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Tumors of the Retinal Pigment Epithelium :Congenital Hypertrophy of the RPE (CHRPE)
Benign melanoma of the RPE
Polar bear tracks
Pigmented ocular fundus lesion (POFL)
Congenital hypertrophy of retinal pigment epithelial cells.
The etiology of CHRPE is unknown but it is believed to be a congenital lesion.
CHRPE is a flat, pigmented lesion with sharp borders at the levels of RPE. They are usually unilateral with round, dark pigmentation, but can contain areas of hypopigmentation or depigmentation known as lacunae (Figure 1). They can also be completely depigmented in rare instances. Solitary CHRPE are isolated findings with no known systemic associations. CHRPE can be seen in groups, commonly occurring unilaterally in a single sector. These lesions are called bear tracks because of their resemblance to paw prints. Like CHRPE, bear tracks are not associated with systemic conditions.