A case report of unusual cavity presentation of pulmonary extranodal marginal zone B-cell lymphoma of mucosa-associated lymphoid tissue.

Rationale: The common CT scan findings of pulmonary MZBL of MALT type include airspace consolidation, nodules and ground-glass opacity. But, to our knowledge, the present case is the first report of a cavity presentation of pulmonary MZBL of MALT type. Patient concerns: The patient gives his consent and authorizes the photographs featuring his likeness to be published. Diagnoses: This patient was diagnosed as pulmonary MZBL of MALT type by pathology, immunohistochemistry, and gene rearrangement. Interventions: The patient was treated with CHOP (cyclophosphamide, adriamycin, vincristine and prednisone) chemotherapy for twice and antibiotics. Outcomes: He is being followed up for one year, with slight progress in pulmonary MZBL of MALT. Lessons: This case highlights the need to be suspicious of MZBL of MALT type, when a radiographic image shows cavity lesion. We should consider whether the diagnosis is correct, when the patient's treatment is not effective.