HEAD AND NECK IMAGING
EHAB ABOU ELFOTOUH. MD.
ORBITAL IMAGING IV
CHOROIDAL HEMANGIOMA:
 congenital vascular
hamartomas.
 Manifested in middle-
aged or elderly people.
 Equal distributi...
CHOROIDAL HEMANGIOMA:
 solitary choroidal
hemangioma as abenign
vascular neoplasm that
is confined to the
choroid.
 Has ...
CHOROIDAL HEMANGIOMA:
 CT imaging:
 Solitary ill-defined
mass.
 Posterior chamber of
the globe.
 High CT attenuation.
...
CHOROIDAL HEMANGIOMA:
 At MR imaging:
 A lenticular shape
mass.
 Ill defined margins.
 Posterior chamber.
 Hyperinten...
CHOROIDAL HEMANGIOMA:
 On T2WIs, signals
typically hyperintense.
 Usually isointense to
vitreous.
 enhanced intensely
a...
CHOROIDAL MELANOMA:
 most common primary
intraocular tumors in
adults.
 Melanomas occur in
any of three
subdivisions of ...
CHOROIDAL MELANOMA:
 Tumors initially have a
flat growth profile.
 later become elevated.
 Erupting through the
Bruch m...
CHOROIDAL MELANOMA:
 Primarily metastasize
to the liver.
 Some metastases
manifest before
primary tumor
detection.
 In ...
CHOROIDAL MELANOMA:
 Large melanomas (10
mm thick) managed with
enucleation.
 medium-
 sized lesions (3–10 mm
thick) ex...
CHOROIDAL MELANOMA:
 At unenhanced CT:
 Elevated posterior
chamber mass.
 Hyper-attenuating.
 Sharply marginated.
CHOROIDAL MELANOMA:
 At enhanced CT:
 Moderate intense
enhancement.
 With or without retinal
detachment.
 Orbital meta...
CHOROIDAL MELANOMA:
 At MR imaging:
 Posterior chamber
well-defined solid
mass.
 Melanotic melanomas
have shorter T1 an...
CHOROIDAL MELANOMA:
 Markedly
decreased signal
intensity on
T2WIs.
 Among ocular
tumors, only
melanomas manifest
these s...
CHOROIDAL MELANOMA:
 Choroidal melanomas
demonstrate moderate
to strong
enhancement.
 Contrast-enhanced fat-
suppressed ...
CHOROIDAL MELANOMA:
 Amelanotic
melanomas has:
 Isointense with
vitreous on T1WIs.
 slightly hypointense on
T2-weighted...
UVEAL METASTASES:
 Through posterior
ciliary arteries.
 Commonly involve the
posterior half of the
globe.
 primary lesi...
UVEAL METASTASES:
 Both eyes are affected
in about one-third of
cases.
 Also may involve
extraocular muscles.
 MR imagi...
UVEAL METASTASES:
 Homogenous
enhancing criteria.
THANKS.
Orbital imaging iv
Orbital imaging iv
Orbital imaging iv
Orbital imaging iv
Orbital imaging iv
Orbital imaging iv
Orbital imaging iv
Orbital imaging iv
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Orbital imaging iv

  1. 1. HEAD AND NECK IMAGING EHAB ABOU ELFOTOUH. MD. ORBITAL IMAGING IV
  2. 2. CHOROIDAL HEMANGIOMA:  congenital vascular hamartomas.  Manifested in middle- aged or elderly people.  Equal distribution in both sexes.
  3. 3. CHOROIDAL HEMANGIOMA:  solitary choroidal hemangioma as abenign vascular neoplasm that is confined to the choroid.  Has ill defined margins.  Posterior chamber of the globe.  Diffuse hemangiomas occur in Sturge-Weber syndrome.
  4. 4. CHOROIDAL HEMANGIOMA:  CT imaging:  Solitary ill-defined mass.  Posterior chamber of the globe.  High CT attenuation.  Intense enhancement.  With or without retinal detachement.
  5. 5. CHOROIDAL HEMANGIOMA:  At MR imaging:  A lenticular shape mass.  Ill defined margins.  Posterior chamber.  Hyperintense to vitreous on T1- weighted images.
  6. 6. CHOROIDAL HEMANGIOMA:  On T2WIs, signals typically hyperintense.  Usually isointense to vitreous.  enhanced intensely after the administration of contrast material.
  7. 7. CHOROIDAL MELANOMA:  most common primary intraocular tumors in adults.  Melanomas occur in any of three subdivisions of uveaL tract.  From preexisting melanocytic nevi.  56%of melanomas occur in those older than 50 years.
  8. 8. CHOROIDAL MELANOMA:  Tumors initially have a flat growth profile.  later become elevated.  Erupting through the Bruch membrane with characteristic mushroom shape.
  9. 9. CHOROIDAL MELANOMA:  Primarily metastasize to the liver.  Some metastases manifest before primary tumor detection.  In order of decreasing frequency of distal metastasis are lung, bone, kidney, and brain
  10. 10. CHOROIDAL MELANOMA:  Large melanomas (10 mm thick) managed with enucleation.  medium-  sized lesions (3–10 mm thick) external-beam radiationtherapy.  Small tumors (3 mm thick) follow up 3–6 months with US or transpupillary thermotherapy.
  11. 11. CHOROIDAL MELANOMA:  At unenhanced CT:  Elevated posterior chamber mass.  Hyper-attenuating.  Sharply marginated.
  12. 12. CHOROIDAL MELANOMA:  At enhanced CT:  Moderate intense enhancement.  With or without retinal detachment.  Orbital metastasis.
  13. 13. CHOROIDAL MELANOMA:  At MR imaging:  Posterior chamber well-defined solid mass.  Melanotic melanomas have shorter T1 and T2 relaxation times.  Increased signal intensity on T1WIs.
  14. 14. CHOROIDAL MELANOMA:  Markedly decreased signal intensity on T2WIs.  Among ocular tumors, only melanomas manifest these signal intensity character.
  15. 15. CHOROIDAL MELANOMA:  Choroidal melanomas demonstrate moderate to strong enhancement.  Contrast-enhanced fat- suppressed MR imaging demonstrate scleral invasion, extension to optic disc, and
  16. 16. CHOROIDAL MELANOMA:  Amelanotic melanomas has:  Isointense with vitreous on T1WIs.  slightly hypointense on T2-weighted images.
  17. 17. UVEAL METASTASES:  Through posterior ciliary arteries.  Commonly involve the posterior half of the globe.  primary lesions common sources of uveal metastases are breast and lung carcinoma.
  18. 18. UVEAL METASTASES:  Both eyes are affected in about one-third of cases.  Also may involve extraocular muscles.  MR imaging is superior to CT.  Signals similar to Amelanotic melanomas.
  19. 19. UVEAL METASTASES:  Homogenous enhancing criteria.
  20. 20. THANKS.

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