The Image Analysis of Some Non-tumor Factors Affecting Mediastinal Lymph Node Size
|Course||Medical Imaging and Nuclear Medicine|
|Keywords||mediastinal lymphadenopathy computed tomography|
The image analysis of some non-tumor factors affecting mediastinal lymph node size Purpose: To enhance the ability to differential diagnose mediastinal lymphadenopathy. Method: 365 patients who received chest CT scan are divided into 4 groups according to image and clinic performance.1.Neither image nor clinic evidence suggest malignant disorder.2.Remote lesion in lung or evidence of previous tuberculosis infection exists.3.Image or clinic performance of pulmonary emphysema.4.Congestive heart failure. The short axial, location and number of all cases′ mediastinal lymph nodes were measured separately. Results: 1.The average short axial of mediastinal lymph node in the group under 50 is 4.9±1.3；and that in the group over 50 is 6.2±1.5,the difference is significant at 0.05 level. The difference of prevalence of lymphadenopathy larger than 10mm between age group under and beyond 50 is significant,which is 0% and 7.1% respectively. 2.There is no significant difference between male and female in the short axial and the number of mediastinal lymph node detected by CT scan. 3.The size of mediastinal lymph node differ from each other in most regions, and the 4R,5,7,10R regions are larger than that of other regions. Short axial up limits estimated of every<WP=6>regions do not exceed 9 mm. 4.Lymph node enlarges in case of remote tuberculosis lesion,pulmonary emphysema、congestive heart failure; and prevalence of mediastinal lymphadenopathy larger than 10 mm are 8.7%（4/46），24.4%（21/86）and 32.4%（12/37） separately. In the latter two group, prevalence is much higher than that of normal and remote tuberculosis groups. Although the lymph node short axial of remote tuberculosis patients is larger than that of normal group, the prevalence of lymphadenopathy between 10mm and 20mm of the former does not exceed that of normal group(p<0.05). The number of lymphadenopathy detected by CT scan in remote tuberculosis group is bigger than that of other groups. Conclusion: When mediastinal lymphadenopathy between 10mm and 20mm are detected in CT scan, differential diagnosis should include patient(s age,location ,existence of pulmonary emphysema,congestive heart failure; while tuberculosis affects it little.