RESUMEN
Objective To evaluate the value of multimodal MRI in differential diagnosis of lung squamous cell carcinoma and adenocarcinoma.Methods Routine sequence,diffusion weighted imaging(DWI)and dynamic enhancement images about 1 6 squamous cell carcinoma and 21 adenocarcinoma patients were analyzed retrospectively.Taken a record about the size,edge,internal signal, enhancement types and apparent diffusion coefficient(ADC)values when b=600 s/mm2,and the difference in the degree of pathological differentiation was studied.Results The average diameter of squamous cell carcinoma was (4.17±2.0)cm,while adenocarcinoma was (3.81±1.8)cm,lobulated and spiculation were the most common signs in both of them.Squamous cell carcinoma showed low T1signal in 12 cases(75%),low T2signal in 7 cases(43.7%),adenocarcinoma showed high T1signal in 10 cases(47.6%),high T2 signal in 14 cases(66.7%).Squamous cell carcinoma had lower ADC value than adenocarcinoma(1.27×10-3mm2/s vs 1.38×10-3mm2/s), and well differentiated tumors had higher ADC values than poor ones,it was statistically significant.The most common time-signal intensity curves were type A in squamous cell carcinoma(62.5%)and type B in adenocarcinoma(50%).Conclusion MRI findings of squamous cell carcinoma and adenocarcinoma are associated with the biological characteristics,squamous cell carcinoma has shorter T2signal and adenocarcinoma has shorter T1signal.Squamous cell carcinoma has lower ADC value than adenocarcinoma and is dominated by outflow curve (type A),these features are helpful in subtype and differential diagnosis.