An 81-year-old male presented with a background history of progressive shortness of breath for 3 years with recent worsening in the past 6 months. Clinicoradiological investigations were consistent with a nonresolving consolidation involving predominantly right lung. This clinicopathologic conference discusses the differential diagnoses of pneumonia of long-standing duration and their management options.
Keywords: Mucosa-associated lymphoid tissue lymphoma; nonresolving consolidation; pulmonary.