large mineralized mass lying in the Hoffa body with no attachment to the skeletal tissue (Figure 3).
Intraoperative findings. (a) Tumour medial to the patellar tendon and (b) tumour impaling medial femoral condyle.
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fig4
The mass was lying medially and behind the patellar tendon in Hoffa's fat pushing the tendon laterally (Figure 4(a)) and impinging on medial femoral condyle and intercondylar notch (Figure 4(b)).
Excised mass in toto.
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fig5
It was dissected and excised in toto (Figures 5(a) and 5(b)).
Histopathology: This figure shows bone marrow, bone and cartilage with fibrofatty tissue at the periphery.
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fig6
Fibrofatty tissue was seen at the periphery (Figure 6).
Two-year followup. (a) Clinical photograph and (b) radiology showing no recurrence.
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fig7
When last reviewed 24 months after excision, she was asymptomatic with no clinical and radiographic signs of recurrence of the lesion (Figures 7(a), 7(b)(1), and 7(b)(2)).