Unusual radiologic presentations of bronchioloalveolar carcinoma

Bronchioloalveolar carcinoma appears with variable radiologic features. The usual findings include a single nodule, multiple nodules, or areas of consolidation in lung. An air bronchogram in an area of nodular or mass-like density is also a well-known feature. We here report six patients whose disease illustrates interesting or unusual aspects of this neoplasm. The findings include: Minimal radiological signs despite diffuse disease found on CT scan or at surgery (two patients). Thickening of the wall of a preexisting lung cavity: presumed bronchogenic cyst. Expansile lobar consolidation without an air bronchogram simulating pleural disease. An elongated lobulated area of mass-like density resembling mucoid impaction. Homogeneous lobar atelectasis without an air bronchogram. Consideration of these varied features may aid in the radiological diagnosis of bronchioloalveolar carcinoma.