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Angiodysplasia is the most common vascular lesion of the gastrointestinal tract, and this condition may be asymptomatic, or it may cause gastrointestinal (GI) bleeding.
Optic nerve hypoplasia. Optic Nerve Hypoplasia (ONH) is the most commonly. found optic nerve head anomaly.3 It is a congenital, non-pro-. gressive, developmental anomaly characterized by the tetrad. of: small optic disc, peripapillary ââdouble-ring signââ, thinning. of the nerve fibre layer and vascular tortuosity. Patients with.