Cover letter Pediatric Pulmonology Dear Editor, Enclosed is a manuscript to be considered in Pediatric Pulmonology that does not require an abstract , usually. This letter to the editor entitled “Ventilatory limitations are not associated with dyspnea on exertion or reduced aerobic fitness in pectus excavatum: a critical information that must be highlighted to prevent inappropriate interventions” comments the reports by Hardie and al. which tested the hypothesis that PEX deformities are associated with a pulmonary impairment during exercise and concluded that resting lung volume measurements were associated with the anatomic degree of PEX severity.