Pelvic pain and deformity.
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Large exophytic mass with soft tissue component and chondroid calcification is seen at left side of pelvis, arising from left ischiopubic and lower portion of iliac bones, measured about 142×128×115 mm in diameters.
Marked mass effect on pelvic structures is evident and rectum, urinary bladder, prostate gland and seminal vesicles are displaced to the rightward.
Fat plane between the mass and urinary bladder & rectum is intact, but there is no frank fat plane between the mass and lower aspect of prostate gland. Proximal part of left femur is intact.
Pathology proven case of chondrosarcoma in a 70 years old male. On imaging, these tumors have ring-and-arc chondroid matrix mineralization with aggressive features such as lytic pattern, deep endosteal scalloping and soft-tissue extension.