枢椎齿突基底部骨折，但无移位，环椎亦无移位。枕颌吊带牵引两周后，颈痛减轻，活动范围增加。3周后离床活动，6周后颈痛再次加剧，活动明显受限，并逐渐出现四肢无力与瘫痪，这种迟发性瘫痪的原因，是

A．迟发性血肿压迫

B．椎管内纤维质增生压迫

C．脊髓血运障碍

D．黄韧带增厚

E．环椎迟发性前脱位

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