We present thirteen examples of pulmonary pneumocystis (PCP) in patients without HIV infection. Eight men and five women, average age 55, with one instance of breast neoplasia, two cases of DICV, one case of "Goodpasture's syndrome," one case of idiopathic fibrosing PINS treated with extended corticotherapy for two years, and the other patient without known immunosuppression. In 11 cases, there is persistent dyspnea and severe hypoxia. Lymphopenia (9 instances), with a 920.76 element/mm3 average rate. Except in two cases where examination of the bronchoalveolar lavage fluid was required, the diagnosis was established by the isolation of Pneumocystis jiroveci in the induced sputum. The evolution was positive in every case while receiving trimethoprine-sulfametaxazole and corticosteroid therapy.