Aneurysmal Bone Cyst

                                                         AP and Lateral Radiographs

                                                             

STIR sagittal

                                        T1 Coronal                                         Axial T2








 10 year old girl who had a history of trauma  presented to the orthopaedic outpatient department with pain at the site of trauma. A plain radiograph was performed which show no fracture but demonstrated an eccentric expansile lucent lesion. Pt was sent for MRI for further characterization.


On the T2 and STIR sequences the eccentric expansile lesion shows hyperintense signal with multiple dependent fluid levels representing blood filled spaces. The lesion shows intermediate signal on T1


Fluid- fluid levels are characteristic of ABC but also seen in other conditions such as Giant cell tumor, telangiectatic osteosarcoma,  fibrous dysplasia.