The term “cherry red spot” was used in 1887 by Bernard Sachs in his paper on “arrested development with special reference to its cortical pathology,” in describing the fundus of a child with “amaurotic familial idiocy.” The patient was confirmed on neuropathologic examination to have lipid storage in the brain [1]. Bernard Sachs acknowledged that his patient had also been seen by Herman Joseph Knapp, an ophthalmologist who practiced in New York and Berlin. Knapp had described the striking retinal findings at an ophthalmology meeting in Heidelberg, and had first used the term “cherry red color” to describe the fovea [2]. Subsequently, the disorder was established as Tay Sachs disease. Knapp had initially felt that the cherry red spot was a benign finding, but later realized its grave implications. This retinal appearance may also be seen in Sandhoff disease, sialidosis types I and II, galactosialidosis, GM1 gangliosidosis, GM2 gangliosidosis, Goldberg syndrome, metachromatic leukodystrophy, Niemann-Pick disease types A, B, C, and D, Farber lipogranulomatosis, multiple sulfatase deficiency, poisoning (dapsone), and Wolman disease (Table 1). The characteristic pale hue results from heavy deposition of lipid, sphingolipid, or oligosaccharide material in the ganglionic cells of the retina at the macula, where these cells are several layers thick. In the center of the pale region lies the foveal pit which lacks ganglion cells, and thus continues to retain its reddish appearance. The roving eye movements that accompany blindness can hinder visualizing the cherry red spot, thus at times necessitating a dilated eye examination under general anesthesia. The cherry red spot may become less prominent over time, concurrent with loss of the affected peri-macular ganglion cells [3]. Because the cherry red appearance (Fig. 1) of the retina is characteristic only of Caucasians, and because the retinal complexion differs based on ethnicity, it was suggested that the term “perifoveal white patch” may be more appropriate than cherry red spot [4]. The appearance of a cherry red spot may also result from retinal edema due to central retinal artery occlusion or traumatic retinal ischemia. Retinal ischemia causes the perimacular tissue to appear pale, while the fovea maintains its normal color. A macular hemorrhage or hole, with resulting enhanced red contrast
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