Teaching points• Osseous involvement in children with LCH is very similar to that seen in multiple myeloma.• A solitary lytic lesion of the cranial vault is a typical radiographic finding of LCH.• A vertebra plana appearance in the spine is another typical radiographic finding.• Extensive signal intensity changes within bone marrow on MRI are a helpful sign for the diagnosis.• In long bones, endosteal scalloping may be responsible for a “budding appearance”.
• Depiction of chronic pulmonary embolism exclusively located on peripheral arteries is difficult. • The main differential diagnosis of pCTEPH is PAH. • The pattern of DECT perfusion changes can help differentiate PAH and pCETPH. • In PAH, almost all segments with abnormal perfusion showed patchy defects. • In pCTEPH, patchy and PE-type defects were the most frequent abnormalities.
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