Acute Posterior Multifocal Placoid Pigment Epitheliopathy
Acute posterior multifocal placoid pigment epitheliopathy (APMPPE) is an inflammatory chorioretinopathy which was first described by Gass in 1968 . It is classified as a White Dot Syndrome and is uncommon, with an estimated incidence of 0.15 cases per 100,000 persons . APMPPE is usually bilateral, affects women and men equally, has a tendency to occur between the 2nd to 4th decades, and can have associated systemic conditions. The most common complaint is blurred vision with central or paracentral scotomas, which may be associated with a flu-like prodrome and headache. Other visual symptoms can include photopsia and metamorphopsia. The classic finding on DFE is creamy yellow or grey-white placoid lesions at the level of the RPE in the posterior pole . Cases are often self-limited and visual symptoms resolve by 4 to 8 weeks. There is no consensus on treatment, however steroids have been attempted to hasten visual recovery especially in cases with macular involvement or with neurological symptoms due to a risk for comorbid cerebral vasculitis . Recurrence is rare, but typically has been reported with worse prognosis and a diagnosis of relentless placoid chorioretinitis should be considered if persistent beyond 6 months .
In 1968, Gass first described acute posterior multifocal placoid pigment epithelium (APMPPE) by presenting the clinical and fluorescein angiography findings in three young females with bilateral central vision loss .
Several hypotheses regarding the underlying aetiology for APMPPE have been proposed. In its original description in 1968, Gass chose the term ‘Pigment Epitheliopathy’ to reflect what he thought was the tissue most significantly affected.  Following the development of fundus fluorescein angiography, Van Buskirk et al, and Deutman et al proposed choriocapillaris ischemia as the more likely primary etiology. However, a direct neurotropic infection hypothesis has recently been proposed by Steptoe et al.  In contrast to a primary choriocapillaris pathology, changes within the retinal nerve fibre layer were demonstrated to occur prior to changes within the outer retina and the occurrence of axonal spheroids described to occur along the unmyelinated photoreceptor axons which constitute the Henle fibre layer. 
Approximately 33% of patients report a preceding viral or flu-like illness prior to APMPPE symptom onset . APMPPE has been described in cases of thyroiditis, erythema nodosum, granulomatosis with polyangiitis, polyarteritis nodosa, nephritis, sarcoidosis, scleritis, ulcerative colitis, central nervous system (CNS) vasculitis, and post-vaccination . Culprit vaccinations may include Polio, Tetanus, varicella, hepatitis A, hepatitis B, meningococcal C, yellow fever, typhoid, and influenza . Other infectious associations include group A streptococcus, adenovirus-5, influenza, coxsackie-B, influenza, hepatitis B, Lyme disease, mumps, and tuberculosis. Genetics may play a role in an individual’s risk for APMPPE as several associations have been reported including HLA-B7 and HLA-DR2 genetic haplotypes .
The exact pathogenesis is controversial. An older theory, proposed by Gass, posits that inflammation in the outer retina and RPE produces the APMPPE phenotype of characteristic placoid lesions . A second theory proposed by Van Buskirk is an occlusive vasculitis, potentially due to inflammatory or autoimmune processes, at the level of the choriocapillaris resulting in hypoperfusion and ischemia of the RPE and photoreceptors. Ischemic injury to the RPE and outer retina then yields the characteristic placoid appearance . In later stages, the inflamed choroid and retina manifests with RPE atrophy and hyperpigmentation . Thus, the prevailing theory argues that a primary affectation of the choriocapillaris leads to secondary injury of the RPE and outer retina. The end result of the disease process is atrophy of the choriocapillaris, RPE, and photoreceptors. Of note, some authors have argued that choroidopathy may be a more appropriate name that epitheliopathy .
There are no recognized preventative measures.
Diagnosis is made via clinical presentation and fundoscopic examination with or without additional imaging. Fluorescein angiography is helpful in confirming the diagnosis. Some have advocated for the use of a multimodal imaging approach that includes fluorescein angiography, indocyanine green angiography, spectral domain optical coherence tomography, optical coherence tomography angiography (OCTA), and fundus autofluorescence .
Patients typically notice a rapid onset of blurred vision associated with central and paracentral scotomas. Photopsias and metamorphopsia have been reported prior to vision loss . Symptoms are usually bilateral, asymmetric and can occur several days apart. Visual acuity can range from 20/40 to count-fingers depending on the extent of foveal involvement. Headache and other neurological symptoms, such as sensorineural hearing loss , may be noted and may appear months after the ocular involvement. All patients with a new diagnosis of APMPPE should receive a full neurologic and systemic work-up to evaluate for CNS vasculitis and other associated systemic conditions. APMPPE-associated cerebral vasculitis can be fatal. Other associated CNS disorders that are sometimes associated with APMPPE include optic neuritis, peripheral vestibular disorders, meningoencephalitis, seizures, venous sinus thrombosis, intracerebral hemorrhage, and CVA/TIA .
Anterior segment exam is usually normal, though anterior uveitis can be present. There may be mild vitritis present in 50% of cases. Fundoscopic examination typically shows multiple bilateral creamy yellow-white placoid lesions at the level of RPE and choroid 1-2 disc diameters throughout the fundus, posterior to the equator (generally within the posterior pole). The lesions gradually fade over the course of 1-2 weeks. New lesions may appear in the periphery up to 3 weeks following onset (radially or linearly). Papillitis may occur, but cystoid macular edema is uncommon.
Older lesions are replaced with RPE atrophy or hyperpigmentation . There are reports of associated retinal vasculitis, vein occlusion, subhyaloid hemorrhage, retinal neovascularization, exudative retinal detachment, and rare choroidal neovascular membrane formation.
No specific laboratory tests exist to confirm the diagnosis. Fluorescein angiography and Indocyanine Green angiography are typically performed. Optical coherence tomography, fundus autofluorescence and spectral domain optical coherence tomography angiography may also have a role in diagnosis . Characteristic findings of these diagnostic procedures include:
- Fluorescein Angiogram (FA): Active lesions exhibit early hypofluorescence (blockage) corresponding to the placoid lesions followed by late, irregular hyperfluorecent staining . Early hypofluorescence may represent poor perfusion of the choriocapillaris or signal attenuation from overlying outer retina and/or RPE thickening. Late hyperfluorescence may be a result of vascular leakage, which resolves in subacute or healed lesions .
- Indocyanine Green (ICG) Angiogram: Active placoid lesions manifest as early and late hypofluorescence, which is thought to occur due to poor perfusion of the choriocapillaris. Normalization of the ICG signal may occur as the lesions resolve .
- Fundus autofluorescence (FAF): Placoid lesions generally appear hypoautofluorescent and may have edges that are hyperoautofluorescent. Hypoautofluorescence may persist at borders after lesion resolution .
- Optical coherence tomography (OCT): Hyperreflectivity from the outer plexiform layer to the RPE with normal retinal thickness occurs in acute lesions . Absence of the ellipsoid zone (EZ) may also indicate foveal involvement and correlate with the loss of visual acuity . Hyperreflectivity of outer layers disappears, the EZ re-emerges, and focal photoreceptor/RPE atrophy occurs during resolution of the placoid lesions .
- Spectral domain and optical coherence tomography angiography (SD-OCTA): May reveal abnormalities in choriocapillaris flow. Loss of flow can be seen in acute lesions, while vascular channels form in healing lesions with some return of flow. The cause of this finding in acute lesions may be due to signal attenuation from outer retina and/or RPE thickening or due to decreased perfusion through the choriocapillaris .
Additionally, CNS imaging should be performed to rule out CNS vasculitis in all patients with a new diagnosis of APMPPE.
A case with imaging has been presented at https://www.aao.org/eyenet/article/the-case-of-aches-and-pains-and-blurry-vision
Other White-Dot syndromes can resemble APMPPE. In particular, APMPPE, relentless placoid choroiditis, and serpiginous choroiditis are all characterized by creamy yellow-white placoid lesions with similar imaging and angiographic characteristics . These include, but are not limited to:
- Relentless placoid choroiditis: a diagnosis of RPC should be considered with persistent APMPPE that extends beyond 6 months. Placoid lesions in RPC are generally more numerous and peripheral, even anterior to the equator, when compared with APMPPE .
- Serpiginous chorioretinitis: The clinical course of SC is generally more chronic and severe than APMPPE. Placoid lesions in SC typically appear in the peripapillary region or macula and spread centrifugally in a serpiginous fashion and new lesions erupt from the edges of old lesions. A serpiginous-like chorioretinitis can be caused by syphilis or tuberculosis .
- Multiple evanescent white dot syndrome - unilateral, smaller lesions, disc edema present, foveal granularity
- Multifocal choroiditis and panuveitis
- Punctate inner choroidopathy
- Birdshot chorioretinopathy
Other infectious uveitis (tuberculosis, fungal disease, syphilis), choroidal metastases, and lymphoma may present with placoid lesions as well and should be ruled out with appropriate tests if clinical suspicion high.
Prognosis and General Management
APMPEE is self-limiting with a generally good prognosis with the majority of affected patients achieving a visual acuity of 20/40 or better. Visual recovery typically takes 4 weeks, but can extend to 6 months in some patients. A recent review by Fiore T el al. analyzed 183 articles related to APMPPE and concluded that 25% of patients had a visual acuity of 20/50 or worse. Importantly, foveal involvement confers a worse visual prognosis . Other atypical features, including age older than 60 years, unilaterality, an interval before involvement of the second eye of at least 6 months, recurrence of the disease, and leakage from choroidal veins, may also portend a poorer prognosis . There is no current consensus on treatment to stymie loss of visual acuity in APMPPE. However, steroids have been utilized and reported to be beneficial in cases of foveal involvement and associated CNS vasculitis ; some physicians opt for steroids even in the absence of these two features. Future studies are needed to evaluate dosage, duration, and effects of steroid treatment. All patients with a new diagnosis of APMPPE should receive a full neurologic and systemic work-up to evaluate for CNS vasculitis and other associated systemic conditions, particularly autoimmune and infectious diseases outlined in the Risk Factors section.
Recurrent or chronic APMPPE may represent relentless placoid chorioretinitis, also known as ampiginous choroiditis, a disease that shares characteristics with APMPPE and serpiginous chorioretinopathy. It has high recurrence rate, longer period of disease activity, and numerous multifocal lesions (>50) scattered throughout the fundus . Correct diagnosis here is important, as the relapses of RPC and SC may need control with immunomodulatory therapy .
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