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with retinal pathology. The classical histological finding is cystoid

 

bodies. There may also be retinal edema, hard exudates, and/or hemor-

 

rhages. Abnormalities in retinal vasculature, including narrowing, dila-

 

tation, and microaneurysms, may be noted. Severe occlusive retinopathy

 

or vasculitis due to SLE presents histopathologically with perivascular

 

lymphocytic infiltrates, endothelial swelling, and thrombosis, leading

 

to occlusion of retinal and choroidal vessels. These vascular occlusion

 

processes lead to a proliferative retinopathy with neovascularization,

 

which in turn can lead to vitreous hemorrhage and tractional retinal

 

detachment. Other histopathological features which may be seen

 

include macular exudates and RPE changes.41

 

 

 

IMPLICATIONS FOR RETINAL

 

PHARMACOTHERAPY

 

While the etiologies of retinal diseases vary widely – from developmen-

A

tal anomalies to age-related degenerations and from infectious diseases

 

of the retina to systemic vascular diseases – the ensuing histopathologi-

 

cal changes in the retina share some similarities with one another.

 

Neovascularization and inflammation are two key examples of such

 

common denominators. Neovascularization, for instance, is a key his-

 

topathological feature with notable clinical consequences in a spectrum

 

of diseases, including retinopathy of prematurity, AMD, retinal detach-

 

ment, SLE, diabetic retinopathy, and sickle-cell retinopathy, to name a

 

few. These shared features suggest that there are certain major patho-

 

logical processes – angiogenesis and inflammation, for example – in

 

retinal diseases which may be amenable to therapy. Thus, therapies

 

countering these processes may promise to target multiple, seemingly

 

disparate retinal diseases, providing an added incentive to develop

 

novel therapeutic strategies targeting these key processes.

B

*

C

Figure 2.8  Histological representations of sickle-cell disease retinopathy. (A) Photomicrograph of retina from a patient with sickle-cell disease. Sickled red blood cells (arrow) are visible in a retinal vascular lumen. (Hematoxylin and eosin, original magnification ×200.) (B) Photomicrograph of a retina from a patient with sickle-cell disease. Sclerotic blood vessels are visible in the inner retina. (Hematoxylin and eosin, original magnification ×100.)

(C) Photomicrograph of retina from a patient with sickle-cell disease. Retinal “sea fan” neovascularizations (arrows), and retinal cystic degeneration (asterisk) are notable. (Hematoxylin and eosin, original magnification ×200.)

SUMMARY AND KEY POINTS

The retina comprises the major neurosensory tissue related to the vision process, and includes the photoreceptor cells, which first receive the visual stimuli, the RPE cells, which maintain retinal and especially photoreceptor homeostasis, a variety of neurons such as bipolar cells, amacrine cells, and horizontal cells, which modify the visual stimulus, and ganglion cells, whose axons carry the signal from the retina to the optic nerve and finally to the brain. Retinal pathology, including congenital anomalies, degenerations, dystrophies, toxicities, inflammation, detachments, neoplasms, trauma, and involvement of systemic diseases, result in disruption of this delicate retinal architecture, leading eventually to clinical manifestations. Though the specific array of histopathological changes involved varies from disease to disease, many retinal maladies share certain key pathophysiological changes that may be amenable to pharmacotherapy. However, pharmacotherapy may not be effective once retinal atrophy, the end stage of most retinal diseases, has occurred.

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