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Discontinuity in bony cortex, abnormal angulation, soft tissue swelling.

Focal dilation of the abdominal aorta, possible calcification of the aneurysm wall, retroperitoneal hematoma in rupture.

Hyperinflated lungs, flattened diaphragm, increased retrosternal airspace, bullae.

Extra-axial mass, dural tail sign, broad-based attachment to dura.

Hyperdense area on CT, surrounding edema, mass effect with possible midline shift.

Ventricular enlargement, transependymal flow of CSF, 'sunset eyes' sign.

Fracture or misalignment of cervical vertebrae, prevertebral soft tissue swelling, widening of interspinous space.

Anterior displacement of a vertebra, widening of the intervertebral disc space, possible neural foraminal narrowing.

Solitary pulmonary nodule or mass with or without spiculation, hilar enlargement, mediastinal lymphadenopathy.

Westermark sign, Hampton's hump, Fleischner sign, may be normal.

Pancreatic enlargement, peripancreatic stranding, pancreatic calcifications.

Widened mediastinum, abnormal aortic contour, possible calcifications.

Punched-out lytic lesions, diffuse osteopenia, pathological fractures.

Enlarged liver silhouette on abdominal radiographs, displacement of adjacent organs.

Appendix diameter > 6mm on ultrasound, periappendiceal fat stranding on CT, appendicolith.

Esophageal thickening on CT, stricture, hiatal hernia.

Presence of air in the pleural space; seen as a line of increased lucency; lung margin is visible distinct from the chest wall.

Cavitary lesions, Ghon complexes, miliary pattern on chest radiograph.

Radiopaque stones on X-ray or CT, hydronephrosis, ureteral dilation.

Opacification of affected sinus, mucosal thickening, air-fluid level.

Periosteal reaction, bone destruction, sequestrum and involucrum formation.

Reticular or nodular pattern, honeycombing, ground-glass opacities.

Bowel wall thickening, 'string sign' in Crohn's, 'lead pipe' appearance in ulcerative colitis.

Reduced bone density, vertebral compression fractures, cortical thinning.

Dilated loops of small bowel, air-fluid levels, stack of coins or string of pearls sign on X-ray.

Consolidation, air bronchograms, increased opacity.

Blunting of costophrenic angle, meniscus sign, homogeneous opacity.

Interstitial and alveolar infiltrates, Kerley B lines, Bat wing or butterfly pattern of opacities.

Well-defined, round or oval breast mass, may be multiple, homogeneous density.

Echogenic foci with posterior acoustic shadowing on ultrasound, may have calcified gallstones on X-ray.

Rounded opacities, can be solitary or multiple, size varies, may have calcifications.

Cardiomegaly, interstitial edema, pleural effusion, Kerley B lines.

Joint space narrowing, osteophytes, subchondral sclerosis, subchondral cysts.

Mass with spiculated margins, microcalcifications, architectural distortion.