An unusual cause of nonresolving pneumonia.

Non-resolving pneumonia is a challenging clinical problem, with etiological, patient-related, and treatment-related factors to be considered during evaluation. When adequate treatment has been administered, other unusual causes of non-resolving pneumonia need to be considered (Table 1). Primary pulmonary lymphomas are very rare and represent only 3–4% of extra-nodal non-Hodgkin’s lymphoma and only 0.5–1% of primary pulmonary malignancies. Herein we report a patient with persistent cough and bilateral consolidation despite appropriate antibiotic therapy, who was diagnosed with primary pulmonary lymphoma, to illustrate the evaluation of this common and challenging clinical scenario.