A 3-year old, indoor-only, male castrated Maine Coon cat is presented to you for acute-onset of hindlimb pain and paresis. Physical examination reveals a grade III left parasternal heart murmur and minimal movement in the hind legs. Femoral pulses are bilaterally absent, and the hindlimb toes are cold to the touch. The cat is tachypenic, but lung sounds are normal. What is the most likely diagnosis? 一只3岁的室内雄性已绝育缅因猫由于急性发作的后肢疼痛和轻瘫前来就诊。体格检查提示左侧胸骨旁3级心杂音以及后肢运动功能大幅下降。双侧股动脉缺失，后肢脚趾冰凉。这只猫呼吸急促但肺音听诊正常。最可能的诊断是什么？
A Tetanus 破伤风
B Lymphoma of the spinal cord 脊髓淋巴瘤
C Chlorpyrifos toxicity 毒死蜱中毒
D T3-L3 intervertebral disc disease T3-L3椎间盘疾病
E Thrombus at the aortic bifurcation (saddle thrombus) 主动脉分叉处血栓