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pneumocystosis pneu·mo·cys·to·sis (nōō'mō-sĭ-stō'sĭs, nyōō'-)
Pneumonia that results from infection with Pneumocystis carinii, occurs frequently among immunologically compromised individuals, and is characterized by alveoli filled with a network of acidophilic material that enmeshes the organisms. Also called interstitial plasma cell pneumonia.