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Ophthalmology – Acute Multifocal Placoid Pigment Epitheliopathy (AMPPE)
Acute multifocal placoid pigment epitheliopathy (AMPPE) is a rare, acquired inflammatory disorder affecting the retinal pigment epithelium (RPE) and choroid. It typically presents with multiple yellowish-white placoid lesions at the level of the RPE, most often involving the posterior pole and macula. The condition is frequently bilateral, and lesions are often seen in different stages of evolution, with healing characterized by areas of RPE hyperplasia. AMPPE is generally considered a self-limited condition, although it can occasionally be associated with systemic complications.
The exact incidence is unknown due to its rarity. Some genetic associations have been reported, particularly with HLA-B7 and HLA-DR2, suggesting a possible immunologic predisposition. The underlying pathophysiology is thought to involve choroidal vascular compromise, leading to secondary ischemia and inflammation of the RPE. Although the precise etiology remains unclear, approximately one-third of patients report a preceding viral-like illness, supporting the possibility of an immune-mediated or post-infectious mechanism.
Patients typically present with sudden, painless visual loss, which may affect one or both eyes. Visual symptoms can include blurred vision or scotomas. On funduscopic examination, characteristic findings include multiple, flat, yellowish-white lesions at the level of the RPE and choroid, often located in the macular region. These lesions may appear in various stages, with some resolving while others are newly forming. As lesions heal, they leave behind areas of pigmentary change due to RPE alteration.
Fluorescein angiography is helpful in confirming the diagnosis, demonstrating early hypofluorescence of the lesions due to blockage or nonperfusion, followed by late hyperfluorescence as dye leaks into the affected areas. The differential diagnosis includes other inflammatory and infectious chorioretinal diseases such as serpiginous choroiditis, ampiginous chorioretinitis, ocular toxoplasmosis, sarcoidosis, ocular lymphoma, and Vogt-Koyanagi-Harada disease.
Management is typically conservative, as most cases resolve spontaneously without treatment within several weeks. Visual recovery usually occurs over 3 to 4 weeks. In cases where the fovea is involved and vision is significantly affected, a short course of systemic corticosteroids may be considered, although evidence supporting this approach is limited. Patients should be referred to a retinal specialist for confirmation of diagnosis and monitoring.
Close follow-up is important to ensure resolution and to monitor for rare complications. Recurrence is uncommon, and repeated episodes should prompt reconsideration of the diagnosis. A critical but rare complication is cerebral vasculitis, which can be life-threatening; therefore, any associated neurological symptoms such as altered mental status require urgent neurological evaluation. The prognosis is generally favorable, with most patients regaining good visual acuity unless significant RPE damage occurs in the foveal region.
Acute multifocal placoid pigment epitheliopathy (AMPPE) is a rare, acquired inflammatory disorder affecting the retinal pigment epithelium (RPE) and choroid. It typically presents with multiple yellowish-white placoid lesions at the level of the RPE, most often involving the posterior pole and macula. The condition is frequently bilateral, and lesions are often seen in different stages of evolution, with healing characterized by areas of RPE hyperplasia. AMPPE is generally considered a self-limited condition, although it can occasionally be associated with systemic complications.
The exact incidence is unknown due to its rarity. Some genetic associations have been reported, particularly with HLA-B7 and HLA-DR2, suggesting a possible immunologic predisposition. The underlying pathophysiology is thought to involve choroidal vascular compromise, leading to secondary ischemia and inflammation of the RPE. Although the precise etiology remains unclear, approximately one-third of patients report a preceding viral-like illness, supporting the possibility of an immune-mediated or post-infectious mechanism.
Patients typically present with sudden, painless visual loss, which may affect one or both eyes. Visual symptoms can include blurred vision or scotomas. On funduscopic examination, characteristic findings include multiple, flat, yellowish-white lesions at the level of the RPE and choroid, often located in the macular region. These lesions may appear in various stages, with some resolving while others are newly forming. As lesions heal, they leave behind areas of pigmentary change due to RPE alteration.
Fluorescein angiography is helpful in confirming the diagnosis, demonstrating early hypofluorescence of the lesions due to blockage or nonperfusion, followed by late hyperfluorescence as dye leaks into the affected areas. The differential diagnosis includes other inflammatory and infectious chorioretinal diseases such as serpiginous choroiditis, ampiginous chorioretinitis, ocular toxoplasmosis, sarcoidosis, ocular lymphoma, and Vogt-Koyanagi-Harada disease.
Management is typically conservative, as most cases resolve spontaneously without treatment within several weeks. Visual recovery usually occurs over 3 to 4 weeks. In cases where the fovea is involved and vision is significantly affected, a short course of systemic corticosteroids may be considered, although evidence supporting this approach is limited. Patients should be referred to a retinal specialist for confirmation of diagnosis and monitoring.
Close follow-up is important to ensure resolution and to monitor for rare complications. Recurrence is uncommon, and repeated episodes should prompt reconsideration of the diagnosis. A critical but rare complication is cerebral vasculitis, which can be life-threatening; therefore, any associated neurological symptoms such as altered mental status require urgent neurological evaluation. The prognosis is generally favorable, with most patients regaining good visual acuity unless significant RPE damage occurs in the foveal region.
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