Presentation
Periodic moderate pain episodes on the right shoulder.
Patient Data
there is an epimetadiaphyseal lytic lesion with inhomogeneous T2 hyperintensity
maximal tumor size is over 5 cm
sclerotic irregular margins without bone marrow edema
there is a little linear calcified tumor matrix
no cortical destruction or periosteal reaction
no paraossal soft tissue edema
rotator cuff tendons, biceps tendons, labrum are unremarkable
no joint effusion
Case Discussion
There is a chondrogenic tumor located predominantly in epimetaphysis of the humerus.
Sometimes it's difficult to make an unambiguous conclusion about the type of chondrogenic tumor.
Calcification pattern in this case is not specific for enchondroma or atypical cartilaginous tumor.
Absent bone marrow edema and large tumor size are not characteristic signs of the chondroblastoma.
All signs and characteristics of this lesion together are consistent with a chondrosarcoma, probably a clear-cell type.
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