Fig. 4
From: Spinal osteoblastoma: a retrospective study of 35 patients’ imaging findings with an emphasis on MRI
A 28-year-old man with aneurysmal bone cyst (ABC). A 28-year-old man with a lesion on the right accessory. The nidus can be visualized well on axial CT (a, b), especially in the bone window (b). The nidus exhibits isointense signal on T1WI (c) and hyperintense signal on FS T2WI (d). ABC appears conspicuous on MRI (e, f), with a typical finding of the fluid–fluid level (f)