대한흉부영상의학회 Weekly Chest Cases

Diagnosis: Marginal zone B-cell lymphoma of MALT
Radiologic Findings: Fig 1. Chest radiography shows diffuse innumerable micronodules in both lungs.
Fig 2-3. Innumerable micronodules show a distribution along the bronchovascular bundles in both lungs.
Fig 4. There are no enlarged lymph nodes in mediastinum and no pleural effusion.
Fig 5. These lesions show increased FDG uptake on PET-CT.
Brief Review: Pulmonary mucosa-associated lymphoid tissue (MALT) lymphoma is a low-grade marginal zone B-cell lymphoma arising from bronchus-associated lymphoid tissue (BALT).
On imaging, it commonly presents as nodules, masses, or areas of consolidation, often showing a bronchovascular distribution with air bronchograms on CT. Additional findings may include ground-glass opacity, halo sign, and peribronchovascular thickening. On PET/CT, FDG uptake is variable, with about half of cases showing hypermetabolic activity.
References: 1. Sirajuddin A, Raparia K, Lewis VA et al. Primary pulmonary lymphoid lesions: Radiologic pathologic findings. Radiographics. 2016 Jan-Feb;36(1):53-70.
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대한흉부영상의학회 Korean Society of Thoracic Radiology