Large choroidal excavation in pachychoroid disease: A case report.

Large choroidal excavation has been rarely reported. Although the pathogenetic mechanisms leading to the formation of large choroidal excavation are still only hypotheses, a combination of primary degenerative inflammatory factors sustaining the focal choroidal excavation formation and disruptive process of the choroidal neovascularization could be retained responsible for the large choroidal excavation.