A 35 year old HIV infected man lives along MIssissippi river and develosp fever, chest pain and dry cough CXR shows opacities consisten with calcified masses. Results of PPD skin test are negative. 1. What is likely diagnosis? 2. What would a CT guided biopsy of one of the masses show?

The main function of the respiratory system is gas exchange (O2 and CO2). Ventilation is the movement of air through the respiratory tract into (inspiration) and out of (expiration) the respiratory zone (lungs).