Pterygium
Winglike triangular membrane
Pterygium
A pterygium (pl.: pterygia or pterygiums) is any wing-like triangular membrane occurring in the neck, eyes, knees, elbows, ankles or digits. The term comes from the Greek word pterygion meaning "wing".
Read on Wikipedia · Image Jmvaras José Miguel Varas, MD, CC BY 3.0
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