Shimaya M, Inagaki Y, Arai T, Kawakami M, Takeuchi N, Sumikawa H, Shimizu S, Takimoto T, Inoue Y. Autoimmune Pulmonary Alveolar Proteinosis Complicated by Myelodysplastic Syndrome.
Intern Med 2024;
63:1451-1457. [PMID:
37839886 PMCID:
PMC11157314 DOI:
10.2169/internalmedicine.1982-23]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Accepted: 09/01/2023] [Indexed: 10/17/2023] Open
Abstract
Pulmonary alveolar proteinosis (PAP) is characterized by an abnormal surfactant accumulation in peripheral air spaces. Autoimmune PAP (APAP) results from macrophage dysfunction caused by anti-granulocyte-macrophage colony-stimulating factor (GM-CSF) autoantibodies, and the presence of antibodies more than the cutoff value is specific for APAP. In contrast, secondary PAP (SPAP) does not require anti-GM-CSF autoantibodies and is complicated by other diseases, including myelodysplastic syndrome (MDS). A 73-year-old man with anemia and thrombocytopenia was diagnosed with APAP and MDS simultaneously. The measurement of serum anti-GM-CSF autoantibodies is important for the correct diagnosis and management of PAP, even with an established diagnosis of underlying SPAP-suggestive disease.
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