 CT best demonstrates a lucency involving the posterior arch of C1, rightward, just posterior to lateral masses, not involving adjacent transverse foramen. The edges are not rounded, however do demonstrate increased sclerosis. There is no evident bony bridging of trabeculation across the defect. There are no secondary C1 ring fractures. STIR MRI imaging demonstrates no adjacent muscle, subcutaneous, or ligamentous signal abnormalities to suggest the presence of injury or edema. Only a small focus of fluid is evident within the fracture cleft.Alignment is anatomic. There are no subluxations. The visualized intracranial and paraspinal contents are unremarkable.There is no significant disc pathology and there are no significant stenoses.
CT best demonstrates a lucency involving the posterior arch of C1, rightward, just posterior to lateral masses, not involving adjacent transverse foramen. The edges are not rounded, however do demonstrate increased sclerosis. There is no evident bony bridging of trabeculation across the defect. There are no secondary C1 ring fractures. STIR MRI imaging demonstrates no adjacent muscle, subcutaneous, or ligamentous signal abnormalities to suggest the presence of injury or edema. Only a small focus of fluid is evident within the fracture cleft. The constellation of the CT and MRI features provide evidence for a fracture, which is more likely subacute in age given these aforementioned imaging characteristics.