Intra-abdominal follicular lymphoma masquerading as severe cardiopulmonary disease in a Vietnam War veteran exposed to agent orange

A 68-year-old Hispanic male US Army veteran with a medical history of chronic obstructive lung disease, undefined lung scarring, heart failure with preserved ejection fraction, obstructive sleep apnoea, obesity hypoventilation syndrome [on oxygen by nasal cannula 2–4 L, bilevel positive airway