Presentation
Right knee pain.
Patient Data
There is a well-defined epiphyseal lytic lesion in the distal medial femur. It appears lobulated with a thin sclerotic margin and some internal curvilinear calcifications. It abuts the cortex without a definite cortical break or periosteal reaction.
There is a well-defined epiphyseal lesion located in posterior medial femoral condyle. This lesion show rounded lesion with intermediate to hypointense signal intensity on T1WI and T2WI, hyperintense signal on STIR and PD fat sat sequences. It is surrounded by hypointense T1/T2 rim. Additionally, there is adjacent bone marrow and soft tissue edema as well as a mild joint effusion.
Case Discussion
This case illustrates the typical appearance of chondroblastoma.
On CT, chondroblastomas usually appear as solitary lucent bone lesions. Features like internal calcifications, cortical involvement and cortical destruction can be seen.
On MRI, chondroblastomas usually appear as lobular lesions with thin hypointense sclerotic rim on T1 and T2 weighted images, surrounding bone marrow and soft tissue edema
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