RESUMEN
Majority of life threatening illnesses in AIDS begin as pulmonary infections and a radiologist must always seriously consider the possibility of HlVinfection and its manifestion when confronting an abnormal chest study in a young adult. Chest radiography may be normal in upto 15 percent of patients with proven pulmonary involvement or the radiographic picture may be confusing due to atypical appearances of opportunistic infections in immuno-compromised host, compounded further by concomitant appearance of neoplastic complications like Kaposi sarcoma or AIDS related Iymphoma. Cases with normal chest radiograph but high degree of suspicion of chest disease need to be evaluated by CT scan which has been found to be superior to chest radiography in identifying patient with and without chest disease and in the differential diagnosis of pulmonary complications in patients with AIDS. Radionuclear scans and MRI have some role only in selected few cases. Combining imaging features with clinical presentation, CD4 lymphocyte count, previous treatment and underlying risk group can narrow down differential diagnosis, expedite treatment and may be helpful in preventing complications