What is lymphoid interstitial pneumonitis in HIV?

Infiltrate of interstitium and alveolar spaces of lymphocytes. 25-40% of children with perinatal HIV, second/third year of life Less common in adults (with ART) Dx: biopsy, usually benign, B cell polyclonal Pt approach acc to severity, either ART (symptomatic), glucocorticoids may be effective as well