{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,29]],"date-time":"2026-04-29T08:44:41Z","timestamp":1777452281512,"version":"3.51.4"},"reference-count":7,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2026,4,22]],"date-time":"2026-04-22T00:00:00Z","timestamp":1776816000000},"content-version":"vor","delay-in-days":21,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,4,1]],"date-time":"2026-04-01T00:00:00Z","timestamp":1775001600000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Respirology Case Reports"],"published-print":{"date-parts":[[2026,4]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>Systemic artery\u2010to\u2010pulmonary artery fistulas (SA\u2010PAFs) are rare vascular anomalies, typically associated with chronic pulmonary or pleural inflammation. SA\u2010PAFs are categorised by their systemic arterial origin, arising either from the bronchial arteries or nonbronchial systemic arteries such as the intercostal arteries. Nonbronchial SA\u2010PAFs are uncommon in patients without a history of thoracic trauma, surgery or infection. We report a 55\u2010year\u2010old man with recurrent haemoptysis caused by right intercostal artery\u2010to\u2010pulmonary artery fistulas, despite having no history of pulmonary or pleural disease. The diagnosis was established by selective angiography, and the lesions were successfully treated with coil embolisation. This case demonstrates that haemoptysis due to nonbronchial SA\u2010PAFs can occur even in the absence of a history of the usual aetiologies and may be misclassified as cryptogenic haemoptysis. Even in patients initially diagnosed with cryptogenic haemoptysis, it is crucial to first perform a detailed vascular evaluation using CT angiography to identify hidden nonbronchial SA\u2010PAFs.<\/jats:p>","DOI":"10.1002\/rcr2.70587","type":"journal-article","created":{"date-parts":[[2026,4,22]],"date-time":"2026-04-22T07:48:31Z","timestamp":1776844111000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Haemoptysis Caused by Right Intercostal Artery\u2010To\u2010Pulmonary Artery Fistulas Mimicking Cryptogenic Haemoptysis"],"prefix":"10.1002","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0009-0000-0813-2575","authenticated-orcid":false,"given":"Kengo","family":"Sato","sequence":"first","affiliation":[{"name":"Center for Pulmonary Circulation and Hemoptysis National Hospital Organization Tokyo Hospital  Kiyose 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Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2935-5553","authenticated-orcid":false,"given":"Keita","family":"Takeda","sequence":"additional","affiliation":[{"name":"Center for Pulmonary Circulation and Hemoptysis National Hospital Organization Tokyo Hospital  Kiyose Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hiroshi","family":"Igei","sequence":"additional","affiliation":[{"name":"Center for Pulmonary Circulation and Hemoptysis National Hospital Organization Tokyo Hospital  Kiyose Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kimihiko","family":"Masuda","sequence":"additional","affiliation":[{"name":"Center for Pulmonary Circulation and Hemoptysis National Hospital Organization Tokyo Hospital  Kiyose Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yoshiteru","family":"Morio","sequence":"additional","affiliation":[{"name":"Center for Pulmonary Circulation 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