Fig. 1

The surfaces of both lungs were dark red with significant congestion and a large amount of foamy hemorrhagic edematous fluid (A). HE staining showed significant congestion, diffuse pulmonary edema and local hemorrhage in the bilateral pulmonary stroma (B, HE×50). Giemsa staining showed orange-red larynx and hilar mastocytes and the degranulation of some mastocytes in the larynx and hilar (C-D, Giemisa×100)