abdominal aortic aneurysm abdominal aortic coarctation abetalipoproteinemia abnormal heart chamber dimensions abnormal placental size abscess absent distal clavicle absent nasal septum acalculous cholecystitis acanthosis nigricans accessory spleen achalasia achondroplasia acoustic neuroma acromegaly acro-osteolysis acute cholecystitis acute disseminated encephalomyelitis acute extrinsic allergic alveolitis acute kidney transplant rejection acute lower GI hemorrhage acute lymphocytic leukemia (ALL) acute pancreatitis acute spinal cord compression acute testicular pain acute upper GI hemorrhage adenoma sebaceum adenomatous colon polyps adenomyomatosis of gallbladder admixture lesion adrenal adenoma adrenal angiography adrenal calcification adrenal cyst adrenal hemorrhage adrenal imaging adrenal mass adrenal myelolipoma adrenoleukodystrophy adynamic ileus simulating bowel obstruction agenesis of corpus callosum airless lung Alexander disease allergic bronchopulmonary aspergillosis alpha fetoprotein (aFP) aluminum breakthrough amiodarone amyloidosis Andersson lesion anesthetic aneurysmal bone cyst angiodysplasia angiofibroma angiogram angiography angiomyolipoma aniridia ankle anatomy ankylosing spondylitis anosmia anterior vertebral scalloping aortic aneurysm aortic coarctation aortic laceration aortic pseudo-coarctation aortic regurgitation aortic stenosis Apert syndrome apical cap apical interstitial lung disease appendicitis aqueductal stenosis arachnodactyly arachnoiditis arc of Buehler arc of Riolan Arnold-Chiari malformation arteriogram artery of Adamkiewicz artery of Bernasconi and Cassinari arthrogram arthrography asbestos lung disease asbestosis ascariasis ascites in neonates Asherman disease Ask-Upmark kidney aspirate aspiration asplenia syndrome astrocytoma atelectasis atlantoaxial subluxation atlas fracture atrial septal defect (ASD) avascular necrosis (AVN) avascular necrosis (AVN) staging axis fracture azygos continuation of interrupted IVC azygos pseudo-lobe back-pressure renal atrophy bagassosis Baker cyst Bankhart deformity barium Barrett esophagus Barton fracture basal cell nevus syndrome basal ganglia calcification basilar interstitial lung disease basilar invagination Batson venous plexus battered child syndrome Beckwith-Wiedemann syndrome benign liver tumors Bennett fracture berry aneurysm beta hCG Biello-Siegel criteria bilateral adrenal mass bile duct pressure biliary atresia Binswanger disease biophysical profile biopsy bird-fancier's lung bird's nest IVC filter bladder calcification bladder rhabdomyosarcoma bleb vs. bulla block vertebra blue rubber bleb nevus syndrome blueberry muffin sign Boerhaave syndrome bone island bone metastases bone metastases in kids bone within a bone box-like heart brachydactyly brain abscess brain herniation brain iron brain metastases brain tumor calcifications breast dose in mammography breast imaging bright T1 lesion Brodie abscess bronchial adenoma bronchial anatomy bronchiectasis bronchogenic cyst broncho-pulmonary sequestration bubbly bone lesion Budd-Chiari syndrome bulging disc bullet-shaped vertebrae bullous diseases of esophagus byssinosis cafe-au-lait spots Caffey disease calcified liver metastases calcium hydroxy apatite calcium pyrophosphate deposition disease (CPPD) Camurati-Engelmann disease Candida micro-abscesses candidiasis of esophagus (moniliasis) Cantlie line Cantrell syndrome capitation Caplan syndrome captopril renal scan caput succedaneum carcinoid syndrome carcinoid tumor cardiac rhabdomyoma cardiomyopathy Carman meniscus sign Carney syndrome Caroli disease carotid artery bruit carotid-cavernous sinus fistula carotid-vertebral artery anastomoses Castleman disease catamenial pneumothorax cavernous hemangioma of liver cavernous sinus cavitary lung nodules cecal volvulus celery stalk metaphyses celiac disease (sprue) central pontine myelinolysis cephalohematoma cerebello-pontine angle (CPA) tumor cerebellum cerebrospinal fluid (CSF) ceroidosis cervical disc herniation cervical esophageal web cervical spine fractures cervical spine fusion (ankylosis) cesium 137 Chagas disease chalice (Bergman) sign Chamberlain's line Chance fracture chauffeur's fracture Chediak-Higashi syndrome cherubism chest metastases with pneumothorax Chilaiditi syndrome chisel fracture Chlamydia pneumonia cholangiocarcinoma choledochal cyst cholesterolosis chondroblastoma chondrocalcinosis chondromyxoid fibroma chondrosarcoma Chopart fracture-dislocation chordoma choriocarcinoma choristoma choroid plexus choroid plexus papilloma chronic cholecystitis chronic eosinophilic pneumonia chronic granulomatous disease of childhood chylothorax circumscribed breast lesions claw hand clay shoveler's fracture cleidocranial dysostosis Clonorchis sinensis clover-leaf skull (Kleeblatschaedel) CNS lipoma coal worker's pneumoconiosis coarse breast architecture cobalt 57 Coccidioides Cockayne syndrome cold bone lesions cold liver lesion cold spleen lesion cold thyroid nodule Colles fracture colon colon carcinoma colon obstruction colonic diverticular hemorrhage colonic diverticulitis colonic diverticulosis colonic narrowing column of Bertin common bile duct complete endocardial cushion defect complex liver mass in kids complications of ventriculo-peritoneal shunt computed tomography (CT) computerized tomography congenital absence of pulmonary valve congenital cardiomyopathy congenital heart disease congenital insensitivity to pain congenital lobar emphysema congenital renal cysts congenital renal osteodystrophy congenital sinus tumor congenital syphilis congenitally short esophagus conscious sedation contrast media contrast or contrast media corkscrew esophagus coronary angiography coronary artery anomalies coronary artery branches coronary artery calcification coronary artery dominance cortical nephrocalcinosis corticotrophic adenoma Courvoisier phenomenon Cowden syndrome Cowper's glands coxa plana craniopharyngioma craniosynostosis (premature sutural fusion) CREST syndrome Crohn disease Crohn disease vs ulcerative colitis Cronkhite-Canada syndrome crossed renal ectopia croup Crouzon syndrome cruciate ligaments of knee Cushing disease Cushing syndrome cyanosis cyst cystic adenomatoid malformation of lung cystic adnexal masses cystic fibrosis cystic liver metastases cystic lymphangioma cystic pelvic mass cystic sellar mass cystitis cystica cysts by ultrasound dactylitis Dandy-Walker syndrome dark T2 lesion degenerative disc disease delayed gastric emptying demyelinating disease dense liver on CT dense metaphyseal bands dense spleen deQuervain dislocation dermatomyositis dermoid tumor Desault dislocation desmoplastic (fibrotic) tumors developmental brain tumors developmental dysplasia of the hip diabetes insipidus diagnosis-related groups (DRG) diaphragmatic eventration diaphragmatic hernia diastematomyelia diastrophic dwarfism diffuse abdominal calcification diffuse esophageal spasm diffuse gallbladder wall thickening diffuse osteosclerosis (dense bone) diffuse pulmonary hemorrhage diffuse small bowel disease DiGeorge syndrome diplomyelia dipyridamole myocardial imaging disc sequestration discordant thyroid nodule disseminated necrotizing leukoencephalopathy diverticular disease of colon doppler double bubble sign double decidual sac Down syndrome Drash syndrome DRG (diagnosis related group) dromedary hump drooping lily sign drug-induced eosinophilic lung disease drugs toxic to lung duodenal atresia duodenal narrowing or obstruction duodenal tumors duodenal ulcer dye (contrast) Dyke-Davidoff-Masson syndrome dysmyelinating disease Eaton-Lambert syndrome Ebstein anomaly echocardiography echogenic pancreas ectopic pancreas ectopic pregnancy ectopic thyroid egg-on-its-side heart eggshell lymph node calcification Ehlers-Danlos syndrome Eisenmenger syndrome elbow fracture elbow ossification centers elevated hemidiaphragm Ellis-van Creveld syndrome emphysematous cholecystitis emphysematous gastritis empty sella syndrome encephalocele enchondroma endocardial cushion defect endocardial fibroelastosis enhancing brain nodules enlarged pituitary infundibulum eosinophilic gastroenteritis eosinophilic granuloma eosinophilic lung disease ependymoma epicardial fat sign epidermoid inclusion cyst epidermoid tumor epidural hematoma Erdheim-Chester disease Erlenmeyer flask deformity erlenmeyer flask mnemonic erosive gastritis erythroblastosis fetalis esophageal carcinoma esophageal diverticula esophageal diverticula esophageal dysmotility esophageal filling defect esophageal intramural pseudo-diverticulosis esophageal mucosal nodules esophageal narrowing esophageal perforation esophageal strictures esophageal trauma esophageal ulceration esophageal varices esophageal webs and rings esophagitis Essex-Lopresti fracture Ewing sarcoma extracolonic manifestations extradural mass extralobar sequestration extra-ocular muscle disease extrinsic allergic alveolitis faculty fallopian tube familial polyposis coli farmer's lung fatty liver featureless thecal sac fee-for-service (FFS) feline esophagus fellow female infertility fentanyl fetal death fetal doppler study fetal hydrops fibrodysplasia ossificans progressiva fibrolamellar hepatocarcinoma fibromuscular dysplasia (FMD) fibrous dysplasia filiform polyposis filling defect in renal collecting system Fleischner lines Fleischner sign fluorosis focal gallbladder wall thickening focal gigantism focal nodular hyperplasia (FNH) football sign foramen ovale foramen spinosum forearm fractures foregut cysts foreign body aspiration fourth ventricle mass fragile X syndrome Freiberg infraction Friedrich disease Frostberg inverted-three sign Galeazzi fracture gallbladder carcinoma gallbladder series gallium uptake gallium vs indium gallium-67 citrate gallstones gamekeeper's thumb gamma camera Gardner syndrome Gartner duct cyst gastric carcinoma gastric emptying gastric filling defects gastric narrowing gastric outlet obstruction gastric polyps gastric ulcers gastric varices gastric volvulus gastritis gatekeeper Gaucher disease generalized small bowel disease gestational sac gestational trophoblastic disease giant cell astrocytoma giant cell tumor GI-tract secretions GI-tract target lesion glioblastoma multiforme (GBM) glioma globoid cell (Krabbe) leukodystrophy globus pallidus necrosis glomus jugulare glomus tympanicum glycogenic acanthosis gooseneck deformity Gorham's vanishing bone disease gout graft-versus-host disease grapeskin cyst great vessels gyral brain calcification Hallervorden-Spatz disease halo sign halothane effect hamate fracture Hamman sign Hamman-Rich syndrome Hampton hump Hand-Schueller-Christian disease hangman's fracture harlequin eye health maintenance organization (HMO) heart failure in kids heel pad Heinz bodies hemangioblastoma hemangioma of bone hemangioma of vertebrae hemihypertrophy hemochromatosis hemophilia hemorrhagic brain metastases hemosiderosis Henoch-Schoenlein syndrome hepatic adenoma hepatobiliary imaging (Tc-HIDA) hepatoblastoma hepatocellular carcinoma (HCC) hepatoma hepatomegaly hereditary exostosis (osteochondromatosis) hereditary pancreatitis herniation of nucleus pulposus (HNP) heterotopic gray matter hiatal hernia Hill-Sachs deformity hip disease hip dislocation Hirschsprung disease histiocytosis X histologic histoplasmosis HLA B-27 antigen Hodgkin disease Holt-Oram syndrome homocystinuria honeycomb lung honeycombing horseshoe kidney hot bone lesions hot liver lesion hot spleen hot thyroid nodule Howell-Jolly bodies Huntington disease (chorea-athetosis) Hurler's syndrome Hutch bladder diverticulum Hutchinson syndrome hydatid cyst of Morgagni hydatiform mole hydranencephaly hydrocephalus hydrometrocolpos hydromyelia hyperostosis frontalis interna hyperparathyroidism hyperplastic cholecystosis hyperplastic gastric polyp hypersensitivity pneumonitis hypertrophic osteoarthropathy hypertrophic pyloric stenosis hypervascular liver metastases hypervitaminosis A hypoparathyroidism hypoplastic left heart syndrome hypothalamic histiocytoma hysterosalpingogram (HSG) icecream cone idiopathic hypoparathyroidism idiopathic pulmonary hemosiderosis IHSS immunodeficiency disorders inclusion body myositis incompetent cervix increased skull thickness infantile brain tumors infantile hydrocephalus inferior vena cava (IVC) filters infertility inflammatory gallbladder disease infuse intern internal auditory canal interstitial lung disease interstitial lung disease with increased volume interstitial pulmonary fibrosis intestinal lymphangiectasia intestinal pseudo-obstruction intra- vs. extra-axial brain mass intra-abdominal calcifications intracranial mycotic aneurysm intradural-extramedullary mass intralobar sequestration intramedullary mass intramural bowel gas intramural esophageal dissection intra-ocular calcification intraspinal drop metastases intrauterine growth retardation (IUGR) intra-ventricular hemorrhage intussusception involucrum iodine 123 iodine 131 irregular uterine lumen ischemic colitis IUGR (intrauterine growth retardation) IV cholangiography IV or I.V. IV urogram ivory vertebral body IVP (intravenous pyelogram) jackstone bladder calculus Jefferson fracture joint mice Jones fracture J-shaped sella juvenile polyposis coli juvenile rheumatoid arthritis (JRA) Kartagener syndrome Kasabach-Merritt syndrome Kidde technique (hysterosalpingogram) Kienbock disease Kirner Kirner deformity Klatskin tumor Klebsiella pneumonia Klippel-Feil syndrome knuckle sign Kocher fracture Kohler disease Krukenberg tumor Kveim test lacrimal gland enlargement lacunar skull (Luckenschaedel) lambda sign lambdoid suture defect large gallbladder large pleural effusion large uterus laryngeal papillomatosis LeFort fracture left atrial pressure left coronary artery branches left lung segments left ventricular hypertrophy left ventricular volume overload left-to-right shunts Legg-Calve-Perthes disease leiomyoma lemon sign leontiasis ossea leprosy (Hansen disease) leptomeningeal cyst Letterer-Siwe disease leukodystrophy leukoplakia LisFranc fracture-dislocation Little Leaguer's elbow liver anatomy liver calcifications liver cyst liver hemangioendothelioma liver metastases liver-spleen scan localized small bowel disease Loeffler pneumonia lower lobe predominance lunate dislocation lung abscess lung perfusion agents lung segmental anatomy lung ventilation agents Lutembacher syndrome Lyme arthritis lymphangioleiomyomatosis (LAM) lymphangitic lung metastases macrodystrophic lipomatosis Madelung deformity Mafucci syndrome magnetic resonance imaging (MRI) Maisonneuve fracture malakoplakia male infertility Malgaigne fracture malignancy and immunodeficiency malignant liver tumors malignant melanoma Mallory-Weiss syndrome malrotation midgut volvulus malt worker's lung mammogram mammography managed care organization maple bark disease march fracture Marchiafava-Bignami disease Marfan syndrome marginal artery of Drummond mass at base of tongue massive splenomegaly mastocytosis matrix calculi McCune-Albright syndrome McGregor's line Meckel diverticulum Meckel scan Meckel-Gruber syndrome meconium aspiration syndrome meconium ileus meconium plug medially deviated ureter mediastinal fibrosis Medicaid Medicare medullary cystic kidney disease medullary nephrocalcinosis medullary sponge kidney medulloblastoma megacolon mega-esophagus Meigs syndrome melorheostosis melting sign MEN-1 (Wermer) syndrome MEN-2 (Sipple) syndrome MEN-3 (Schimke, marfanoid) syndrome Menetrier disease Meniere's triad meningioma Menkes kinky-hair syndrome mesenteric adenopathy mesoblastic nephroma mesonephric structures metachromatic leukodystrophy metaphyseal dysplasia (Pyle disease) methysergide (Sansert) MIBG Michaelis-Guttman bodies microcystic adenoma of pancreas midazolam (Versed) middle ear mass middle mediastinal mass midline closure defects miliary lung infiltrate miliary TB millirad Milwaukee shoulder Mirizzi syndrome mitral valve prolapse (Barlow) syndrome molybdenum breakthrough monoarthritis Monteggia fracture Morquio's disease most common neoplasms in kids Mounier-Kuhn syndrome moyamoya disease mucinous cystic neoplasm of pancreas mucopolysaccharidoses Muir-Torre syndrome mullerian (para-mesonephric) duct multicentric reticulohistiocytosis multicystic dysplastic kidney disease multifocal kidney multilocular cystic nephroma multinodular goiter multiple endocrine neoplasia (MEN) multiple gestation multiple myeloma multiple renal cysts mushroom worker's lung myasthenia gravis & thymoma mycoplasma pneumonia mycotic aneurysm myelogram myelography myocardial infarct imaging myocardial perfusion imaging myotonic dystrophy Nabothian cyst nail-patella syndrome necrotizing enterocolitis neonatal heart failure neonatal pulmonary venous hypertension neoplasm nephroblastomatosis neuroblastoma neurofibromatosis neuropathic (Charcot) joint Niemann-Pick disease normal pressure hydrocephalus NSAID nuclear cardiology nuclear medicine ochronosis oligodendroglioma oligohydramnios oligomeganephronia Ollier disease omental cake optic nerve glioma optic nerve meningioma oral cholecystogram (OCG) orbital pseudotumor organ of Zuckerkandl Oriental cholangio-hepatitis Osgood-Schlatter disease osteitis fibrosa osteochondroma (exostosis) osteochondrosis osteochondrosis dissecans osteogenesis imperfecta osteoid osteoma osteoma osteomalacia osteomyelitis osteopetrosis (Albers-Schoenberg disease) osteopoikilosis out-of-network ovarian cyst ovarian fibroma ovarian granulosa-theca cell tumor ovarian stromal tumors ovarian tumors oxalosis pachydermoperiostosis Page kidney Paget disease Paget disease of breast Pancoast tumor pancreas divisum pancreatic adenocarcinoma pancreatic calcifications pancreatic cystic neoplasms pancreatic islet-cell tumors pancreatic neoplasms pancreatic pseudocysts pancreatitis Pandora's pneumonitis Panner disease papillary necrosis paraesophageal hiatal hernia paraganglioma (glomus tumor) para-sellar mass parasitic eosinophilic lung disease Parinaud syndrome parkinsonism parotid gland mass partial endocardial cushion defect participating provider patellar dislocation patent ductus arteriosus (PDA) pearl necklace gallbladder peliosis hepatis Pelizaeus-Merzbacher syndrome Pellegrini-Stieda disease pelvis Pepper syndrome pericardial cyst pericardial effusion perilunate dislocation periosteal reaction periosteal reaction patterns Peutz-Jeghers syndrome phakomatoses phentolamine (Regitine) pheochromocytoma phlegmonous gastritis physiological intracranial calcification Piedmont fracture pigmented villonodular synovitis (PVS) pineal gland calcification pineal tumors PIOPED study pituitary adenoma placental chorioangioma plain films (without contrast media) pleural effusion in newborn pleural fluid Plummer-Vinson syndrome pneumatosis cystoides pneumatosis intestinalis pneumomediastinum pneumonia with chest-wall involvement pneumoperitoneum pneumoperitoneum in kids pneumothorax polyarteritis nodosa polycystic kidney disease polydactyly polyhydramnios polypoid gallbladder lesions polyposis syndromes polysplenia syndrome popliteal artery porcelain gallbladder portal hypertension postbulbar duodenal ulcers postcapillary pulmonary hypertension posterior fossa tumors posterior mediastinal mass posterior vertebral scalloping Potter syndrome Pott's disease precapillary pulmonary hypertension prediverticular disease of colon preferred provider organization (PPO) primary (idiopathic) pulmonary hypertension primary biliary cirrhosis primary care provider (PCP) primary mega-ureter primary sclerosing cholangitis progeria (Hutchinson-Gilford) syndrome progressive massive fibrosis progressive multifocal leukoencephalopathy (PML) progressive supranuclear palsy (Steele-Richardson-Olszewski syndome) prolactinoma prominent portal vein radicles prostate anatomy prostate carcinoma provider proximal small bowel disease prune belly (Eagle-Barrett) syndrome pseudo-achalasia pseudo-fracture (Looser zone) pseudohypoparathyroidism pseudomyxoma peritonei pseudotumor cerebri psoriatic arthritis pulmonary alveolar proteinosis pulmonary artery sarcoma pulmonary edema pulmonary embolism pulmonary hypertension pulmonary sarcoidosis pulmonary sling pulmonary venolobar (scimitar) syndrome pyelogram pyknodysostosis RAD (radiation absorbed dose) radiation therapy radiologic technologist radiologist radiopaque Rancke complex rapid demineralization/osteopenia recurrent pneumonia in childhood reflex sympathetic dystrophy Reid's baseline Reiter syndrome REM (roentgen equivalent man) renal adenocarcinoma renal agenesis renal artery stenosis renal calcification renal calculi renal cancer renal masses in children renal osteodystrophy renal TB restrictive cardiomyopathy retinoblastoma retrocaval ureter retroperitoneal adenopathy retroperitoneal fibrosis retroperitoneal liposarcoma retro-pharyngeal (prevertebral) space reverse pulmonary edema pattern Reye syndrome rhabdomyosarcoma rheumatoid lung disease rickets right aortic arch right coronary artery branches right interlobar pulmonary artery right lung segments right middle lobe syndrome right ventricular hypertrophy right ventricular volume overload Rigler sign Riley-Day syndrome ring lesions in brain Rokitansky-Aschoff sinuses rotary subluxation of scaphoid round pneumonia rubella sabre-shin deformity sacral agenesis sacroiliitis Salter-Harris fractures Sandifer syndrome sandwich sign sarcoidosis sarcoma botryoides scabbard trachea scan scaphocephaly scaphoid (navicular) fracture Schatzki ring Scheuermann disease Schilder syndrome Schilling test schizencephaly Schmorl node scimitar syndrome scleroderma scleroderma sclerotic bone metastases scoliosis scotty dog scurvy Segond fracture septo-optic dysplasia sequestrum sequoiosis Sever disease Seymour fracture shaggy heart Shagreen patches Shepard fracture short limbs with osteopenia short metacarpals shoulder dislocation sickle cell anemia sideswipe elbow fracture silicosis Simon Nitinol IVC filter simple bone cyst Sinding-Larson-Johansson disease single lucent skull lesion situs inversus Sjogren syndrome skin lesions of tuberous sclerosis skin manifestations of GI disease sliding hiatal hernia slipped capital femoral epiphysis (SCFE) small bowel dilatation small bowel disease small bowel disease involving mesentery small bowel disease involving stomach small bowel disease involving terminal ileum small bowel infiltration small bowel lymphoma small bowel nodules small bowel obstruction small gallbladder small uterus snowman sign solid lesion of spleen solid renal mass solitary echogenic liver mass somatotrophic adenoma Spalding sign SPECT (single photon emission computed tomography) spermatocele spheroid calcification spinal muscular atrophy spleen cyst spleen metastases splenomegaly spondyloepiphyseal dysplasia spongy degeneration (Canavan disease) spontaneous osteolysis Sprengel deformity sprue (celiac disease) stellate breast lesions stereotactic Stierlin sign Still disease stomach cell types stroke Sturge-Weber-Dimitri syndrome subarachnoid hemorrhage subclavian steal syndrome subdural hematoma suberosis subgaleal hematoma subluxation without erosion subvalvular aortic stenosis superior mesenteric artery (SMA) syndrome superior vena cava syndrome superscan supratentorial gliomas supravalvular aortic stenosis Swyer-James syndrome syndromes of paranasal sinuses synovial osteochondromatosis synovial sarcoma syringomyelia systemic lupus erythematosus (SLE) Takayasu arteritis Tamm-Horsfall protein deposition target lesions of liver/spleen tarsal coalition tear drop fracture technetium 99m Terry Thomas sign tertiary esophageal contractions testicular cancer testicular microlithiasis testicular scan tetralogy of Fallot thalassemia thallium 201 thick small bowel folds thickened duodenal folds thickened gastric folds thoracic aortic aneurysm Thorotrast thromboangiitis obliterans (Buerger disease) thumb fractures thymoma thyroid acropachy thyroid calcifications thyroid carcinoma thyroid carcinoma risk factors thyroid imaging tibia vara (Blount disease) tibial bowing tibio-talar slant Tillaux fracture titanium Greenfield IVC filter titrate titration toddler's fracture tortuous aorta total anomalous pulmonary venous return (TAPVR) totally intrathoracic stomach tracheobronchopathia osteochondroplastica tracheo-esophageal fistula transducer transposition of the great vessels tricho-rhino-phalangeal syndrome tripod fracture Trummerfeld scurvy zone trumpet sign truncus arteriosus truncus vs transposition tuberculous peritonitis tuberous sclerosis (Bourneville disease) tubular (toothpaste) small bowel Turcot syndrome Turner syndrome tylosis typhlitis Uhl disease ulcerative colitis ulnar styloid erosions ulnar variance ultrasound undifferentiated abdominal malignancy undifferentiated sarcoma of liver unifocal kidney unilateral rib notching unstable cervical spine fractures upper GI series upper lobe predominance ureteral calcification ureteral pseudo-diverticulosis urethra urographic patterns usual interstitial pneumonia (UIP) uterine filling defect V sign of Naclerio V/Q mismatch vagotomy valvular aortic stenosis vas deferens calcifications vascular vasopressin (Pitressin) VATER syndrome vein of Galen aneurysm Vena-Tech IVC filter venous angioma ventilation/perfusion lung imaging Verner-Morrison (WDHA) syndrome vertebra plana vidian artery viral pneumonia vitamin D vitamin D-resistant rickets von Hippel-Lindau syndrome Waldenstrom macroglobulinemia water-hammer pulse Waterhouse-Friderichsen syndrome Wegener granulomatosis Weigert-Meyer rule Werner syndrome Westermark sign Whipple disease white line of Frankel white-matter disease Williams elfin-facies syndrome Wilms tumor Wilson disease Wimberger ring Wimberger sign wolffian (mesonephric) duct Wolman disease Wormian bones Wormian bones mnemonic wrist dislocation wrist fractures xanthogranulomatous pyelonephritis (XGP) xenon 133 Yersinia enterocolitica Zollinger-Ellison syndrome