D2I2.
genetic

Klippel–Trénaunay syndrome

Klippel–Trénaunay , formerly Klippel–Trénaunay–Weber syndrome and sometimes angioosteohypertrophy syndrome and hemangiectatic hypertrophy, is a rare medical condition in which blood and/or lymph vessels fail to form properly. The three main features are nevus flammeus, and malformations, and soft- hypertrophy of the affected limb. It is similar to, though distinct from, the less common Parkes Weber syndrome.

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Plain-language summary adapted from Wikipedia. Not medical advice.