Lymphocytic interstitial pneumonitis
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Fever in HIV patient.
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Pulmonary trunk is dilated (35 mm) and so are main pulmonary arteries.
Enlarged left supraclavicular lymph nodes.
Pronounced mediastinal lymphadenopathy and mild bilateral hilar lymphadenopathy, more prominent on the left.
Numerous thin-walled air-filled cysts scattered throughout the lungs, ranging from several mm to approximately 2 cm in size.
Subsegmental bibasal atelectasis.
Given a history of HIV and the appearance of pulmonary cysts of varying sizes, the most probable diagnosis is lymphocytic interstitial pneumonitis (LIP).