目的 探讨主动脉夹层(AD)真假 腔的CT征象。方法 收集我院2014年-2017 年24例AD，回顾性分析CT表现，评价及 观察AD真假腔CT征象。结果 蜘蛛网征13 例，均位于假腔；鸟嘴征23例，18例位于 假腔，1例位于真腔，4例真假腔均可见； 腔内血栓19例，18例位于假腔，1例真假 腔均见血栓；83.7%节段假腔大于真腔； 37.5%动脉期真腔强化密度高于假腔、静 脉期假腔高于真腔，62.5%真假腔强化密 度相当；内膜片弯曲方向，56.8%节段弯 向假腔，35.8%平直，4.9%弯向真腔，1段 上半部分弯向真腔、下半部分突向假腔， 1例内膜片呈反“S”形；外壁钙化13例， 真腔外壁钙化6例，假腔外壁钙化4例，真 腔及假腔均钙化3例；内膜片钙化及钙化 弯曲方向，内膜片钙化11例，弯向真腔4 例，弯向假腔1例，平直4例，小点状钙 化2例；环绕征1例。结论 蜘蛛网征为AD 假腔的可靠征象，鸟嘴征、真假腔大于对 比、腔内血栓、真假腔强化密度对比有助 于AD真假腔的鉴别。

Objective To investigate the CT findings of true and false cavities in aortic dissection (AD). Methods 24 cases of AD from 2014 to 2017 in our hospital were collected. The CT findings were retrospectively analyzed, and the true and false lumen manifestations of AD were evaluated and observed. Results The spider web signs 13 cases, all in the false cavity. Twenty-three cases were found in the beak, 18 were in the false cavity, one was in the real cavity, and four were in the true cavity. There were 19 cases of intracavitary thrombosis, 18 of which were in the sham cavity. 83.7 false cavities are larger than the true lumen; The true lumen of the arterial period was higher than that of the false cavity, and the phleural cavity was higher than the true cavity. Diaphragm in the bending direction, a total of 81 lesions, 46 segment to the false lumen, 29 straight section, to the true lumen 4, paragraph 1 in the upper part to the true lumen, the lower part to the false lumen, 1 case of diaphragm inside tends to be the "S" shape change; There were 13 cases of external wall calcification, 6 cases of external wall calcification, 4 cases of pseudocavity wall calcification, and 3 cases of true cavity and false cavity. There were 11 cases of calcification and calcification in the inner diaphragm calcification and calcification. There were 11 cases of calcification in the inner diaphragm, 4 cases were curved to the true cavity, 1 case in the flexural cavity, 4 cases in straight lines, and 2 cases of small point calcification. One case is encircled, the lumen is the true cavity. Concluion Spider webs to AD reliable sign of false lumen, around the sign was around the cavity as the true lumen, beak sign and false cavity is greater than the true lumen, lumen thrombosis, the density of lumen strengthen contrast will aid in the identification of AD true and false lumen.