患儿　男 ,6个月。因左下肢部分缺如就诊。临床检查 :患儿左小腿缺如 ,左足与大腿直接相连 ,呈外翻形 ,如海豹肢 (图 1)。余肢体发育正常 ,其父母否认怀孕期间有服图 1　X线片显示左小腿缺如 ,左足直接与大腿相连 ,并呈外翻畸形 ,如海豹肢　图 2　左胫腓骨及膝关节缺如 ,左足与 Children male, 6 months. Due to lack of left lower extremity treatment. Clinical examination: children with left lower extremity, left foot and thigh directly connected, was inverted shape, such as seal limbs (Figure 1). The remaining limbs were normal development, the parents denied pregnancy during service Figure 1 X-ray showed the absence of left leg, left foot directly connected to the thigh and was valgus deformity, such as seal limbs Figure 2 Left tibia fibula and knee joint absence, left foot versus