Figure 1From: Asymptomatic tracheal MALT lymphoma discovered on spirometric findings presenting with elevated respiratory resistanceTime-course of the flow–volume curve suggesting long-term intrathoracic CAO. a Decreased peak expiratory flow rate 3 years before the diagnosis. b A plateau in FEF accompanied by relatively preserved FIF at presentation. c Improvements observed during radiation therapy at doses of 24 Gy. d Improvements observed after radiation therapy (36 Gy).Back to article page