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Characteristic appearance of a constricted section of bowel resembling an apple core, typically associated with colorectal cancer.

Bilateral alveolar consolidation with central distribution, associated with pulmonary edema.

Tapering of the distal esophagus in achalasia, seen on a barium swallow study.

Multiple, well-rounded opacities on chest radiography, suggestive of hematogenous metastatic disease, often from renal cell carcinoma.

Periosteal reaction with elevation of the periosteum forming an angle, associated with osteosarcoma and other aggressive bone lesions.

Patchy, fluffy white lesions on the retina seen on fundoscopy, associated with hypertensive retinopathy.

Radiolucent crescent shape within a lesion in the bone, seen in avascular necrosis.

Two adjacent rounded radiolucencies in the upper abdomen on plain radiograph, indicative of duodenal atresia.

Thin, well-defined ring of calcification, often seen in silicosis or sarcoidosis.

Hazy areas of increased attenuation in the lung with preserved bronchial and vascular markings, associated with interstitial lung diseases and viral pneumonias.

Circumferential ring of ground-glass opacity surrounding a nodule or mass, often associated with invasive fungal infections.

Appearance of clustered cystic air spaces, typical of advanced interstitial lung disease.

Increased opacity of a vertebral body that looks whiter than adjacent structures, associated with Paget's disease or metastatic disease.

Loss of haustration in the colon resulting in a smooth colon, associated with chronic ulcerative colitis.

Scalloping of the frontal bones of the calvarium on prenatal ultrasonography, associated with spina bifida.

Constriction of a segment of colon with proximal dilatation, associated with colon cancer.

Gelatinous infiltration of the omentum, seen as a soft-tissue density mass on CT, typically associated with peritoneal carcinomatosis.

Phalangeal bone erosion with tapered proximal phalanx and relatively preserved distal joint, suggestive of psoriatic arthritis.

Presence of air in the pleural space, seen as a line of radiolucency separating the lung margin from the chest wall; commonly from trauma or spontaneous.

Laminated calcific density with a 'popcorn' shape, associated with benign lung hamartomas.

Lesion with a characteristic appearance of a ring of enhancement on CT or MRI, suggestive of brain abscess, metastatic cancer or demyelinating disease.

Elevation of the anterior fat pad seen on lateral elbow radiographs, suggestive of an elbow joint effusion.

The encasement of mesenteric vessels between enlarged mesenteric nodes, seen on CT, associated with lymphoma.

Appearance on an oblique lumbar spine radiograph suggesting a spinal pars interarticularis defect like spondylolysis.

Irregular borders of the cardiac silhouette on chest radiography, associated with pericarditis.

Radiolucent lesions with internal trabeculation, seen in giant cell tumor of the bone.

Subglottic tracheal narrowing creating a 'steeple' or 'pencil-point' appearance on anteroposterior neck radiograph, associated with croup.

Radiating spiculated periosteal reaction, suggestive of osteosarcoma.

Swelling of the epiglottis, seen as a thumb-like projection on lateral neck radiographs, associated with epiglottitis.