One or more signs of occult neovascularization usually accompany large serous detachments of the retinal pigment epithelium occurring in patients older than 50 years of age. Evidence is presented that a flattened or notched border of these detachments is a frequently encountered and an important biomicroscopic and fluorescein angiographic sign of hidden choroidal neovascular complex, most of which lies outside the area of the serous detachment of the pigment epithelium. A clinical trial is required to determine the reliability of the various signs of occult neovascularization and the effectiveness of laser photocoagulation in these patients.