PMC2852780_01
Case1. Plain radiograms of the proximal femur revealed a mixed sclerotic and lytic intramedullary lesion with the periosteal perpendicular spiculation with extensive periosteal reaction and "Codman's triangle" reaction.
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F1
Plain radiograms of the proximal femur revealed a mixed sclerotic and lytic intramedullary lesion with extensive periosteal reaction (Figure 1).
Case1. (A) MRI revealed an isointense lesion within the quadriceps femoris muscle on T1-weighed images. (B) T2-weighed images showed a heterogenous hyperintense lesion. (C) The lesion was enhanced heterogeneously on fat-suppressed T1-weighed images after gadolinium injection.
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F2
The lesion was enhanced heterogeneously on fat-suppressed T1-weighted images after gadolinium injection. T2-weighted images also showed a heterogeneous hyperintense lesion (Figure 2).
Case1. Histological appearances of the biopsied specimen demonstrated spindle or polygonal cells with atypical nuclei, eosinophilic amorphous osteoid and matured bone tissue.
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F3
Histological appearance of the biopsied specimen demonstrated spindle or polygonal cells with atypical nuclei, eosinophilic amorphous osteoid, and matured bone tissue (Figure 3).
PMC2852780_02
Case 2. Plain CT showed a lytic lesion in the posterior superior iliac spine (arrow).
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F4
On plain computed tomography (CT), a lytic lesion in the posterior superior iliac spine was apparent (Figure 4).
Case 2. (A) MRI showed a low-intense lesion around the left sacroiliac joint on T1-weighted images. (B) T2-weighed images confirmed a heterogenous hyperintense lesion. (C) The lesion was enhanced on fat-suppressed T1-weighed images.
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F5
The lesion was enhanced on fat-suppressed T1-weighted images. T2-weighted images confirmed a heterogeneous hyperintense lesion (Figure 5).
Case 2. Needle biopsy of the left iliac spine showed polygonal cells with hyperchromatic nuclei. The stroma consisted of chondroid and osteoid tissues.
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F6
Pathological diagnosis was chondroblastic osteosarcoma (Figure 6).