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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 .).