case_images: PMC2852780_01
case_images: 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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case_images: PMC2852780_01_UPS-0300-9734-114-249-g001.jpg
case_images: F1
case_images: Plain radiograms of the proximal femur revealed a mixed sclerotic and lytic intramedullary lesion with extensive periosteal reaction (Figure 1).
case_images: 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.
case_images: UPS-0300-9734-114-249-g002.jpg
case_images: PMC2852780_01_UPS-0300-9734-114-249-g002.jpg
case_images: F2
case_images: 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).
case_images: Case1. Histological appearances of the biopsied specimen demonstrated spindle or polygonal cells with atypical nuclei, eosinophilic amorphous osteoid and matured bone tissue.
case_images: UPS-0300-9734-114-249-g003.jpg
case_images: PMC2852780_01_UPS-0300-9734-114-249-g003.jpg
case_images: F3
case_images: Histological appearance of the biopsied specimen demonstrated spindle or polygonal cells with atypical nuclei, eosinophilic amorphous osteoid, and matured bone tissue (Figure 3).
case_images: PMC2852780_02
case_images: Case 2. Plain CT showed a lytic lesion in the posterior superior iliac spine (arrow).
case_images: UPS-0300-9734-114-249-g004.jpg
case_images: PMC2852780_02_UPS-0300-9734-114-249-g004.jpg
case_images: F4
case_images: On plain computed tomography (CT), a lytic lesion in the posterior superior iliac spine was apparent (Figure 4).
case_images: 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.
case_images: UPS-0300-9734-114-249-g005.jpg
case_images: PMC2852780_02_UPS-0300-9734-114-249-g005.jpg
case_images: F5
case_images: The lesion was enhanced on fat-suppressed T1-weighted images. T2-weighted images confirmed a heterogeneous hyperintense lesion (Figure 5).
case_images: Case 2. Needle biopsy of the left iliac spine showed polygonal cells with hyperchromatic nuclei. The stroma consisted of chondroid and osteoid tissues.
case_images: UPS-0300-9734-114-249-g006.jpg
case_images: PMC2852780_02_UPS-0300-9734-114-249-g006.jpg
case_images: F6
case_images: Pathological diagnosis was chondroblastic osteosarcoma (Figure 6).