可分为先天性和后天性原因所引起，它可发生在身体任何部位，但以四肢较为常见。
Can be divided into congenital and tile causes, it can occur in any part of the body, but with limbs are common.
扁平足：先天性或后天性足纵弓平坦的一种外科病。足和足跟向外侧旋转，足弓消失，形成八字脚。
Flatfoot: Congenital or acquired flatness of the arch of the foot, in which the foot and heel usually also roll outward, resulting in a splayfooted position.
肾囊肿的发生原因尚不完全清楚，可能与先天性肾小球、肾小管结构异常和后天性损伤感染有关。
The reasons of Renal Cyst occur still unconfirmed, may occur from congenital glomerular, renal tubular structure anomalies and postnatal damage infection.
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