Primary Mucosa-Associated Lymphoid Tissue Lymphoma of the Lung: A Case Report.

Primary mucosa-associated lymphoid tissue (MALT) lymphoma of the lung, also known as pulmonary extranodal marginal zone B-cell lymphoma, is a rare type of non-Hodgkin lymphoma and signifies an uncommon pulmonary malignancy. Given its infrequency, there is limited documentation on its radiological characteristics. In this study, we present the case of a 64-year-old male patient with a pathologically confirmed diagnosis of primary MALT lymphoma of the lungs, which manifested as persistent bilateral lung consolidation without respiratory symptoms. These findings persisted despite six weeks of pneumonia treatment. The patient underwent sequential diagnostic assessments, including chest radiography, chest CT, endoscopy, colonoscopy, and fluorodeoxyglucose PET/CT. A CT-guided percutaneous core biopsy at the right lung consolidation site confirmed the diagnosis of pulmonary MALT lymphoma. Pulmonary MALT lymphoma, while uncommon and slow-growing, should be considered in patients presenting with persistent lung consolidation after ruling out common causes like infection or inflammation.