Adenosquamous carcinoma of the lung: radiologic appearance.

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Abstract
To our knowledge, the imaging features of pulmonary adenosquamous carcinoma, a form of bronchogenic carcinoma with a greater propensity for metastases at the time of diagnosis and a poorer prognosis than other forms of bronchogenic carcinoma, have not been reported. Accordingly, we studied the radiologic appearance of this tumor to describe the findings and discern if there are features that distinguish it from other bronchogenic carcinomas.Clinical and radiologic features of 30 cases of adenosquamous carcinoma were reviewed. Chest radiographs were available in all cases and CT scans were available in 23. In cases without CT scans, planar tomograms were reviewed in five cases and MR images were reviewed in one. Tumors were defined by location, morphology, and TNM classification.The tumors measured 0.6-6.5 cm in diameter (mean, 2.8 cm) on CT scans or chest radiographs. One tumor not seen even in retrospect on CT scans or chest radiographs was found at autopsy. Twenty-five tumors were solid and four were ca...

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