Objective To explore the clinical and MSCT manifestations of nontuberculous mycobacteria (NTM) lung diseases.Methods Totally 102 patients with proved NTM lung diseases (NTM group) and 102 patients with pulmonary tuberculosis (TB group) were included in the study.MSCT image and clinical data of patients were retrospectively analyzed.The t/x2 test were used to analyze the differences of clinical and imaging findings between two groups.Results The main clinical symptoms of NTM group were cough,expectoration,hemoptysis and shortness of breath after activity,which had no significant differences between two groups (all P＞ 0.05).NTM lung diseases patients often associated with chronic lung diseases such as pulmonary tuberculosis,chronic obstructive pulmonary disease,pulmonary heart disease.The differences were significant between two groups (all P＜0.05).The main CT manifestations of NTM lung diseases included centrilobular nodules (89/102,87.25％),bronchiectasis (67/102,65.69％) and patchy consolidation (64/102,62.75％).Secondly,fiber cable disease,thin-wall cavities and pleural incrassation were common found.The detection rate of centrilobular nodules,bronchiectasis and thin-wall cavities in NTM group were significantly higher than those in TB group (x2 =3.995,22.675,12.823,respectively,all P＜0.05).Bronchiectasis were often found in the right middle lobe and/or left lingula lobe.Conclusion NTM lung diseases patients often associate with chronic lung disease.The CT manifestations of NTM lung diseases have certain characteristics.Especially when the bronchiectasis occurred in the right middle lobe and/or left lingular lobe and accompany by the centrilobular nodules,thin-wall cavity and antituberculous therapy being invalid,NTM lung diseases should be considered.

Objective To investigate the value of MSCT in assessing bowel ischemia of small-bowel obstruction .Methods CT images and electronic medical records of 40 patients with small-bowel obstruction were retrospectively evaluated.Patients were treated by surgery.The CT signs of bowel ischemia were recorded.Relationship between CT signs and bowel ischemia were tested by Fisher exact andχ2 test.Sensitivity and specificity of MSCT for ischemia were also assessed.Results Bowel ischemia was confirmed at surgery and/or pathological examination in 21 of 40 patients.Diminished enhancement after contrast agent injection was the most common sign in bowel ischemia patients.The signs of increased bowel-wall attenuation on non enhanced images and diminished enhancement after contrast agent injection were significantly associated with ischemia (P <0.000 1).The signs of increased bowel-wall attenuation on non enhanced images and pneumatosis intestinalis had high sensitivity(100%).The sign of diminished enhancement after contrast agent injection had high sensitivity(95.2%)and specificity(94.7%).Conclusion MSCT is accurate in assessing bowel ischemia of small-bowel obstruction, and improves the timeliness and diagnosis for this disease.

Objective To explore the CT characteristics of mycobacteria intracellulare lung disease.Methods CT imaging data of 37 patients with mycobacteria intracellulare lung disease in our hospital were analyzed retrospectively.Results The main CT signs of mycobacteria intracellulare lung disease included centrilobular nodules (97.3%), bronchiectasis (73.0%) and patchy consolidation (54.1%).Fibrous lesion(43.2%), diameter≥1 cm nodules(35.1%)and thin-wall cavity(29.7%) were also common found in patients.Thick-wall cavity and pleural effusion were not common.The typical CT manifestation was bronchiectasis accompany by the centrilobular nodules occurred in the right middle lobe and (or) left lingular lobe.Conclusion CT manifestations of mycobacteria intracellulare lung disease have some characteristics, and CT examination has a certain value in the diagnosis of this disease.

Objective To investigate the MSCT manifestations of hepatic fat-poor perivascular epithelioid cell tumor (PEComa). Methods CT and pathological findings of 8 patients with hepatic fat-poor PEComa confirmed by surgery were assessed retrospectively.Results 8 cases had solitary lesion,all lesions with round or round-like shape.The largest diameter ranged 20-110 mm.The fat density was not measured by CT scan.6 lesions composed of solid component,and solid part showed obviously enhancement on arterial phase.On portal venous phase and parenchymal phase,the tumors showed equal or low or slightly high density.2 lesions showed cystic necrosis,peripheral enhancement on arterial phase,1 lesion showed continuous enhancement and the enhancement degree increased,and another lesion showed reduced enhancement.All lesions had tortuous vascular in the center of lesions or at the peripheral.Immunohistochemistry examinations showed that HMB45,Melan-A and SMA were positive in all cases,CD31,CD34 and S-100 expressed positive in partial cases. Conclusion The CT findings of hepatic fat-poor PEComa are lack of specificity.When the enhancement and clearance pattern of liver mass is similar to hepatocellular carcinoma or adenoma,the clinical history does not support the diagnosis,may consider the possibility of PEComa when tortuous vascular in the center of lesions or at the peripheral on arterial phase.