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Giuseppe Querques

Department of Ophthalmology, IRCCS Ospedale San Raffaele, University Vita Salute San Raffaele, Milan, Italy

Angio-OCT Degenerazione Maculare Legata all’Eta ̀

ADVISORY BOARD MEMBER:

• Allergan

• Bayer

• Novartis

Financial Disclosure

CONSULTANT:

• Alimera sciences

• Allergan

• Bayer

• Bausch and Lomb

• Heidelberg

• Novartis

• Zeiss

• Classification made by GASS

– Type 1 > Sub-RPE > occult neovascularization

Classification of Neovascularization

TYPE 1 NEO

Courtesy of L. Yannuzzi

TYPE 1 NEO

TYPE 1 NEO - OCTA

– Type 2 > Sub-retinal > visible neovascularization

TYPE 2 NEO

Courtesy of L. Yannuzzi

TYPE 2 NEO

TYPE 2 NEO - OCTA

– Type 3 Neovascularisation: introduced by Freund in 2008

• Several anatomical findings corresponding to type 3 neovascularization have been described in the past – Hartnett 1992 « Abnormal deep retinal vascular complexe » – Khun 1995 « Chorio-Retinal Anastomosis » (CRA) – Yanuzzi 2001 « Retinal Angiomatous Proliferation » (RAP) – Gass 2003 « Occult choroidal retinal anastomosis » (OCRA

YANNUZZI PROPOSED THREE VARIANTS IN THE VASOGENIC PROCESS:

1. Initial focal retinal proliferation and progression

2. Focal retinal proliferation with preexisting or simultaneous choroidal proliferation

3. Initial focal choroidal proliferation and progression

Type 3 Neovascularization

• The intraretinal neovascular complex appears as a hyper-reflective lesion located in the outer retina adherent to the underlying RPE

• A focal discontinuity of the RPE band through which the hyper-reflective intra retinal lesion communicated with the underlying material within drusen or drusenoid PED

• No evidence of a communication with the choroid

Multimodal Imaging of Type 3 Neo

• Primarily intraretinal proliferation and anastomoses between retinal vessels and evolving type 1 neovascular tissue within underlying drusen or drusenoid PEDs without evidence of anastomoses with the choroidal circulation

Multimodal Imaging of Type 3 Neo

Querques, Souied, Freund. Retina 2013

• However, in vivo imaging does not allow us to conclusively rule out preexisting Type 1 neovascularization or even early RCA

TYPE1 NEO quiescent

2012 2014

Editorial

Vascular ized Drusen

Slowly Progressive Type 1 Neovascular izationMimicking Drusenoid Retinal Pigment EpitheliumElevation

Age-related macular degeneration (AMD) is theleading cause of vision loss in patients above 50

years.1 Early AMD is characterized by the presence ofmacular drusen and retinal pigment epithelium (RPE)changes. Drusen are formed by material under theRPE (extracellular debris of varying compositionlocated between the basal lamina of the RPE and theinner collagenous layer of the Bruch membrane insize)2–6; they have been classically characterized ashard or soft, and small (, 63 mm), intermediate(. 63 mm but , 125 mm), or large (. 125 mm).7,8 Softdrusen are mound-like elevations, typically 63 mm to. 1.000 mm. Different studies have indicated thatlarge, soft, confluent drusen (but not small harddrusen) should be considered as the main factor asso-ciated with a greater risk for developing advancedAMD.7–10 Almost 80% of patients with AMD withvision loss have the exudative advanced form of thedisease,11 which is characterized by the developmentof choroidal neovascularization (CNV) in the sub-RPEspace (Type 1 neovascularization), or in the subretinalspace (Type 2 neovascularization),12,13 accompaniedby exudative retinal changes; the remaining 20% ofthe patients with AMD who develop marked visionloss have the atrophic form of the disease.

In soft drusen, optical coherence tomography (OCT)shows the deposition of material under the RPE.6

Drusen are dynamic, with growth, regression of somedrusen, and the formation of new drusen (that canoccur simultaneously in the same macula).14,15 Drusengrowth is characterized by the continuous depositionof sub-RPE material (i.e., membranous debris). Drusenregression is characterized by reduced deposition and

elimination by macrophages of sub-RPE membranousdebris, with material not removed that develops calci-fication.16 We recently described a novel OCT findingappearing as multilaminar sub-RPE hyperreflectivityin eyes with regressing drusen, which we interpretedas layers of lipid mineralization (i.e., membranousdebris developing calcification).17 However, giventhe similitudes with the recently reported layers oftissue within vascularized pigment epithelium detach-ment (PED), which Spaide suggested to represent sub-RPE neovessels,18 we did not exclude the presence (atleast in some cases) of subclinical (without exudativeretinal changes) focal neovascularization localizedwithin regressing drusen as a possible explanationfor the multilaminar sub-RPE hyperreflectivity.17 Theconflicting interpretation (layers of lipid mineralizationvs. sub-RPE neovessels) isnot aproof of the limitationof OCT technology but rather points out the ability ofOCT technology to reveal novel sub-RPE anatomicdetails. Of note, regressing drusen typically portendthe development of drusen-associated atrophy, andnot the abnormal growth of newly formed vessels.However, Type 1 neovascularization (in the sub-RPEspace), without exudative retinal changes, has beenrecently described under the definition of “quiescent”CNV.19 Quiescent CNV was described on spectral-domain OCT (SD-OCT) as a stable irregularly slightlyelevated RPE, without hyporeflective fluid accumula-tion in the intraretinal/subretinal space, showinga major axis in the horizontal plane.19 Indeed, currenthigh-resolution multimodal imaging, including split-spectrum amplitude-decorrelation angiography withOCT, strongly suggests that Type1 neovascularizationwithout exudative retinal changes may also presentwith different SD-OCT features than those reportedfor quiescent CNV (i.e., dome-shaped RPE elevationswith or without multilaminar hyperreflectivity inside).

Drusenoid RPE elevations presenting on SD-OCTmultilaminar hyperreflectivity and collections of

None of the authors have any financial/conflicting interests todisclose.

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