Radiology Notes

My notes during radiology residency, fellowship, and beyond…

Archive for the ‘cystic’ Category

Pediatric Cystic Renal Lesions

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Written by lmwong

March 19, 2010 at 2:26 pm

Cystic Intraaxial Supratentorial Brain Lesions

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  • astrocytoma
  • ganglioglioma and ganglioneuroma
  • pleomorphic xanthoastrocytoma
  • DNET
  • sinus mucocele that invaded through cranium
  • congenital

Written by lmwong

January 25, 2010 at 11:41 am

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

Congenital Cystic Adenomatoid Malformation

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  • Type 1
    • big cysts (2-10 cm)
  • Type 2
    • multiple small cysts
    • renal and cardiac anomalies
  • Type 3
    • solid
  • any lobe
  • alveoli replaced by adenomatoid
  • surgical resection
  • 70% present during 1st week of life
  • 10% diagnosed after 1st year
  • supplied by pulmonary artery; systemic supply rare
  • can involve entire lobe
  • prenatal diagnosis
    • polyhydramnios
    • fetal hydrops
    • solid or cystic mass in fetal thorax
  • excise affected lobe

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Written by lmwong

January 18, 2010 at 10:02 am

Cystic Pediatric Neck Masses

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Congenital:

  • Thyroglossal duct cyst – base of tongue, hyoid
  • 1st Brachial anomalies – between ear and mandible
  • 2nd brachial anomalies – mc, type 2 remnant of sinus of His, post to submandibular gland, anterior to scm, AL to vessels, brachiosaurus- otorenal syndrome
  • 3rd brachial anomalies – posterior or anterior triangle, cervical thymic cyst extend to mediastinum
  • 4th brachial anomalies – pyriform sinus fistula, inflammation next to thyroid
  • DermoId cysts – midline, paramidline, orbit, oral, nasal
  • Vascular – lymphatovenous malformations, locular, FFlevels

Acquired:

  • Suppuratibe adenopathy/abscess
  • Necrotic mets

Written by lmwong

January 16, 2010 at 11:08 am

Thin Walled Lung Cysts

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  • Eosinophilic granuloma
  • Lymphangioleiomyomatosis (LAM)
    • upper
    • uniform size
    • women in reproductive years
    • can rupture –> pneumothorax
  • Tuberous sclerosis
  • Neurofibromatosis
  • LIP

histiocytosis X

  • peribronchiolar distribution
  • nodules become cysts
  • ~ smoking
  • upper lobes
  • CPA spared
cystic lung disease

    Written by lmwong

    January 16, 2010 at 10:56 am

    Pericardial Cyst

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    • fluid filled cardiophrenic angle mass
    • R>L
    • attached to parietal pericardium; do not communicate with pericardial space

    Written by lmwong

    January 11, 2010 at 11:42 pm

    Posted in cardiac, chest, cystic