[Diffuse lung lesions and multiple enlarged lymph nodes: a case report].

This article reported a case of an elderly female patient with diffuse lung lesions and multiple enlarged lymph nodes. In the early stages of diagnosis, many clues, obtained through cellular immunology and molecular biology tests on a variety of samples including blood and bronchoalveolar lavage fluid, pointed to the diagnosis of tuberculosis. At the same time, a peripheral lymph node biopsy was conducted, which led to the diagnosis of lymphoma coexisting with tuberculosis, a"dual-diagnosis". In the subsequent treatment, lymphoma therapy was actively pursued while the patient's tuberculosis infection was treated, with good results observed in the follow-up treatments. When diagnosing the disease, the differential diagnosis must be integrated into the overall disease process, and avoiding rigid adherence to a "unitary"diagnostic concept.