SlideShare una empresa de Scribd logo
1 de 28
HEAD AND NECK IMAGING
EHAB ABOU ELFOTOUH. MD.
ORBITAL IMAGING IV
CHOROIDAL HEMANGIOMA:
 congenital vascular
hamartomas.
 Manifested in middle-
aged or elderly people.
 Equal distribution in
both sexes.
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.
CHOROIDAL HEMANGIOMA:
 CT imaging:
 Solitary ill-defined
mass.
 Posterior chamber of
the globe.
 High CT attenuation.
 Intense enhancement.
 With or without retinal
detachement.
CHOROIDAL HEMANGIOMA:
 At MR imaging:
 A lenticular shape
mass.
 Ill defined margins.
 Posterior chamber.
 Hyperintense to
vitreous on T1-
weighted images.
CHOROIDAL HEMANGIOMA:
 On T2WIs, signals
typically hyperintense.
 Usually isointense to
vitreous.
 enhanced intensely
after the administration
of contrast material.
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.
CHOROIDAL MELANOMA:
 Tumors initially have a
flat growth profile.
 later become elevated.
 Erupting through the
Bruch membrane with
characteristic
mushroom shape.
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
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.
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 metastasis.
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.
CHOROIDAL MELANOMA:
 Markedly
decreased signal
intensity on
T2WIs.
 Among ocular
tumors, only
melanomas manifest
these signal intensity
character.
CHOROIDAL MELANOMA:
 Choroidal melanomas
demonstrate moderate
to strong
enhancement.
 Contrast-enhanced fat-
suppressed MR
imaging demonstrate
scleral
invasion, extension to
optic disc, and
CHOROIDAL MELANOMA:
 Amelanotic
melanomas has:
 Isointense with
vitreous on T1WIs.
 slightly hypointense on
T2-weighted images.
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.
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.
UVEAL METASTASES:
 Homogenous
enhancing criteria.
THANKS.

Más contenido relacionado

La actualidad más candente

Presentation1.pptx orbit.
Presentation1.pptx orbit.Presentation1.pptx orbit.
Presentation1.pptx orbit.
Abdellah Nazeer
 
Presentation1.pptx, supratentorial brain tumour
Presentation1.pptx, supratentorial brain tumourPresentation1.pptx, supratentorial brain tumour
Presentation1.pptx, supratentorial brain tumour
Abdellah Nazeer
 
Pediatric orbit tumors and tumorlike
Pediatric orbit tumors and tumorlikePediatric orbit tumors and tumorlike
Pediatric orbit tumors and tumorlike
Sidra Afzal
 
Presentation1.pptx, ultrasound examination of the orbit.
Presentation1.pptx, ultrasound examination of the orbit.Presentation1.pptx, ultrasound examination of the orbit.
Presentation1.pptx, ultrasound examination of the orbit.
Abdellah Nazeer
 
Presentation1.pptx, radiological imaging of intra cranial calcification.
Presentation1.pptx, radiological imaging of intra cranial calcification.Presentation1.pptx, radiological imaging of intra cranial calcification.
Presentation1.pptx, radiological imaging of intra cranial calcification.
Abdellah Nazeer
 
Intraocular tumor ro
Intraocular tumor roIntraocular tumor ro
Intraocular tumor ro
farranajwa
 
Presentation1.pptx, brain film reading, lecture 11.
Presentation1.pptx, brain film reading, lecture 11.Presentation1.pptx, brain film reading, lecture 11.
Presentation1.pptx, brain film reading, lecture 11.
Abdellah Nazeer
 

La actualidad más candente (20)

intraocular tumours
intraocular tumoursintraocular tumours
intraocular tumours
 
Vascular tumours of the orbit
Vascular tumours of the orbitVascular tumours of the orbit
Vascular tumours of the orbit
 
Presentation1.pptx orbit.
Presentation1.pptx orbit.Presentation1.pptx orbit.
Presentation1.pptx orbit.
 
Presentation1.pptx, supratentorial brain tumour
Presentation1.pptx, supratentorial brain tumourPresentation1.pptx, supratentorial brain tumour
Presentation1.pptx, supratentorial brain tumour
 
Orbital tumours
Orbital tumoursOrbital tumours
Orbital tumours
 
intracerebral calcification
intracerebral calcificationintracerebral calcification
intracerebral calcification
 
Pediatric orbit tumors and tumorlike
Pediatric orbit tumors and tumorlikePediatric orbit tumors and tumorlike
Pediatric orbit tumors and tumorlike
 
Eye & orbit tumors anatomy, epidemiology, pathology by himani
Eye & orbit tumors anatomy, epidemiology, pathology by himaniEye & orbit tumors anatomy, epidemiology, pathology by himani
Eye & orbit tumors anatomy, epidemiology, pathology by himani
 
Presentation1.pptx, ultrasound examination of the orbit.
Presentation1.pptx, ultrasound examination of the orbit.Presentation1.pptx, ultrasound examination of the orbit.
Presentation1.pptx, ultrasound examination of the orbit.
 
Presentation1.pptx, radiological imaging of intra cranial calcification.
Presentation1.pptx, radiological imaging of intra cranial calcification.Presentation1.pptx, radiological imaging of intra cranial calcification.
Presentation1.pptx, radiological imaging of intra cranial calcification.
 
Intraocular tumors 18
Intraocular tumors 18Intraocular tumors 18
Intraocular tumors 18
 
PHYSIOLOGICAL AND PATHOLOGICAL CALCIFICATION OF BRAIN
PHYSIOLOGICAL AND PATHOLOGICAL  CALCIFICATION OF BRAINPHYSIOLOGICAL AND PATHOLOGICAL  CALCIFICATION OF BRAIN
PHYSIOLOGICAL AND PATHOLOGICAL CALCIFICATION OF BRAIN
 
Proptosis in ophthalmology
Proptosis  in ophthalmologyProptosis  in ophthalmology
Proptosis in ophthalmology
 
Intraocular tumor ro
Intraocular tumor roIntraocular tumor ro
Intraocular tumor ro
 
Neuro imaging and electro diagnostics
Neuro imaging and electro diagnosticsNeuro imaging and electro diagnostics
Neuro imaging and electro diagnostics
 
A Rare Case Of Capillary Haemangioma Of Eyelid In A Child.
A Rare Case Of Capillary Haemangioma Of Eyelid In A Child. A Rare Case Of Capillary Haemangioma Of Eyelid In A Child.
A Rare Case Of Capillary Haemangioma Of Eyelid In A Child.
 
Intracranial Calcification in Cone Beam CT & Medical CT
Intracranial Calcification in Cone Beam CT & Medical CTIntracranial Calcification in Cone Beam CT & Medical CT
Intracranial Calcification in Cone Beam CT & Medical CT
 
Extraconal orbital tumors
Extraconal orbital tumorsExtraconal orbital tumors
Extraconal orbital tumors
 
Presentation1.pptx, brain film reading, lecture 11.
Presentation1.pptx, brain film reading, lecture 11.Presentation1.pptx, brain film reading, lecture 11.
Presentation1.pptx, brain film reading, lecture 11.
 
Orbit pathology
Orbit pathologyOrbit pathology
Orbit pathology
 

Similar a Orbital imaging iv

Haemangiomas And Vascular Malformations
Haemangiomas And Vascular MalformationsHaemangiomas And Vascular Malformations
Haemangiomas And Vascular Malformations
plasticclinic
 

Similar a Orbital imaging iv (20)

Glomus Tumours
Glomus TumoursGlomus Tumours
Glomus Tumours
 
imaging of itraconal mass EOS 2015.pptx
imaging of itraconal mass EOS 2015.pptximaging of itraconal mass EOS 2015.pptx
imaging of itraconal mass EOS 2015.pptx
 
IMAGING OF SPINAL TUMORS
IMAGING OF SPINAL TUMORS IMAGING OF SPINAL TUMORS
IMAGING OF SPINAL TUMORS
 
Amol cardiac tumours
Amol cardiac tumoursAmol cardiac tumours
Amol cardiac tumours
 
Orbital neoplasms & malformations
Orbital neoplasms & malformationsOrbital neoplasms & malformations
Orbital neoplasms & malformations
 
Radiological features of intracranial tumors 1
Radiological features of intracranial tumors 1Radiological features of intracranial tumors 1
Radiological features of intracranial tumors 1
 
Pediatric abdominal tumors
Pediatric abdominal tumorsPediatric abdominal tumors
Pediatric abdominal tumors
 
Haemangiomas And Vascular Malformations
Haemangiomas And Vascular MalformationsHaemangiomas And Vascular Malformations
Haemangiomas And Vascular Malformations
 
CNS TUMOR (Radiology) By Oconer
CNS TUMOR (Radiology) By OconerCNS TUMOR (Radiology) By Oconer
CNS TUMOR (Radiology) By Oconer
 
Head and neck
Head and neckHead and neck
Head and neck
 
Imaging in multiple ring enhancing brain lesions
Imaging in multiple ring enhancing brain lesionsImaging in multiple ring enhancing brain lesions
Imaging in multiple ring enhancing brain lesions
 
ORBITAL TUMOR
ORBITAL TUMORORBITAL TUMOR
ORBITAL TUMOR
 
Vertebral hemangiomas.pptx
Vertebral hemangiomas.pptxVertebral hemangiomas.pptx
Vertebral hemangiomas.pptx
 
Brain Tumors
Brain TumorsBrain Tumors
Brain Tumors
 
0928 Bt
0928 Bt0928 Bt
0928 Bt
 
1. pediatric tumors dr. sinhasan, mdzah
1. pediatric tumors  dr. sinhasan, mdzah1. pediatric tumors  dr. sinhasan, mdzah
1. pediatric tumors dr. sinhasan, mdzah
 
Cp angle tumours
Cp angle tumoursCp angle tumours
Cp angle tumours
 
Third ventricular-masses
Third ventricular-massesThird ventricular-masses
Third ventricular-masses
 
Third ventricular-masses
Third ventricular-massesThird ventricular-masses
Third ventricular-masses
 
SPINAL TUMOR.pptx
SPINAL TUMOR.pptxSPINAL TUMOR.pptx
SPINAL TUMOR.pptx
 

Más de Ehab Elftouh

Más de Ehab Elftouh (6)

Ms 1
Ms 1Ms 1
Ms 1
 
Multi detector ct cerebral angiography
Multi detector ct cerebral angiographyMulti detector ct cerebral angiography
Multi detector ct cerebral angiography
 
Mra
MraMra
Mra
 
Neuro imaging in epilepsy
Neuro imaging in                                               epilepsyNeuro imaging in                                               epilepsy
Neuro imaging in epilepsy
 
Imaging of enlarged lymph node
Imaging of enlarged lymph nodeImaging of enlarged lymph node
Imaging of enlarged lymph node
 
Quiz
QuizQuiz
Quiz
 

Último

Ahmedabad Call Girls Book Now 8980367676 Top Class Ahmedabad Escort Service A...
Ahmedabad Call Girls Book Now 8980367676 Top Class Ahmedabad Escort Service A...Ahmedabad Call Girls Book Now 8980367676 Top Class Ahmedabad Escort Service A...
Ahmedabad Call Girls Book Now 8980367676 Top Class Ahmedabad Escort Service A...
Genuine Call Girls
 
Cara Menggugurkan Kandungan Dengan Cepat Selesai Dalam 24 Jam Secara Alami Bu...
Cara Menggugurkan Kandungan Dengan Cepat Selesai Dalam 24 Jam Secara Alami Bu...Cara Menggugurkan Kandungan Dengan Cepat Selesai Dalam 24 Jam Secara Alami Bu...
Cara Menggugurkan Kandungan Dengan Cepat Selesai Dalam 24 Jam Secara Alami Bu...
Cara Menggugurkan Kandungan 087776558899
 
Dehradun Call Girls Service {8854095900} ❤️VVIP ROCKY Call Girl in Dehradun U...
Dehradun Call Girls Service {8854095900} ❤️VVIP ROCKY Call Girl in Dehradun U...Dehradun Call Girls Service {8854095900} ❤️VVIP ROCKY Call Girl in Dehradun U...
Dehradun Call Girls Service {8854095900} ❤️VVIP ROCKY Call Girl in Dehradun U...
Sheetaleventcompany
 
Premium Call Girls Dehradun {8854095900} ❤️VVIP ANJU Call Girls in Dehradun U...
Premium Call Girls Dehradun {8854095900} ❤️VVIP ANJU Call Girls in Dehradun U...Premium Call Girls Dehradun {8854095900} ❤️VVIP ANJU Call Girls in Dehradun U...
Premium Call Girls Dehradun {8854095900} ❤️VVIP ANJU Call Girls in Dehradun U...
Sheetaleventcompany
 

Último (20)

Kolkata Call Girls Shobhabazar 💯Call Us 🔝 8005736733 🔝 💃 Top Class Call Gir...
Kolkata Call Girls Shobhabazar  💯Call Us 🔝 8005736733 🔝 💃  Top Class Call Gir...Kolkata Call Girls Shobhabazar  💯Call Us 🔝 8005736733 🔝 💃  Top Class Call Gir...
Kolkata Call Girls Shobhabazar 💯Call Us 🔝 8005736733 🔝 💃 Top Class Call Gir...
 
Ahmedabad Call Girls Book Now 8980367676 Top Class Ahmedabad Escort Service A...
Ahmedabad Call Girls Book Now 8980367676 Top Class Ahmedabad Escort Service A...Ahmedabad Call Girls Book Now 8980367676 Top Class Ahmedabad Escort Service A...
Ahmedabad Call Girls Book Now 8980367676 Top Class Ahmedabad Escort Service A...
 
Cara Menggugurkan Kandungan Dengan Cepat Selesai Dalam 24 Jam Secara Alami Bu...
Cara Menggugurkan Kandungan Dengan Cepat Selesai Dalam 24 Jam Secara Alami Bu...Cara Menggugurkan Kandungan Dengan Cepat Selesai Dalam 24 Jam Secara Alami Bu...
Cara Menggugurkan Kandungan Dengan Cepat Selesai Dalam 24 Jam Secara Alami Bu...
 
Call Girls Bangalore - 450+ Call Girl Cash Payment 💯Call Us 🔝 6378878445 🔝 💃 ...
Call Girls Bangalore - 450+ Call Girl Cash Payment 💯Call Us 🔝 6378878445 🔝 💃 ...Call Girls Bangalore - 450+ Call Girl Cash Payment 💯Call Us 🔝 6378878445 🔝 💃 ...
Call Girls Bangalore - 450+ Call Girl Cash Payment 💯Call Us 🔝 6378878445 🔝 💃 ...
 
(RIYA)🎄Airhostess Call Girl Jaipur Call Now 8445551418 Premium Collection Of ...
(RIYA)🎄Airhostess Call Girl Jaipur Call Now 8445551418 Premium Collection Of ...(RIYA)🎄Airhostess Call Girl Jaipur Call Now 8445551418 Premium Collection Of ...
(RIYA)🎄Airhostess Call Girl Jaipur Call Now 8445551418 Premium Collection Of ...
 
Chandigarh Call Girls Service ❤️🍑 9809698092 👄🫦Independent Escort Service Cha...
Chandigarh Call Girls Service ❤️🍑 9809698092 👄🫦Independent Escort Service Cha...Chandigarh Call Girls Service ❤️🍑 9809698092 👄🫦Independent Escort Service Cha...
Chandigarh Call Girls Service ❤️🍑 9809698092 👄🫦Independent Escort Service Cha...
 
❤️Call Girl Service In Chandigarh☎️9814379184☎️ Call Girl in Chandigarh☎️ Cha...
❤️Call Girl Service In Chandigarh☎️9814379184☎️ Call Girl in Chandigarh☎️ Cha...❤️Call Girl Service In Chandigarh☎️9814379184☎️ Call Girl in Chandigarh☎️ Cha...
❤️Call Girl Service In Chandigarh☎️9814379184☎️ Call Girl in Chandigarh☎️ Cha...
 
Call Girl In Chandigarh 📞9809698092📞 Just📲 Call Inaaya Chandigarh Call Girls ...
Call Girl In Chandigarh 📞9809698092📞 Just📲 Call Inaaya Chandigarh Call Girls ...Call Girl In Chandigarh 📞9809698092📞 Just📲 Call Inaaya Chandigarh Call Girls ...
Call Girl In Chandigarh 📞9809698092📞 Just📲 Call Inaaya Chandigarh Call Girls ...
 
Chennai ❣️ Call Girl 6378878445 Call Girls in Chennai Escort service book now
Chennai ❣️ Call Girl 6378878445 Call Girls in Chennai Escort service book nowChennai ❣️ Call Girl 6378878445 Call Girls in Chennai Escort service book now
Chennai ❣️ Call Girl 6378878445 Call Girls in Chennai Escort service book now
 
Gastric Cancer: Сlinical Implementation of Artificial Intelligence, Synergeti...
Gastric Cancer: Сlinical Implementation of Artificial Intelligence, Synergeti...Gastric Cancer: Сlinical Implementation of Artificial Intelligence, Synergeti...
Gastric Cancer: Сlinical Implementation of Artificial Intelligence, Synergeti...
 
💰Call Girl In Bangalore☎️7304373326💰 Call Girl service in Bangalore☎️Bangalor...
💰Call Girl In Bangalore☎️7304373326💰 Call Girl service in Bangalore☎️Bangalor...💰Call Girl In Bangalore☎️7304373326💰 Call Girl service in Bangalore☎️Bangalor...
💰Call Girl In Bangalore☎️7304373326💰 Call Girl service in Bangalore☎️Bangalor...
 
💰Call Girl In Bangalore☎️63788-78445💰 Call Girl service in Bangalore☎️Bangalo...
💰Call Girl In Bangalore☎️63788-78445💰 Call Girl service in Bangalore☎️Bangalo...💰Call Girl In Bangalore☎️63788-78445💰 Call Girl service in Bangalore☎️Bangalo...
💰Call Girl In Bangalore☎️63788-78445💰 Call Girl service in Bangalore☎️Bangalo...
 
7 steps How to prevent Thalassemia : Dr Sharda Jain & Vandana Gupta
7 steps How to prevent Thalassemia : Dr Sharda Jain & Vandana Gupta7 steps How to prevent Thalassemia : Dr Sharda Jain & Vandana Gupta
7 steps How to prevent Thalassemia : Dr Sharda Jain & Vandana Gupta
 
Call Girls Mussoorie Just Call 8854095900 Top Class Call Girl Service Available
Call Girls Mussoorie Just Call 8854095900 Top Class Call Girl Service AvailableCall Girls Mussoorie Just Call 8854095900 Top Class Call Girl Service Available
Call Girls Mussoorie Just Call 8854095900 Top Class Call Girl Service Available
 
Dehradun Call Girls Service {8854095900} ❤️VVIP ROCKY Call Girl in Dehradun U...
Dehradun Call Girls Service {8854095900} ❤️VVIP ROCKY Call Girl in Dehradun U...Dehradun Call Girls Service {8854095900} ❤️VVIP ROCKY Call Girl in Dehradun U...
Dehradun Call Girls Service {8854095900} ❤️VVIP ROCKY Call Girl in Dehradun U...
 
Premium Call Girls Dehradun {8854095900} ❤️VVIP ANJU Call Girls in Dehradun U...
Premium Call Girls Dehradun {8854095900} ❤️VVIP ANJU Call Girls in Dehradun U...Premium Call Girls Dehradun {8854095900} ❤️VVIP ANJU Call Girls in Dehradun U...
Premium Call Girls Dehradun {8854095900} ❤️VVIP ANJU Call Girls in Dehradun U...
 
Exclusive Call Girls Bangalore {7304373326} ❤️VVIP POOJA Call Girls in Bangal...
Exclusive Call Girls Bangalore {7304373326} ❤️VVIP POOJA Call Girls in Bangal...Exclusive Call Girls Bangalore {7304373326} ❤️VVIP POOJA Call Girls in Bangal...
Exclusive Call Girls Bangalore {7304373326} ❤️VVIP POOJA Call Girls in Bangal...
 
Cardiac Output, Venous Return, and Their Regulation
Cardiac Output, Venous Return, and Their RegulationCardiac Output, Venous Return, and Their Regulation
Cardiac Output, Venous Return, and Their Regulation
 
Chandigarh Call Girls Service ❤️🍑 9809698092 👄🫦Independent Escort Service Cha...
Chandigarh Call Girls Service ❤️🍑 9809698092 👄🫦Independent Escort Service Cha...Chandigarh Call Girls Service ❤️🍑 9809698092 👄🫦Independent Escort Service Cha...
Chandigarh Call Girls Service ❤️🍑 9809698092 👄🫦Independent Escort Service Cha...
 
Circulatory Shock, types and stages, compensatory mechanisms
Circulatory Shock, types and stages, compensatory mechanismsCirculatory Shock, types and stages, compensatory mechanisms
Circulatory Shock, types and stages, compensatory mechanisms
 

Orbital imaging iv

  • 1. HEAD AND NECK IMAGING EHAB ABOU ELFOTOUH. MD. ORBITAL IMAGING IV
  • 2. CHOROIDAL HEMANGIOMA:  congenital vascular hamartomas.  Manifested in middle- aged or elderly people.  Equal distribution in both sexes.
  • 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. CHOROIDAL HEMANGIOMA:  CT imaging:  Solitary ill-defined mass.  Posterior chamber of the globe.  High CT attenuation.  Intense enhancement.  With or without retinal detachement.
  • 5. CHOROIDAL HEMANGIOMA:  At MR imaging:  A lenticular shape mass.  Ill defined margins.  Posterior chamber.  Hyperintense to vitreous on T1- weighted images.
  • 6. CHOROIDAL HEMANGIOMA:  On T2WIs, signals typically hyperintense.  Usually isointense to vitreous.  enhanced intensely after the administration of contrast material.
  • 7.
  • 8.
  • 9.
  • 10. 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.
  • 11. CHOROIDAL MELANOMA:  Tumors initially have a flat growth profile.  later become elevated.  Erupting through the Bruch membrane with characteristic mushroom shape.
  • 12. 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
  • 13. 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.
  • 14. CHOROIDAL MELANOMA:  At unenhanced CT:  Elevated posterior chamber mass.  Hyper-attenuating.  Sharply marginated.
  • 15. CHOROIDAL MELANOMA:  At enhanced CT:  Moderate intense enhancement.  With or without retinal detachment.  Orbital metastasis.
  • 16. 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.
  • 17. CHOROIDAL MELANOMA:  Markedly decreased signal intensity on T2WIs.  Among ocular tumors, only melanomas manifest these signal intensity character.
  • 18. CHOROIDAL MELANOMA:  Choroidal melanomas demonstrate moderate to strong enhancement.  Contrast-enhanced fat- suppressed MR imaging demonstrate scleral invasion, extension to optic disc, and
  • 19. CHOROIDAL MELANOMA:  Amelanotic melanomas has:  Isointense with vitreous on T1WIs.  slightly hypointense on T2-weighted images.
  • 20.
  • 21.
  • 22.
  • 23.
  • 24.
  • 25. 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.
  • 26. 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.