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Sandwich Sign-adenopathy most often from mesenteric lymphoma is the "bun" that encases the mesenteric vessels and fat (filling) |
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Scalloped Vertebra-anterior: pressure usually from aneurysm; posterior: from spinal tumors, neurofibromatosis or communicating hydrocephalus
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Sentinel Loop-one or two dilated loops of small bowel which may indicate the presence of an irritative process in the region, e.g., inflammation |
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Spine Sign-paradoxically increased density of lower spine seen on lateral chest x-ray indicative of a lower lobe process such as pneumonia |
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Snowman Sign-dilated vertical vein and SVC form head of snowman in Type 1 supracardiac Total Anomalous Pulmonary Venous Return; RA is "body" |
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Swan neck deformity-hyperextension of proximal interphalangeal joint and flexion of distal interphalangeal joint, e.g. in rheumatoid arthritis |
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String of Beads Sign-multiple, linearly-arranged small pockets of air in a fluid-dilated small bowel loop seen with mechanical SBO |
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Scimitar Sign-anomalous draining pulmonary vein along right heart border that usually empties into IVC; shaped like Turkish sword |
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Silver Fork Deformity-appearance of acutely dorsally angulated wrist from distal radius fracture seen in Colles fx |
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Snowstorm Appearance-innumerable small pulmonary nodules frequently associated with metastatic carcinoma from thyroid |
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Small Bowel Feces Sign-on abdominal CT, heterogeneous solid material containing air bubbles in dilated small bowel from SB obstruction |
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Silhouette Sign-the process whereby two substances of the same density which touch each other blur the edges between them |
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Scottie Dog-the appearance of the pedicle, transverse process and facets on an oblique lumbar spine x-ray |
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Shaggy Esophagus-irregularly ulcerated appearance of the lumen of the esophagus described with Candidiasis |
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Spinnaker Sail Sign-abnormal elevation of lobes of the thymus seen with pneumomediastinum; thymic sail sign is normal |
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Snowcapping-dense appearance of humeral head from avascular necrosis thought to resemble snow on mountain top |
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Snowstorm Pattern-breast-ultrasound sign of breast implant rupture; silicone granulomata produce multiple echoes in extracapsular breast silicone leaks |
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Shmoo Sign-appearance of prominent, rounded left ventricle and dilated aorta likened to the Shmoo in L'il Abner comic |
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Sister Mary Joseph Sign-nodule bulging at umbilicus as a result of metastatic disease in the abdomen, most often from GI tract and ovary |
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Shepherd's Crook Deformity-coxa vara with outward bowing of proximal femur in fibrous dysplasia or osteogenesis imperfecta |
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Soft Tissue Rim Sign-CT-edema of the ureteral wall surrounding an impacted ureteral stone; aids in DDX from phlebolith |
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Stack of Coins-dilated small bowel with little or no infiltration of the submucosa, as in scleroderma or sprue |
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String Sign-very thin luminal contrast usually in terminal ileum from spasm and eventually fibrosis, most often seen in Crohn disease |
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Sunburst Periosteal Reaction-highly aggressive spiculated reaction indicating a malignancy such as osteosarcoma |
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Steeple Sign-croup-smoothly tapered air shadow seen at level of larynx on AP chest or neck because of subglottic swelling |
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Salt and Pepper Skull-multiple, small areas of resorption of skull in hyperparathyroidism results in mottled appearance like salt and pepper |
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Signet Ring Sign-pulmonary-dilated bronchus is larger than accompanying pulmonary artery, seen on chest CT in bronchiectasis |
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Stepladder Appearance-multiple loops of small bowel in the left upper quadrant in a mechanical small bowel obstruction |
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Split Pleura Sign-on CT, contrast-enhanced visceral and parietal pleurae divide around a less-dense empyema |
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Stepladder Sign-breast-US sign of intracapsular breast implant rupture. Multiple parallel horizontal echogenic lines within collapsed implant shell |
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String of Beads (IR) Sign-corrugated or pleated appearance of artery affected by fibromuscular hyperplasia
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Spilled Teacup Sign-appearance of volar displaced concave surface of lunate in a lunate dislocation |
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Spoke Wheel Appearance-angiographic appearance of vessels
originally thought secondary to oncocytoma but also seen with renal cell carcinoma |
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Sausage Digit-fusiform swelling of a single digit resembling a cocktail sausage, classically seen in psoriasis |
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Soap Bubbly Appearance-expansile, septated appearance of solitary plasmacytoma or renal or thyroid cell carcinoma metastases |
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Sandwich Vertebra-appearance of vertebra in osteopetrosis due to increased density of endplates |
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Stipple Sign-contrast in the interstices of a papillary GU lesion suggestive of transitional cell tumors |
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Spotted Nephrogram-patchy enhancement of renal parenchyma seen on CT, MRI or angio as result of small vessel occlusion, e.g. vasculitis |
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Spaghetti Sign-linear filling defect representing blood clot in the bladder on CT or urogram |
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Stripe Sign-on perfusion lung scan, a perfusion defect with a stripe of normally perfused lung at pleural surface; mitigates against PE |
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Saber Shin Deformity-marked anterior bowing of tibia seen in congenital syphilis, Paget disease and rickets |
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Saber Sheath Trachea-marked coronal narrowing and sagittal widening of intrathoracic trachea, esp in COPD |
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Stocking Glove Sign-In this bone scan, there is a stocking glove sign on the right hand. This represents uptake in the bony structures of the hand as a result of arterial injection.
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String-of-pearls Sign-Nucs-Increased radiotracer activity on bone scan in linear pattern in several ribs representing traumatic injury versus metastatic disease which would have a scattered appearance.
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•Six-Point Star Sign-In this thyroid scan, the six point star sign represents an artifact seen as a result of septal penetration.
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Swiss Cheese Appearance-multiple fenestrations in ventricular septum usually seen in a muscular VSD |
