Abnormal larynx morphology Subglottic laryngitis 2020-05-14T08:07:32Z Spasmodic croup Narrowing of the larynx, commonly occurring during viral respiratory tract infections, in particular in children, leads to symptoms such as hoarseness, a barking cough, stridor, and sometimes dyspnea and respiratory failure. Laryngitis Croup Viral croup Pseudocroup