There is a large multilobulated expansile lucent bone lesion located at proximal tibial diaphysis and metaphysis measures around six by two and half by two centimeters in maximal craniocaudal, anteroposterior and transverse dimensions respectively.
The previously described lesion shows well defined sclerotic margins and a narrow zone of transition with its long axis parallel to the long axis of the long bone.
There is an ill-definition of the cortex in the medial aspect of the lesion, suspicious for a cortical breakthrough. No obvious soft tissue component.
No suspicious periosteal reaction or pathological fracture.
A biopsy is advised to rule out a bone tumor.