Radiology Notes

My notes during radiology residency, fellowship, and beyond…

Archive for September 2008

Infectious Esophagitis

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  • Candidiasis – plaquelike, shaggy
  • Herpes – multiple discrete ulcers
  • CMV – large, flat, solitary ulcer
  • HIV – indistinguishable from CMV

Written by lmwong

September 25, 2008 at 1:39 am

Peptic and Inflammatory Esophagitis

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  • mild reflux – thickened folds only
  • mod reflux – thickened folds and tiny ulcers
  • severe reflux – folds and moderate to large ulcers
  • chronic reflux – stricture above GEJ, scarring deformity, transverse folds
  • Barrett esophagus – stricture at high location, transition zone, reticulated mucosal pattern
  • Medication-induced – ulcer with edema, level or arch or distal
  • Crohn esophagitis – aphthous ulcers, confluent

Written by lmwong

September 25, 2008 at 1:34 am

Hemangioblastoma

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  • benign
  • most common primary cerebellar neoplasm in adults
  • multiple vs solitary
  • multiple, supratentorial ~ von Hippel-Lindau disease
  • spinal cord, medulla, cerebral hemispheres
  • always superficial location; pia matter blood supply
  • CT = well-defined cystic lesion, intensely enhances; 40% solid nonspecific findings; rarely calcify
  • MRI = low T1, high T2, enhances, flow voids
  • DDx: posterior fossa tumors
  • Link

Written by lmwong

September 24, 2008 at 4:18 am

Posted in cystic, neuro, tumor

Brain Stem Glioma

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  • majority are astrocytoma, mostly WHO Grade I and II
  • exophytic growth into adjacent cisternal spaces
  • enlarged pons, extending beyond anterior margin of basilar artery
  • abnormal fourth ventricle contour
  • bright on T2
  • enhancement is variable: avid to none
  • 80% occur in childhood
  • 15% of posterior fossa tumors in kids
  • DDx: posterior fossa tumors
  • link

Written by lmwong

September 24, 2008 at 3:54 am

Posted in neuro, pediatrics, tumor

Ependymoma

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  • posterior fossa tumor in children
  • from ependymal cell lining ventricular system
  • intraventricular or spinal cord mass
  • 70% in 4th ventricle
  • WHO grade II

CT

  • isodense
  • mixture of calcification, cystic changes, hemorrhage; heterogenous appearance

MRI

  • iso to gray matter on T1
  • hyper to gray matter on T2
  • heterogenous enhancement

DDX: posterior fossa tumors

link

Written by lmwong

September 24, 2008 at 3:42 am

Posted in neuro, pediatrics, tumor

Lines of the hip, pediatrics

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Congenital Hip Dysplasia
  • Yellow = Hilgenrenier’s line
  • Blue = Acetabular line
  • Red = Perkin’s line
  • Green = Shenton’s arc
  • Pink = proximal epiphysis lies outside of lower quadrant = CHD

Written by lmwong

September 23, 2008 at 2:41 pm

Posted in msk, pediatrics

Liver Infections

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Pyogenic Abscess

  • seeding from appendicitis, diverticulitis, cholecystitis, cholangitis, endocarditis
  • complex fluid collections
  • pic

Fungal Abscess

  • immunocompromised patients
  • Candida
  • “wheel within a wheel” appearance, target lesion
  • pic

Granulomatous Disease

  • Pneumocystits carinii in AIDS patients, MAI, CMV
  • multiple echogenic foci throughout the liver

Parasite

  • Echinococcal hydatid cyst
  • Amebic
  • Schistosomiasis
  • variable cystic appearances, daughter cysts, calcifications
  • pic

Written by lmwong

September 20, 2008 at 3:05 am

Posted in cystic, differential, gi, liver