CASE REPORTS
JOURNAL ARTICLE
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Clinical features of secondary pulmonary alveolar proteinosis associated with myelodysplastic syndrome: Two case reports.

Medicine (Baltimore) 2017 November
RATIONALE: Pulmonary alveolar proteinosis (PAP) is a rare lung disorder characterized by the abnormal accumulation of alveolar surfactant protein in alveolar spaces. Secondary PAP can result from myelodysplastic syndrome (MDS).

PATIENT CONCERNS: But most reports described a single case; here we reported 2 cases of PAP secondary to MDS. One case developed secondary PAP at the same time as MDS, and the other developed during the course of MDS.

DIAGNOSES: The diagnosis of PAP was made by bronchoalveolar lavage and based on the identification of periodic acid-Schiff-positive proteinaceous material. Chest high resolution CT (HRCT) scans showed variable distribution of ground glass opacities, but crazy-paving appearance was not seen in our 2 cases.

INTERVENTIONS: Because the patients' general conditions were poor, whole lung lavage was not used in the 2 cases.

OUTCOMES: And the 2 cases' prognoses were poor.

LESSONS: In conclusion, pulmonary physicians should suspect the possibility of secondary PAP when they encounter unexplained pulmonary infiltrates with some hematologic or infectious disease that shows diffuse bilateral GGO on an HRCT scan.

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