abnormal respiratory epithelium morphology respiratory epithelium hypertrophy 2011-03-18T11:35:17Z MP:0010944 MPheno.ontology csmith hypertrophic airway epithelium increase in the bulk size of the pseudostratified ciliated epithelium that lines much of the conducting portion of the airway, including part of the nasal cavity and larynx, the trachea, and bronchi; may be due to cell enlargement or excessive production/accumulation of mucus material