The cherry-red spot refers to the reddish area at the center of macula surrounded by retinal opacification in certain disorders. The retinal opacification may be due to various causes including accumulation of different materials in the ganglion cells in storage disorders, and retinal ischemia/infarction as in central retinal arterial occlusion (CRAO).
Ruling out serious life-threatening or sight-threatening diseases is of paramount importance in a patient with a cherry-red spot at the macula. The management varies according to the cause.
The causes of the cherry-red spot include:
The association between Gaucher disease and cherry red spots at the macula is questionable.
Cherry red spot at the macula is a rare finding, and the epidemiology depends on the cause. Tay-Sachs disease is estimated to affect 1 in 320000 newborns. The true epidemiology of central retinal arterial occlusion is unknown. A study estimated that acute central retinal arterial occlusion( duration less than 48 hours) affects approximately '0.85 per 100000 per year or 1.13 per 10000 outpatient visits'.
The macula is characterized histologically by an area with more than one layers of ganglion cell layers, and the ganglion cell layer is thick at the macula. In diseases causing loss of transparency (whitening or opacification) of the inner retina, the reddish color of the vascular choroid and pigmentation of retinal pigment epithelium (RPE) is not seen through the opacified retina. However, foveola is devoid of inner retinal layer. The retinal layers present at the foveola are (from inside outwards)- internal limiting membrane, outer nuclear layer, external limiting membrane, photoreceptor layer, and RPE. Inner retinal layers are absent in mature foveola. The vascular supply of the fovea is from the choroid and in the occlusion of retinal vessels, it does not get hampered. Thus foveola, the thinnest part of central retina does not lose its transparency in inner retinal ischemia.
Thus, when there is inner retinal opacification, the reddish color of the vascular choroid and the RPE is still seen through the foveola which is surrounded by an area of the white/opacified retina; this gives rise to the typical cherry-red spot. The size of the cherry red spot depends on the size of foveola.
As the color of choroid and RPE varies with racial variation, the color of foveola or the central dot may change according to race. A true cherry-red spot presents in Caucasians. The color of foveola was brown causing cherry brown spot in Canadian aboriginal child with Sandhoff disease and black in a patient of east Indian race creating a cherry black spot in Sandhoff disease. Thus an alternate name of 'perifoveal white patch' has been suggested.
Therefore for cherry-red spot to be seen, the vascularity of choroid needs to be intact. In cases of ophthalmic artery occlusion, there is a compromise to the vascular supply to retina, choroid and optic nerve head circulation. There is retinal opacification without cherry red spot and severe vision loss which might cause no perception of light or inaccurate projection of rays.
The opacification of inner retinal may be due to:
Sphingolipidoses are disorders of lysosomal metabolism which involve conjugated products of ceramide and sugar or phospholipids. Sphingolipidoses include gangliosidosis, Niemann-Pick disease, Farber disease, and metachromatic leukodystrophy.
Tay-Sachs disease demonstrates an accumulation of GM2 gangliosides in the brain, spinal cord, heart, liver, spleen, and ganglion cells of the retina. Typically, a ballooned appearance of the neurons is a feature which has vacuoles in the cytoplasm composed of distended lysosomes filled with gangliosides. Stain with oil red O or Sudan black B is positive. Electron microscopy reveals whorled deposits within lysosome which have a multilayered appearance like a cut section of an onion.
In CRAO, the early changes are ischemic changes and swelling of the inner retina which is with time followed by thinning of inner retinal layers.
Central retinal artery occlusion usually presents with sudden onset vision loss in the elderly. Often, there is a relative afferent pupillary defect in the affected eye. Fundus examination reveals a whitened opaque retina at the posterior pole blocking the visibility of choroidal vessels. The foveola remains transparent giving rise to the cherry red spot. Other features include fragmentation of blood column in retinal vessels ("box-carring") which may be noted to move sluggishly on prolonged observation. An embolus within the central retinal artery or its branches may be present. In the late phase, retinal thinning, pigmentary changes at the fovea, and optic atrophy may occur.
In lipid storage disorders, there might be evidence of neurodegeneration and visceromegaly. In the early phase, there is a perifoveal white donut-like area around the fovea with a cherry red spot appearance. In the late phase, there is atrophy of inner retinal layers, the disappearance of the cherry red spot and optic atrophy. Family history and examination of family members are of paramount importance.
Fundus fluorescein angiography (FFA) shows delayed arterial circulation, a slowly progressing front edge of the dye, and late filling of the retinal veins in central retinal artery occlusion. There may be an abrupt ending to the flow of the dye at the location of an embolus in the central retinal artery or its branches. In lipid storage disorders, FFA may show an area of hypofluorescence (block fluorescence) 360 degrees around the foveola.
The optical coherence tomography (OCT) in CRAO shows hyperreflectivity of inner retinal layers and retinal thickening. In lipid storage disorders, there is hyperreflectivity of the nerve fiber layer and the ganglion cell layer on OCT. In commotio retinae, OCT usually does not show an increased thickness of the retina, but there may be hyperreflectivity of the inner segment-outer segment (IS-OS) junction with or without defects in IS-OS junction, external limiting membrane (ELM), or cone outer segment tips (COST) line.
In suspected lipid storage disorder, evaluation for enzyme deficiency, and multisystem involvement is essential.
The management of the cherry red spot depends on the cause.
Ruling out serious life-threatening or sight-threatening diseases is of paramount importance in a patient with a cherry-red spot at the macula. The management varies according to the cause. When the nurse practitioner, primary care provider or emergency department physician encounters patients with vision alterations, referral to an ophthalmologist is the strong recommendation. Given the variety of potential etiologies for this condition, an interprofessional team approach involving physicians and nursing professionals is the best way to ensure proper diagnosis and treatment for the underlying disease state.
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