摘要：

Background. Although mucosa-associated lymphoid tissue (MALT) lymphoma has recently been understood to occur in various organs, reports on its development in the thymus are limited. Case. A 59-year-old man had an abnormal shadow with a maximum dimension of 7.5 cm in the anterior mediastinum, pointed out on a computed tomography (CT) scan. It was well-defined with a homogeneous density, suggesting thymoma, and the patient underwent total thymectomy. The pathological diagnosis was MALT lymphoma of the thymus associated with thymic cyst showing proliferation of centrocyte-like tumor cells (CCL) which were positive on immunohistochemical staining for anti-CD20 and bcl-2 antibodies and λ-type monoclonality of the immunoglobulin light chain. Conclusion. MALT lymphoma is a candidate in the differential diagnosis and treatment of anterior mediastinal lesions.

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