title: Organizing pneumonia associated with myeloperoxidase anti-neutrophil cytoplasmic antibody.
abstract: Organizing pneumonia (OP) is a clinicopathological entity that occurs idiopathically or in association with several conditions, but there are few reports about myeloperoxidase anti-neutrophil cytoplasmic antibody (MPO-ANCA)-associated OP. We describe a patient with OP whose clinical conditions improved spontaneously. Moreover, serum MPO-ANCA titers paralleled the clinical activity of the disease, which disappeared in association with disease quiescence. Based on these findings, a subset of patients may have OP related to MPO-ANCA. ANCA testing should be considered in the work-up of patients with suspected OP.
authors.affiliation: Department of Respiratory Medicine Iwata City Hospital Iwata Japan.
authors.forename: Shiro
authors.initials: S
authors.lastname: Imokawa
authors.affiliation: Department of Respiratory Medicine Iwata City Hospital Iwata Japan.
authors.forename: Masahiro
authors.initials: M
authors.lastname: Uehara
authors.affiliation: Department of Respiratory Medicine Iwata City Hospital Iwata Japan.
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Uto
authors.affiliation: Department of Respiratory Medicine Iwata City Hospital Iwata Japan.
authors.forename: Jun
authors.initials: J
authors.lastname: Sato
authors.affiliation: Second Division Department of Internal Medicine Hamamatsu University School of Medicine Hamamatsu Japan.
authors.forename: Takafumi
authors.initials: T
authors.lastname: Suda
keywords: Microscopic polyangiitis; myeloperoxidase anti‐neutrophil cytoplasmic antibody (MPO‐ANCA); organizing pneumonia