Objective To discuss the value of multi-slice spiral CT angiography (MSCTA)and digital subtraction angiography (DSA)in lower extremity arteriosclerosis obliterans.Methods MSCTA and DSA of lower extremity arteries were performed in 41 patients with lower extremity arteriosclerosis obliterans sequentially.The interval of these two examinations was no more than 2 weeks.DSA served as the reference standard and compared with MSCTA in terms of grading of stenoocclusive lesions,visualization of collaterals in lower extremity arteries.Results No significant differences of grading of stenoocclusive lesions,visualization of col-laterals were observed between MCTA and DSA in lower extremity arteries.Compared with the results of DSA,the sensitivity,spe-cificity,accuracy,positive and negative predictive value of MSCTA in the detection of arterial stenosis (≥ 50%)were 97.2%, 98.2%,93.8%,94.6%,98.2%,respectively.Conclusion MSCTA shows relatively high sensitivity and specificity in the diagnosis of lower extremity arteriosclerosis obliterans,can provide effective guidance of planning treatment in lower extremity arteriosclerosis obliterans.

Objective To investigate CT findings of pedicle torsion of ovarian cyst.Methods CT findings and clinical data of 1 6 cases of ovarian cyst torsion confirmed by pathology were analyzed retrospectively.Results All the 1 6 cases of ovarian cyst torsion were pelvic cystic-solid double mass on CT.Cystic wall demonstrated circumscribed thickening in 1 2 cases and diffused thickening in 4 cases.The solid mass appeared as the oval mass or cord-like structure,with lack of enhancement in 1 6 cases.Conclusion Ovarian cyst torsion has the characteristic CT manifestation of pelvic cystic-solid double mass.The correct diagnosis of ovarian cyst torsion could contribute to reasonable treatment in the early stage of the disease.