Radiology Notes

My notes during radiology residency, fellowship, and beyond…

Archive for January 23rd, 2010

Cystic Extraaxial Brain Lesions

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  • arachnoid cyst
    • CSF filled/signal
    • middle cranial fossa (MC) > cerebral convexities, basal cisterns, retrocerebellar region
    • hypogenesis of adjacent brain
    • no enhancement
    • low on DWI (like ventricle)
  • epidermoid cyst
    • has internal matrix, seen in T1
    • hyperintense to CSF on FLAIR
    • high on DWI (restricted diffusion)

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Written by lmwong

January 23, 2010 at 8:40 pm

Posted in cystic, differential, neuro

Germinal Matrix Hemorrhage

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  • low-birth-weight infants
  • most present in immediate postpartum period; can present up to 3-4 weeks post

Grading

  1. confined to germinal matrix
  2. …extends into ventricle (normal size)
  3. …with ventriculomegaly
  4. …extends into cerebrum

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Written by lmwong

January 23, 2010 at 8:30 pm

Globe Intraocular Calcification Differential

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  • neoplasms
    • retinoblastoma
    • astrocytic hamartomas
    • choroidal osteomas
  • metabolic
    • hyperparathyoidism (hypercalcemia)
  • degenerative
    • optic drusen
    • phthisis bulbi
    • prior retinal detachment
    • retinopathy of prematurity
  • congenital
    • Sturge-Weber syndrome
    • von Hippel-Lindau syndrome
  • Infection
    • toxocara
    • CMV

Written by lmwong

January 23, 2010 at 8:24 pm

Posted in differential, eye, neuro, orbit

Scalloped Posterior Vertebral Bodies

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  • Hydrocephalus
  • Hurlers
  • Ankylosing Spondylitis
  • Achondroplasia
  • Acromegaly
  • NF-1

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Written by lmwong

January 23, 2010 at 8:15 pm

Posted in differential, neuro, spine

Small Head Differential

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(2 SD below mean)

Primary microcephaly

  • familial and AD
  • trisomy 21, 13
  • Rubinstein-Taybi syndrome

Secondary Microcephaly

  • severe intrauterine hypoxic-ischemic injury
  • fetal ETOH syndrome
  • TORCH infections

Written by lmwong

January 23, 2010 at 7:59 pm

Large Head Differential

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(2 SD above mean)

  • hydrocephalus
  • chronic subdural fluid collections
  • benign macrocrania of infancy
  • neurocutaneous syndromes (NF1, TSC)
  • metabolic storage disease
  • demyelinating disorders (Alexander, Canavan)
  • achondroplasia
  • Megacephaly
  • Neoplasm

Written by lmwong

January 23, 2010 at 7:58 pm