Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Swyer-James syndrome ?
    ### Response:
    Swyer-James syndrome is a rare condition in which the lung (or portion of the lung) does not grow normally and is slightly smaller than the opposite lung, usually following bronchiolitis in childhood. It is typically diagnosed after a chest X-ray or CT scan which shows unilateral pulmonary hyperlucency (one lung appearing less dense) and diminished pulmonary arteries.
    