FIGURE. 1 Clinical manifestations and related examination of Patient 1. A. Scattered rash after CAR-T treatment. B. Recurrent oral ulcer. C. Chest CT showed local emphysema and local bronchiectasis. D. Fishbone-like changes were seen in bronchial mucosa, and bronchiectasis was considered; E-1 (×40) E-2 (×100). Only vascular tissue was found in the suspected small airway structure, which was considered to be accompanied by bronchioles, with slight hyperplasia and degeneration of fibrous tissue.