ABSTRACT
Objective To analyze the CT findings of invasive mucinous adenocarcinoma of the lung.Methods The CT findings of 7 patients with invasive mucinous adenocarcinoma of the lung were retrospectively analyzed. Results Six cases manifested isolated pulmonary nodules or masses, among which circular/round shape was in 6 cases,clear tumor-lung parenchyma interface was in 6 cases,lobular sign was in 5 cases,specular sign was in 6 cases,calcifications was in 3 cases,angiogram sign of contrast enhancement was in 4 cases, and the CT value was close to the liquid density in 6 cases. One case showed consolidation of lung with multiple nodules or mass, and the lesions had angiographic signs calcification, unenhanced area with water density as well. The CT findings of angiography signs, calcification and consolidation of regional focal liquid opacity had significance for the diagnosis.One case was misdiagnosed as tuberculosis and 1 case as hamartomas. Factors which caused misdiagnosis were irregularly shaped calcifications and angiographic signs in lesion, and the enhanced CT value was less than 20 HU. Conclusions The invasive mucinous adenocarcinoma of the lung has characteristic CT findings. In addition to the malignant tumor features. When plain CT scan finds the watery density, calcifications and angiographic signs in the lesion, the invasive mucinous adenocarcinoma of the lung should be considered.The enhanced CT scan shows no enhancement or enhanced value less than 20 HU is also the characteristic of invasive mucinous adenocarcinoma of the lung. MRI check will help us to improve the diagnostic accuracy.