In type II, The medial head of the gastroc inserts more lateral than normal and the artery descends in a straighter path around the medial margin of the muscle.
In type III, the artery is compressed by a slip of the medial head arising more laterally than normal, with the artery passing through the body of the medial head in a relatively straight path.
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In type IV, the popliteal passes deep to the popliteus muscle or a band, with or without associated gastroc abnormality. This type reflects persistence of a more primitive embryological vascular pattern of the leg.
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