Figure 2.

Osteoblastoma. A: Coronal computed tomography shows a nonspecific expansile lesion (arrows) seen in the the right frontoethmoid air cells with extension into the right orbit. It shows ossific foci; B: Coronal T2-weighted image shows a well-defined mass (arrows) in the right ethmoid air cells with extension into the right orbit. It shows nonspecific intermediate to low signal intensity with signal void regions of calcifications and areas of high signal intensity; C: Axial contrast T1-weighted image shows inhomogeneous patterns of enhancement of the lesion (arrows).