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Three abnormal shadows were detected in the right lung on chest X-ray films and computed tomography in a 75-year-old woman during follow-up for idiopathic thrombocytopenic purpura. Because a definitive diagnosis was not obtained through general examinations, exploratory thoracotomy was performed for diagnosis and treatment. The main lesion in the right middle lobe was diagnosed as mucosa-associated lymphoid tissue (MALT) lymphoma according to histopathological findings, cytogenic studies and reverse transcriptase-polymerase chain reaction analysis, and nodular lesions in S(3) and S(7) were diagnosed with Congo-red staining as local deposition of amyloid. The patient had no recurrence of the MALT lymphoma of the lung or other organs for 4 years after surgery. To our knowledge, this is the first reported case of primary pulmonary MALT lymphoma combined with idiopathic thrombocytopenic purpura/lung amyloidoma.

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