<prompt> Lymphocytic interstitial pneumoni s LIPIs uncommon in ver tically acquired HIV infectionIs due to a protozoal infectionIs seen on chest X-ray as a perihilar infiltra on in a butterfly distributi onMay be associated with hepatosplenomegaly  <response>: It is seen most commonly in children who have veically HIV infection. The chest X-ray findings are of a diffuse infiltration and some perihilar lymphadenopathy also. There may be associated hepatomegaly, generalised lymphadenopathy or pancreas. Steroid therapy is only necessary if symptomatic to reduce oxygen requirement and increase exercise tolerance. 