Positive Rim Sign of Posterior Shoulder Dislocation

Positive rim sign : A important sign of posterior shoulder dislocation in routine AP view of the shoulder. It appears about 66% of all posterior shoulder dislocation patient.

Finding : distance between medial border of humeral head and anterior glenoid rim > 6 mm.

Cotton wool appearance

Cotton wool appearance : A plain radiograph sign of late stage Paget Disease. Its appearance is due to thickened, disorganized trabeculae which lead to areas of sclerosis in a previously lucent area of bone – typically the skull.

Finding: Mixed lytic + blastic pattern of thickened calvarium.

Draped aorta sign

Draped aorta sign : An important CT imaging feature that may be seen in a contained rupture of an abdominal aortic aneurysm.

Findings : The posterior wall of the aorta either is not identifiable as distinct from adjacent structures or when it closely follows the contour of adjacent vertebral bodies.

Pavus Tardus Effect

Parvus tardus waveform has been described, where the presence of a small amplitude waveform with a prolonged systolic rise (slow upstroke) is considered to be indicative of a proximal stenosis such as a renal artery stenosis