We described a 47-year-old man with a noninflammatory bilateral corneal ectasia. Superior thinning was present between 11 and 2 hours, with a localized steep area coincident to the thining. An edge of apparently non-affected cornea was observed adjacent to the limbus. No deposits, stress lines or deep neovascularization was observed. This case does not match classic descriptions such as keratoconus or pelucid marginal degeneration. Differential diagnosis among noninflammatory ectasia are discussed, focusing in the samepathology theory.