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Figure 1: Telangiectatic osteosarcoma in a 24-year-old woman. Anteroposterior X-ray of the pelvis shows a large aggressive tumour of the left hemipelvis (anterior a., lateral right b., and lateral left c.).
Figure 2: Magnetic resonance imaging shows an extensive bone forming. The tumour has multiple fluid-fluid levels and extended into the pelvis and eroded the hip.
Figure 3: Computed tomography shows the tumour involves entirety of the hemipelvis, the hip joint and crossing the sacroiliac joint. The image also shows a mass lesion contains multiple fluid-fluid levels.
Figure 4: The gross specimen of telangiectatic osteosarcoma, 20 cm x 25 cm x 16 cm, partly destroyed the ilium and widely invaded adjacent soft tissues. The expansile mass contain numerous blood-filled cystic spaces and spongy areas separated by delicate fibrous septa.
Figure 5: Histopathology of the telangiectatic osteosarcoma hematoxylin and eosin (H&E) staining showed numerous cyst-like spaces, some of them contains red blood cells and resemble vascular spaces (a .). The fibrous septa contain tumour cells and of atypical, bizarre, malignant appearing spindle cells and multi-nuclei osteoclast giant cells with multiple nuclei (b .), and bony osteoid production within the tumour (c .).