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The degree of pulmonary arterial involvement varies. Here, we compare two PVOD patients who were transplanted at 8 years of age, whereof one is a homozygous <jats:italic>EIF2AK4<\/jats:italic> mutation carrier. Tissue was imaged with synchrotron\u2010based micro\u2010CT and the results were compared with clinical data and sectioned tissue was analyzed with histology, immunohistochemistry, immunofluorescence, and in situ hybridization. Chest CT of the noncarrier exhibited scattered poorly defined ground\u2010glass opacities and marked septal lines, whereas the mutation carrier showed numerous nodular centrilobular ground\u2010glass opacities and sparse septal lines. The noncarrier developed pulmonary edema with vasodilators and 3D imaging combined with histology showed severe obstruction of interlobular septal veins and medial hypertrophy of pulmonary arteries, but no arterial or arteriolar intimal fibrosis. In contrast, the mutation carrier exhibited only mild intimal fibrosis in interlobular septal veins but severe arterial and arteriolar remodeling, including intimal fibrosis, tortuous course of arterioles, muscularization extending to the alveolar duct level and multiple vascular lumens within the same pulmonary arterial adventitia. Both patients had focally thickened alveolar septa with areas of pulmonary capillary hemangiomatosis (PCH) which colocalized with increased capillary muscularization, tenascin C expression, and deposition, as well as with matrix metalloproteinase\u20109 (MMP9)\/CD45 positive cells. In conclusion, synchrotron\u2010based phase\u2010contrast micro\u2010CT is valuable for understanding vascular remodeling. Significant differences were observed between heritable and sporadic PVOD, which may influence management strategies.<\/jats:p>","DOI":"10.1002\/pul2.70024","type":"journal-article","created":{"date-parts":[[2024,12,13]],"date-time":"2024-12-13T04:41:03Z","timestamp":1734064863000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Synchrotron\u2010Based Phase\u2010Contrast Micro\u2010CT Combined With Histology to Decipher Differences Between Hereditary and Sporadic Pediatric Pulmonary Veno\u2010Occlusive Disease"],"prefix":"10.1002","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5947-4759","authenticated-orcid":false,"given":"Ida","family":"Jeremiasen","sequence":"first","affiliation":[{"name":"Department of Experimental Medical Science and Wallenberg Center for Molecular Medicine Lund University Lund Sweden"},{"name":"The Pediatric Heart Center Sk\u00e5ne University Hospital Lund 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