Osteosarcoma can occur in any bone, with the distal femur and proximal tibia being the most common.
⒈ bone destruction
⒉tumor bone
⑶Tumor cartilage calcification Langfang People’s Hospital MRI CT Department Liu Lijian
Singing soft tissue masses
Be careful with periosteal reaction and Codman’s triangle
Three types
⒈ sclerotic type
Large amount of new tumor bone formation
(1) A large amount of cloudy, plaque-like tumor bone in the bone, with high density and, when apparent, large ivory changes.
(2) Soft tissue masses also have more tumor bone within them.
(3) Bone destruction is generally not significant.
(4) Periosteal hyperplasia is more obvious.
Osteolytic type
(1) Sieve-like, worm-like, large lamellar bone destruction
(2) Easily cause pathological fracture
(3) generally still see a small amount of osteoma and periosteal hyperplasia (such as osteoma is not obvious, X-ray to confirm the diagnosis is difficult)
Mixed type ⒈ ⒉ two coexist
The formation of tumor bone in osteosarcoma is the main basis of X-ray diagnosis
According to the analysis of tumor bone density and morphology
Three kinds of tumor bone: ivory-like (plaque-like), cotton wool-like (cloudy wool-like), needle-like
Comparison between X-ray and pathology
⒈ well-differentiated osteoblasts form ivory-like tumor bone
⒉Poorly differentiated osteoblasts form young bone and bone-like tissue in the shape of cotton wool
The needle-like bone is formed by the tumor breaking through the bone cortex, and then the tumor cells form a needle-like bone perpendicular to the bone cortex.
The less tumor bone component in osteosarcoma, the more malignant it is
Osteosarcoma can destroy the cartilage. In children, osteosarcoma occurring in the epiphysis can break through the cartilage of the epiphyseal plate and invade the epiphysis.