- Etiology: lymphoproliferative response to HIV / EBV
- CXR: diffuse, symmetrical, reticulonodular or nodular infiltrate with or without hilar + mediastinal adenopathy, nodules are 2-3 mm in size at bases + periphery
- Complications: bronchiectasis, cysts, bacterial superinfection
- Clinical: Steroid responsive, in perinatally infected HIV babies 30-40% get LIP
