Muskuloskeletal

Brodies abscess

This elderly man presented with left shoulder pain andfever. A frontal radiograph of the shoulder demonstrates advanced osteoarthritiswith glenohumeral joint space narrowing and osteophytosis

A lateral skull radiograph demonstrates innumerable variablysized lytic lesions throughout the skull. This appearance is typical foradvanced multiple myeloma, which was this patients diagnosis.

This 9-year-old girl presented with leg pain. A lateral radiographof the knee demonstrates a sclerotic lesion in the distal femur withpoorly defined borders that exhibits aggressive periosteal reaction, includinga Codmans triangle. This represented an osteogenic osteosarcoma.

(A) A noncontrast axial CT image demonstrates a large,hyperdense left extra-axial fluid collection, causing significant mass effect.Its biconvex shape indicates that it represents an epidural

Axial CT demonstrates an acute subdural haematomaalong the left hemisphere convexity with right shift of the midlinestructures and compression of the left lateral ventricle.

A 60-year-old woman with hemiparesis. Intracranialhemorrhage is illustrated (hyperdensity) onnoncontrast head CT following intra-arterial tissueplasminogen activator administered for left MCA territorialinfarct (arrows border infarct)

A 72-year-old woman with hemiparesis. (A) Late acute left MCA infarct is illustrated on noncontrast head CTwith brain windows (arrows border infarct)

This is the classic appearance of a giant cell tumor.