Diagnostic role of magnetic resonance angiography in Swyer James syndrome: Case series of two cases.

Swyer James syndrome is a rare syndrome which occurs due to viral illness in early childhood. The post infective obliterative bronchiolitis results in arrest of lung growth and alveolarization with reduced vascularity resulting in classical radiological features. We describe two cases of patients fulfilling all the criteria of the syndrome - 1) Unilateral hyperlucent small lung in chest radiograph with air trapping on expiration, small ipsilateral hila and pulmonary artery. 2) Diffuse decrease in attenuation of lung parenchyma with bronchiectasis and reduction in vascularity. 3) Unilateral pruned tree appearance on angiography (MRA). The clinical presentation was recurrent chest infection in a child and infrequent bouts of hemoptysis in a middle aged female. The study demonstrates the role of magnetic resonance angiography in diagnosing the condition.