Progressive bifocal chorioretinal atrophy

What it is

A rare genetic isolated chorioretinal dystrophy characterized by distinctive slowly progressing chorioretinal atrophic lesions inducing significant visual impairment. There are three clinical stages. Atrophic macular lesion and nasal subretinal deposits are evident soon after birth (stage 1), the macular lesions progress beyond the retinal vascular arcades, and the foci of nasal atrophy coalesce into a confluent white lesion (stage 2), and marked expansion of both the macular and the nasal atrophic lesions toward the optic disc is observed (stage 3). Patients may also present with photophobia, nystagmus and myopia.

Key facts

Prevalence

<1 / 1 000 000

Age of onset

Infancy, Neonatal

Inheritance

Autosomal dominant

Classified as

Disease

Prevalence figures describe populations, not individuals, and are often estimates from a single study. Where the figure is an incidence or a birth prevalence, it says so.

Signs and symptoms

These ranges are how often a sign appears across everyone diagnosed, not a prediction for one person — most people have some of these and not others. Orphanet also records findings that are specifically absent in this disease; those are in the data but not listed here.

Gene

ICD-10 codes

ICD-10 has no distinct code for most rare diseases, so many are filed under the nearest available one. A shared code identifies the group, not this disease — the ORPHAcode above is what identifies it.

Related health topics

Reached through the ICD-10 categories this disease is filed under, so these describe the broader group rather than this disease specifically.

Cross-references