Pneumocystis jirovecii pneumonia: case reportAn 84-year-old man developed Pneumocystis jirovecii pneumonia during treatment with methylprednisolone for symptomatic brain metastases.The man, who was a non-smoker and HIV-negative, was diagnosed with a non-small cell lung carcinoma in August 2015 at the age of 83 years. He went into complete remission after 6 cycles of carboplatin and etoposide with thoracic radiation. In December 2016, a stage I right lower lobe lung adenocarcinoma was discovered, which was treated with lobectomy. In April 2017, a neurological impairment showed a frontal brain metastasis, and he received treatment with radiotherapy associated with methylprednisolone initially at 100 mg/day and then reduced to 50 mg/day [route not stated]. In June 2017, he presented with dry cough and shortness of breath associated with self-reported fever. Two days later, he was admitted to the hospital. On admission, he had fever, with blood pressure 108/61 mm Hg, regular pulse rate 79 bpm, respiration rate 18 cycles/min, and oxygen saturation 95% with 2 L/min of oxygen supplementation. He had no recent chemotherapy, and no immunosuppressive treatment other than methylprednisolone. Blood laboratory tests were as follows: haemoglobin concentration 129 g/L, platelet count 244000 × 10 9 /L, WBC count 6400/mm3 and neutrophil count 3900 /mm 3 with no cytopenia. No renal dysfunction was found as estimated glomerular filtration rate of >60 mL/min. Chest CT scan revealed bilateral excavated nodules evoking lung abscesses, associated with diffuse bilateral ground glass opacities. A bronchoalveolar lavage (BAL) was immediately performed with good tolerance, for bacteriological and mycological analyses. Blood culture and serum galactomannan antigen were found to be negative. BAL results showed the presence of P. jiroveci with Gomori-Grocott staining, indirect immunofluorescence and positive pneumocystis PCR at the 21st cycle of amplification, as well as a few colonies of Aspergillus fumigatus in culture, Actinomyces odontolyticus in culture were found with Nocardia nova susceptible to cotrimoxazole [trimethoprim-sulfamethoxazole]. To explain the acute respiratory failure, the role of A. odontolyticus was discarded, which was found to be a contamination during the BAL procedure. Images of lung abscesses were compatible with N. nova, but nocardiosis not explained the rapid clinical degradation. As he had no neutropenia and a negative A. fumigatus PCR in BAL, made the possibility of rapidly lethal invasive aspergillosis less likely. The association of diffuse bilateral ground-glass opacities, very low cycle threshold value of pneumocystis PCR in BAL, a positive direct examination and a deep hypoxaemia progressing into severe acute respiratory failure, attributed the death of the patient to a Pneumocystis jirovecii pneumonia, rather than other coinfections. A final diagnosis Pneumocystis jirovecii pneumonia secondary to methylprednisolone was made.The man received treatment with ceftriaxone and spiramycin [rovamycin] for communi...