clinico-pathologic correlation: the alabama age-related maculopathy grading system (alarmgs)
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C.A. Curcio, 20030513, ALARMGS Tutorial
Clinico-pathologic Correlation:The Alabama Age-Related
Maculopathy Grading System (ALARMGS)
Christine A.Curcio, Ph.D.Department of Ophthalmology
University of Alabama at Birmingham
C.A. Curcio, 20030513, ALARMGS Tutorial
References
• Curcio CA, Medeiros NE, Millican CL: The Alabama Age-related Macular Degeneration Grading System for donor eyes. Invest Ophthalmol Vis Sci 1998, 39:1085-1096 (ALARMGS)
• Curcio CA, Millican CL: Basal linear deposit and large drusen are specific for early age-related maculopathy. Arch Ophthalmol 1999, 117:329-339 (Basal Deposits)
C.A. Curcio, 20030513, ALARMGS Tutorial
Introduction
• Macula: Topography and Layers• Bruch’s Membrane
C.A. Curcio, 20030513, ALARMGS Tutorial
Macula: Topography & Layers
PhRPE BrM ChC
PhotoreceptorsRetinal pigment epithelium
Bruch’s membraneChoriocapillaris
Cones Rods
Anatomical and epidemiologic macula:6 mm (21°) diameterSmall, cone-dominated foveaLarge, rod-dominated parafovea
C.A. Curcio, 20030513, ALARMGS Tutorial
Bruch’s Membrane:A Specialized Vascular Intima
• Intima (inner wall of large arteries)– Located between 2 diffusion barriers– Thickens throughout adulthood in response to
stress of blood flow– Collagen, elastin, proteoglycans
• Bruch’s membrane (a flat vessel wall)– Located between 2 diffusion barriers– Thickens (3X) throughout adulthood– Choroidal blood flow is 8-fold higher in macula
than periphery– Collagen, elastin, proteoglycans
ChC
RPE
L
3 EL
5 ChC-BL
2 ICL1 RPE-BL
4 OCL
C.A. Curcio, 20030513, ALARMGS Tutorial
Methods
• Photography• Grading
C.A. Curcio, 20030513, ALARMGS Tutorial
ALARMGS: Finding ARM Eyes
Eyes from 60-90 donors/ yr, < 4 hrs post-mortem Contact donor families/ eye doctorsDetailed gross and histopathologic exam
Curcio et al., 1998, IOVS 39: 1085
Post-mortem fundus Histopathologic evaluation Pre-mortem fundus
ALABAMAEYE BANK
C.A. Curcio, 20030513, ALARMGS Tutorial
Stereo dissecting scope
C.A. Curcio, 20030513, ALARMGS Tutorial
Normal Eye
Fovea -- all conesFovea -- all conesParafovea -- cones & rodsParafovea -- cones & rods
87 yr old man
C.A. Curcio, 20030513, ALARMGS Tutorial
WARMGS & ALARMGS
C.A. Curcio, 20030513, ALARMGS Tutorial
ALARMGS Study Design
C.A. Curcio, 20030513, ALARMGS Tutorial
34 eyes examined for fundus appearance and histopathology
• 26 human donors & 8 orbital exenteration patients
• <3.5 hr. from death/enucleation to preservative
• all > 50 years of age
• excluded diabetes, high myopia, non-ARM macular chorioretinal pathology
C.A. Curcio, 20030513, ALARMGS Tutorial
Clinical Information: Summary
ALARMGS eyes Felloweye age Sex OE LED (mo) VAcc Lens Phot/FA Significant macular history Hx A
1 OD 60 M x 0.0 20/30 2 x/- drusen, mild AMD Y2 OS 63 F 9.7 20/25+1 2 x/- dry AMD Y Y3 OS 64 M n.a. n.a. n.a. no visual complaint as per family Y4 OD 74 M 23.1 20/40- 3 x/- drusen and/or pigment changes Y Y5 OS 74 M 18.7 20/20 2 x/x dry AMD, drusen, pigment clumping Y N6 OD 74 M x 0.0 20/50 3 x/- prob MD, pigment clump, no drusen Y7 OS 75 M x 0.6 20/60ph40 2 drusen Y8 OS 80 M x 0.3 20/40-1 0 x/- few drusen, areas RPE atrophy Y9 OD 83 F 7.0 20/60 0 giant drusen, ARMD Y Y
10 OD 90 F n.a. n.a. n.a. n.a. Y
C.A. Curcio, 20030513, ALARMGS Tutorial
Histopathology Grades
Lesion 0 1 2 3 4
Total basal deposits none patchy thin continous thick continuous n.a.
Size of largest druse < 66 µm 63-125 µm ≥ 125 µm n.a. n.a.
Number of drusen none 1 to 3 > 3 n.a. n.a.
RPE morphology uniform nonuniform heaped or sloughed anterior migration atrophy
Detachment none RPE retina n.a. n.a.
Choroidal neovascularization none present n.a. n.a. n.a.
Photoreceptor outer segments normal shortened missing n.a. n.a.
Photoreceptor inner segments normal broadened missing n.a. n.a.
n.a. = not applicable
C.A. Curcio, 20030513, ALARMGS Tutorial
Early ARM: histopathology
• No changes of late ARM
AND
• EITHER 1 large druse (>125 microns)
• OR severe RPE change (heaping, migration, atrophy) with at least one druse or continuous
basal deposits.
C.A. Curcio, 20030513, ALARMGS Tutorial
Early ARM: post-mortem fundus appearance
No changes of late ARM AND
EITHER one large druse (> 125 microns) OR RPE hyperpigmentation >500 microns diameter
C.A. Curcio, 20030513, ALARMGS Tutorial
Review of Cases
C.A. Curcio, 20030513, ALARMGS Tutorial
Eyes with Drusen
• Case 1
• Case 3
• Case 4
• Case 5
• Case 2
• Case 9
C.A. Curcio, 20030513, ALARMGS Tutorial
Case 1
• 60 yr old man
• LED <1 mo, 20/30
• “drusen, mild AMD”
C.A. Curcio, 20030513, ALARMGS Tutorial
Case 3
• 64 yr old man
• No visual complaint as per family
C.A. Curcio, 20030513, ALARMGS Tutorial
Case 4• 74 yr old man
• LED 23.7 mo, 20/40-
• “dry ARM and pigment changes”
C.A. Curcio, 20030513, ALARMGS Tutorial
Case 5• 74 yr old man
• LED 18.7 mo, 20/20
• “drusen, RPE clumping”
C.A. Curcio, 20030513, ALARMGS Tutorial
Case 5
C.A. Curcio, 20030513, ALARMGS Tutorial
Case 7
• 75 yr old man
• LED 0.6 mo, 20/60
• “drusen”
C.A. Curcio, 20030513, ALARMGS Tutorial
Case 2
• 63 yr old woman
• LED 9.7 mo, 20/25+1
• Fundus photo 22 yr before death
C.A. Curcio, 20030513, ALARMGS Tutorial
Case 2
C.A. Curcio, 20030513, ALARMGS Tutorial
Case 9• 83 yr old woman
• LED 7.0 mo, 20/60
• “giant drusen”
C.A. Curcio, 20030513, ALARMGS Tutorial
Case 9
• 83 yr old woman
• LED 7.0 mo, 20/60
• RPE detachment
C.A. Curcio, 20030513, ALARMGS Tutorial
Eyes with Pigmentary Change
• Case 10
• Case 8
• Case 6
C.A. Curcio, 20030513, ALARMGS Tutorial
Case 10
90 yr old womanRPE clumpingThick deposits
C.A. Curcio, 20030513, ALARMGS Tutorial
Case 10
C.A. Curcio, 20030513, ALARMGS Tutorial
Case 8
• 75 yr old man
• LED 0.3 mo, 20/40
• “drusen, RPE atrophy”
C.A. Curcio, 20030513, ALARMGS Tutorial
Case 8
C.A. Curcio, 20030513, ALARMGS Tutorial
Case 6: Pattern Dystrophy
C.A. Curcio, 20030513, ALARMGS Tutorial
RPE Changes in ARM (1)• Early ARM
– Focal hyperpigmentation– Hypopigmentation (non-geographic atrophy)
• Late (geographic atrophy): 3 processes– Primary pigmentary change– Drusen regression– Resolution of CNV or detachment
• Risk due to hyperpigmentation = drusen
C.A. Curcio, 20030513, ALARMGS Tutorial
RPE Changes in ARM (2)
1 - Nonuniform size & pigment2 - Clumping, heaping3 - Anterior migration4 - Atrophy
C.A. Curcio, 20030513, ALARMGS Tutorial
RPE changes in ARM (3)
• Stage-specific increase in vimentin-immunoreactivity
Anti-VimentinAnti-Vimentin
Bright fieldBright field
AutofluorescenceGuidry C, Medeiros NE, Curcio CA.
IOVS 2002, 43:267-273.
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