Osteitis

Lesions

involving the outer surface of the bone in children: a pictorial review. Septic cortical osteitis with subperiosteal abscess formation in a 7-year-old girl. Antero-posterior radiograph of the left tibia a shows an ill-defined lucency at the lateral aspect of the proximal tibial metaphysis (arrow). Axial  STIR image b reveals a crescentic, hyperintense fluid collection adjacent to the proximal tibia at this level. This collection is hypointense with peripheral enhancement as seen on the post-contrast axial c and sagittal d images. Enhancement can also be seen through surrounding soft tissues

Imaging of

skull vault tumors in adults. Miscellany. Paget disease (a, b) CT (a) and X-ray (b): Characteristic mixed bone lysis and sclerosis, cortical bone thickening, and expansion. Osteoporosis circumscripta cranii CT (c, d): large geographic radiolucent areas involving medullar and cortical bone in frontal and occipital regions (arrows). Amyloidoma (e, f) CT (e) and T2WI (f): Giant heterogeneous mass with marked T2 hypointensity and calcifications. Renal osteodystrophy CT (g): shows characteristic “salt-and-pepper pattern.” Brown tumor (h, i): unspecific well-defined, cystic appearance (arrows). Thalassemia CT (j): Diffuse diploic widening and “hair-on-end” appearance (arrow) with characteristic occipital bone preservation (arrowhead). Bone sarcoidosis (k, l) CT (k) and T2WI (l): Mixed predominantly lytic multiple lesions with lace-like internal pattern of calcification and T2 hypointensity (dashed arrows). Osteitis CT (m, n): Bone focal lysis and erosions of osteitis (arrows) contiguous to a frontal sinusitis complicated with intracranial laminar abscess (dashed arrow)