[Pulmonary mucosal associated lymphoid tissue( MALT) lymphoma with 7-year natural history; computed tomography( CT) scan findings and pathological correlations].

A 58-year-old man was found to have an abnormal shadow on chest computed tomography (CT). The size and density of the nodule increased gradually over 7 years. Partial lung resection was performed by a thoracoscopic procedure. The pathological examination and gene analysis revealed that the tumor was primary pulmonary B-cell lymphoma of mucosa associated lymphoid tissue (MALT lymphoma). The CT findings showed that the level of substantial shadow with air bronchograms gradually increased in the center of the mass shadow, while a radial filamentous and ground glass shadow increased in the periphery. The pathological findings showed a cellular lymphocytic infiltrate that had expanded without destroying the existing blood vessels and bronchi in the center area of the tumor, while had expanded in the interstitial area along with vessel bundles in the border area. The CT findings were consistent with the pathological findings.