minarcik robbins 2013_ch29-eye
TRANSCRIPT
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Pathology of the Pathology of the EyeEye
John R. Minarcik, M.D.John R. Minarcik, M.D.
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Outline and IntroductionSECTIONS1. Orbit2. Eyelid3. Conjunctiva4. Cornea5. Uvea6. Lens7. Retina/Vitreous8. Optic Nerve/Glaucoma
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Intro - Basic Anatomy
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THE ORBIT
• Anatomy
• Thyroid Orbitopathy
• Tumors
• Inflammation/Infection
• Trauma
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Orbit - Anatomy
• Bones of the orbit– Sphenoid– Maxillary– Ethmoid– Lacrimal– Zygoma– Palatine– Frontal
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Orbit - Osteology
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Orbit – Posterior Contents
• The ANNULUS OF ZINN is the tendon- ring that encircles the ON and acts as an origin for the muscles.
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Orbit – Anterior Boundary
• The ORBITAL SEPTUM is the anterior fascial boundary to the orbit
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Thyroid-Related Orbitopathy (Graves’ Disease)
• Autoimmune condition, triggered by TSH-R Antibodies, with lymphocytic infiltration, FIBROSIS, and ENLARGEMENT of extraocular muscles.
• Proptosis, strabismus/muscle-restriction, exposure problems (dry-eye), and compressive optic neuropathy.
• Treated with steroids, radiation therapy, or surgical decompression (opening the orbital walls into the sinuses)
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Orbit – Thyroid-Related Orbitopathy
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Orbit - Tumors
• Wide variety of lacrimal, lymphoid, neural, vascular, meningeal origin tumors, and metastatic tumors
• Children –rhabdomyosarcoma is the most common
primary malignancy of orbit.– neuroblastoma is most common metastatic
tumor
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Orbit - Inflammation• Orbital Cellulits frequently extends
from adjacent sinus infections, or periocular trauma.
• A life and sight threatening emergency! Can extend into the cavernous sinus, and brain.
• “Pre-Septal” vs. “Post-Septal” can be distinguished by involvement of intraorbital structures
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Orbit - Inflammation
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Orbit - Trauma• “Blow–out” fractures occur when
blunt trauma to the eye causes the orbit to rupture
• Orbital Floor fractures can cause restricted upgaze if there is muscle entrapment
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LIDS - Anatomy
LAYERS:
• Skin
• Orbicularis
• Tarsal plate
• Meibomian glands
• Palpebral conjunctiva
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LIDS - Histology
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LIDS - Tumors
• Malignant– Basal cell carcinoma - most
common – Squamous– Melanoma– Sebaceous cell carcinoma
• Benign– Chalazion vs. Hordeolum– Papillomas/Verrucae– Epidermal inclusion cysts– Many others…
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LIDS - Tumors
• Chalazion – a cyst of the meibomian gland• Hordeolum – an inflammed cyst of the MG
(foreign body granuloma)
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Conjunctiva
• Thin, non-keratinized skin covering the sclera (bulbar) or the inner surface of the lid (palpebral)
• Rich in goblet cells, which secret the mucinous components of the tear film
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Conjunctiva
• The bulbar layer is continous with the palpebral layer
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Conjunctiva – Pathologic conditions
• Conjunctivitis (“pink-eye”) – is an inflammation of the conjunctiva due to a viral (Adenovirus), bacterial, or allergic cause.
MALT, germinal centersMALT, germinal centers
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Conjunctivitis
- Cat-scratch Fever!
- Bartonella henselae
• A rare granulomatous A rare granulomatous variety…variety…
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Conjunctiva – Degenerative conditions
• Pinguecula – on the conj only
• Pterygium – encroaching onto cornea
• Histologically identical
• Both involve “elastotic degeneration” of the conjunctiva, usually due to chronic ultraviolet exposure.
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Conjunctiva – Degenerative conditions
• Small pinguecula • Pterygium
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Conjunctiva - tumors
• Conjunctival intraepithelial neoplasia (CIN)
• Squamous Cell
• Melanoma
• Lymphoid - arising from mucosa-associated lymphoid tissue (MALT)
LymphomaLymphoma
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Conjunctiva
• CIN (squamous cell), HPV 16/18
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Cornea
The cornea is a unique transparent and avascular tissue that is the most important refractive structure of the eye.
• Anatomy
• Inflammation/Infection
• Dystrophy/Ectasia
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Cornea - Anatomy
5 Layers:1. Epithelium – Continuous with conj, richly innervated by
CN-V1
2. Bowman’s Membrane 3. Stroma – The thickest central portion (90%). This is
where LASIK/Refractive surgery happens! Primarily made up of Type 1 Collagen in uniformly-spaced lamellar bundles.
4. Descemet’s membrane5. Endothelium – pumps the water out of the cornea and
keeps it clear
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Cornea
The uniform spacing of the stromal collagen bundles at a The uniform spacing of the stromal collagen bundles at a distance of approx ¼ wavelength light allows transparency.distance of approx ¼ wavelength light allows transparency.
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Cornea - Refractive Surgery
• Excimer Laser is applied to the stromal bed, underneath a reflected corneal flap (LASIK).
• The tissue is ablated precisely to counteract the refractive error of the eye.
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LASIK – Traumatic Flap Dislocation
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Cornea – Inflammation/Infection
Keratitis – inflammation of cornea
• Bacterial ulcer – Frequent in contact lens users, Pseudomonas most common
• Viral – Herpes (HSV) is a frequent etiology
• Autoimmune, Syphilis, Fungal, ameobic, and many other types
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Cornea - HSV Keratitis
• Epithelial “dendritic” Keratitis
• Stromal Keratits (note the vessels and clouding)
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Cornea - Bacterial Ulcer
Epithelial defect, infiltrate of white cells into the cornea, and a layered leukocyte collection in the AC (Hypopyon)
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Cornea – Stromal Dystrophy
• Dystrophy – a heritable disorder resulting in abnormal tissue morphology, function, or abnormal depositions of material into the cornea.
• MANY types, affecting each specific layer.
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Cornea – Stromal Dystrophy
• Granular Dystrophy • Hyaline material deposited in stroma
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Cornea – Stromal Dystrophy
• Lattice Dystrophy• Amyloid deposition with
“apple-green” birefringence. Stains with Congo Red
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Cornea - Ectasia
• Progressive deformation of cornea is an ectasia. Keratoconus is the most common ectatic dystrophy. Ectasia can also be a complication of refractive surgery…
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Cornea Transplant
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THE UVEA
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The Uvea
“The uvea” is:1. The Iris
2. The Ciliary body
3. The Choroid
Each has a function1. Iris is a diaphragm for light
2. Ciliary body suspends and “flexes” the lens, and makes the aqueous humor
3. The choroid helps nourish the outer retina
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The Uvea - Angle
• The “angle” is a special region of the uvea where the iris meets the cornea– Regulates the outflow of Aqueous humor through the
Canal of Schlem – Determines the Intraocular pressure (Important in
Glaucoma)
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The Uvea - Inflammation
• “Uveitis” is inflamation of any combination of the iris, ciliary body, or choroid.
• Many etiologies (autoimmune, syphilis, sacrcoid, TB, HLA-B27, infectious, idiopathic, etc…)
• Many names (iritis, anterior uveitis, iridocylitis, choroiditis, etc…) depending on the location
• Sometimes associated with SERIOUS systemic inflamatory diseases (eg. arthritic diseases), inflamatory bowel disease, and vasculitis.
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The Uvea – Anterior Uveitis
• Anterior uveitis/iritis • WBCs floating in the aqueous
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Uvea – Posterior Uveitis
• Active Toxoplasmosis Choroiditis, and old scar (above)Active Toxoplasmosis Choroiditis, and old scar (above)
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The Uvea - Tumors
• The Choroid is a highly perfused vascular “net” feeding the outer retina
• It is a potential target site for metastasis for carcinoma, such as breast and lung.
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The Uvea - Tumors
• The uvea (especially choroid) is also richly pigmented, and primary melanocytic tumors are common.
• Nevi and malignant melanomas are both relatively common, and can be difficult to distinguish, clinically.
• Tumors with “spindle-B” or epithelioid histologic patterns are malignant
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THE LENSTHE LENS
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The Lens
• A transparent, avascular structure consisting of concentric cellular fibers
• Highest protein content of the body (Crystallins), which account for a high refractive index
• Interaction of the ciliary body muscle, through the zonular fibers, cause dynamic shape changes.
• In concert with the cornea, helps to focus light on the retina.
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The Lens
• The deepest fibers are the oldest ones
• The lens continues to fatten throughout life
• Central fibers become sclerotic and opaque with time
• Entire structure encapsulated
• Lens cells migrate and elongate into fibers
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The Lens - Cataract
Opacities of the lens develop with time, or insultOpacities of the lens develop with time, or insult• UV light, steroids, and inflammation are pathogenic factorsUV light, steroids, and inflammation are pathogenic factors
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The Lens – Cataract surgery
• A opening into the lens capsule is made
• The cataract is emulsified with ultrasound energy, and aspirated out of the eye
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The Lens – Cataract surgery
• The dense, cloudy crystalline lens is removed, and replaced with an optical implant.
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The RetinaThe Retina
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The Retina
• Anatomy• Detachment• Vascular disease/Ischemic retinopathy
– Microvascular (Diabetes)– Vascular occlusion (Vein occlusion/Arterial
Occlusion)
• Macular degeneration• Tumors
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The Retina - Anatomy
Cell types (overview)• Photoreceptors (detect
light signal)• Bipolars
transmit/modulate signal to ganglion cells
• Ganglion cells send signal by long axons through optic nerve and into visual pathways of the brain
• Other cell types…
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The Retina - AnatomyLayers (inside to out):
1. Inner limiting membrane
2. Nerve Fiber Layer
3. Ganglion Cell Layer
4. Inner plexiform layer
5. Inner nuclear layer
6. Outer plexiform layer
7. Outer nuclear layer
8. Photoreceptor segments
9. Retinal Pigment Epithelium
10. Bruch’s Membrane
(Choroid)
(Sclera)
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Retina – Anatomy
Pathologic conditions of layers
1) Retinal detachment: Separation between RPE and photoreceptor segments
2) Macular degeneration: Bruch’s membrane damaged by deposition of drusen, allowing leaky choroidal vessels to grow into retina (exudative type).
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The Retina - Detachment
Retinal tears are the most frequent causes of detachment (rhegmatogenous RD)
Tears can be “spot welded” with laser to prevent detachment
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Retinal DetachmentRetinal Detachment
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The Retina – Macular degeneration
• Clinical appearance of drusen in Macular degeneration
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The Retina – Vasculopathy
• Microvascular (small vessel disease)– Diabetes
– Sickle Cell
– Radiation
• Macrovascular (large vessel occlusions)– Central retinal vein occlusion (CRVO)
– Branch retinal vein occlusion (BRVO)
– Central retinal artery occlusion (CRAO)
– Branch retinal artery occlusion (BRAO)
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The Retina – Diabetic RetinopathyMicrovascular dysfunction leads to tissue ischemia– Thickened and Leaky Capillary
basement membranes– Loss of pericytes– Microaneurysms– Nonperfusion
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The Retina – Diabetic Retinopathy
Ischemia leads to vascular endothelial growth factor (VEGF) production from injured tissues– Promotes Neovascularization (abnormal blood
vessel growth) of the retina, optic nerve, or iris.– Abnormal vessels can cause edema or tractional
retinal detachments– VEGF implicated in other ischemic eye
diseases, like Retinopathy of Prematurity
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• Microaneurysms!• Capillary dropout and
Nonperfusion!• Neovascularization!
The Retina – Diabetic Retinopathy
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• Retinal neovascularization
The Retina – Diabetic Retinopathy
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The Retina – MACROvascular Disease
• CRVO/BRVO – variety of anatomical prothrombotic predispositions
• CRAO/BRAO – watch out for carotid/cardiac embolic disease, or vasculitis.
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The Retina – Macrovascular disease
CRVO – Hemorrhage, congestion, ischemia
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Ischemic CRVO led to VEGF production, which caused neovascularization of iris.
The Retina – Macrovascular disease
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The Retina - Tumors
Retinoblastoma
• Classic pediatric tumor of retina
• Hereditary or Sporadic
• Requires two gene mutations (Knudsen’s “two-hit” hypothesis)
• Classic histologic features of Flexner-Wintersteiner Rosettes, and fleurettes
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OPTIC NERVEOPTIC NERVE
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Pathologic Conditions of the Optic Nerve
• Ischemic Neuropathy – due to arteritic (Giant Cell Arteritis) or non-arteritic causes.
• Optic Neuritis –Many causes, but demyelinating (Multiple Sclerosis) causes are most important
• Papilledema – swelling due to increased intracranial pressure
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Optic Nerve – Pathologic conditions of…
• Glaucoma – progressive injury of optic nerve, frequently associated with elevated intraocular pressure
- Characteristic “cupping” of nerve
- Loss of retinal nerve fiber layer
- Advancing peripheral visual field loss
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Optic Nerve - Glaucoma
• Loss of rim correlates to loss of axons from ganglion cells in retina (Nerve fiber layer).
• Regions of lost ganglion cells/axons cause visual field loss.
NormalNormal CuppedCupped Advanced GlaucomaAdvanced Glaucoma
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This Concludes Eye PathologyThis Concludes Eye Pathology
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Summary of *key* topics:
Thyroid orbitopathy
“Ditzels” on the front of the eye
Corneal layers
Uveitis as a manifestation of systemic disease
Lens and cataract
Diabetic Retinopathy
Retinal Detachment
Glaucoma
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Final discussion points?