Radiology Notes

My notes during radiology residency, fellowship, and beyond…

Archive for May 2008

Nonossifying Fibroma

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  • Very common
  • must be younger than 30 yo, painless
  • cortical defect
  • metaphysis of long bone
  • thin, sclerotic border
  • scalloped and slightly expansile
  • “don’t touch” lesion
  • CT will show interuption in cortex
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Written by lmwong

May 31, 2008 at 2:44 pm

Posted in bone, lytic, msk

Enchondromas

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  • most common lytic lesion of phalanges
  • calcified chondroid matrix, excpet in phalanges
  • Ollier disease = multiple
  • Maffucci syndrome = multiple enchondromas + soft tissue hemangiomas

Written by lmwong

May 31, 2008 at 2:37 pm

Posted in bone, lytic, msk

Fibrous Dysplasia

with 2 comments

  • no periosteal reaction
  • no malignant potential
  • pelvis, femur, ribs, skull
  • posterior ribs, expansile and lytic
  • ground glass or smoky matrix

Adamantinoma = FD in tibia
McCune-Albright Syndrome = Polyostostic FD, cafe-au lait spots, precocious puberty
Cherubism = FD in jaw

Written by lmwong

May 31, 2008 at 2:33 pm

Posted in bone, lytic, msk

Herpes Encephilits

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  • fever, headache, seizures, AMS
  • +PCR in CSF
  • MR most sensitive, positive 24-48h earlier than CT; early CT is normal
  • Medial temporal, inferior frontal cortex, contralateral cingulate gyrus
  • Cortical and subcortical T2 high, white matter spared
  • gyriform enhancement T1
  • restricted diffusion DWI; bilateral

Written by lmwong

May 28, 2008 at 10:52 pm

Posted in neuro

Grades of Ureteral Reflux

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Grade Findings
I Reflux confined to ureter only
II Reflux to the level of the intrarenal collecting system without dilatation
III Grade II + mild or moderate dilatation of the ureter or renal pelvis, but no or only slight forniceal blunting
IV Grade II + calyceal dilatation and obliteration of the sharp angle of the fornices, but maintainance of the papillary impressions
V Gross dilatation and tortuosity of the ureter; gross dilatation of the renal pelvis and calices; papillary impressions are no longer visible

Grades I-III: Typically resolve as the child grows

Grades IV-V: Typically require surgery to correct

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Written by lmwong

May 27, 2008 at 8:29 pm

Cervical Incompetence

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  • ultrasound diagnosis: funnelling of proximal cervix
  • reduced cervical length of less than 30 mm
  • increased risk of preterm delivery
  • place patient in Trendelenburg position and call OB STAT.

Written by lmwong

May 24, 2008 at 7:46 pm

Posted in OB, ultrasound

Adrenal Carcinoma

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  • large 4-20 cm
  • areas of central necrosis and hemorrhage
  • irregular enhancement
  • delay CECT shows poor washout
  • liver and lymph nodes metastasis
  • invasion in renal vein or IVC
  • MR: low T1, high T2

Written by lmwong

May 24, 2008 at 2:23 pm

Posted in abdomen, adrenal, gi, tumor