Inclusion Criteria  Diagnosis of PCD as having either (i) biallelic mutations in known PCD genes or (ii) classic transmission electron microscopy structural ciliary defect Informed consent and verbal assent (as appropriate) provided by the participant's parent or legal guardian and the participant Ages 6-18 years and able to perform reproducible spirometry and achieve a breath hold duration sufficient for MRI acquisition  Exclusion Criteria  Any other cardiac or respiratory disease Inability to perform a breath-hold of adequate duration for MRI acquisition Medical instability that would preclude the ability to undergo the required investigations FEV1 % predicted <40% on any PFT within last 2 months at time of consent Use of supplementary oxygen Severe claustrophobia Pregnancy or lactation Presence of metal implants or other MRI contraindications