Question 3087
{"accessible":false,"alternatives":[{"id":14985,"text":"hypersensitivity pneumonitis"},{"id":14983,"text":"superimposed acute pulmonary edema"},{"id":14986,"text":"superimposed atypical infection"},{"id":14984,"text":"underlying connective tissue disease"}],"archived":false,"correctAlternativeId":14985,"explanation":"\u003cp\u003eThe three-density pattern, in the setting of pulmonary fibrosis, is highly suggestive of hypersensitivity pneumonitis.\u0026nbsp; The specificity of this finding in nonfibrotic disease is much lower and holds less significance clinically.\u003c/p\u003e","id":3087,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/3087","nextQuestionPath":"/articles/pulmonary-oedema/questions/2198","relatedArticles":[{"id":17181,"title":"Hypersensitivity pneumonitis","link":"/articles/hypersensitivity-pneumonitis?lang=us"},{"id":27535,"title":"Atypical pneumonia","link":"/articles/atypical-pneumonia?lang=us"},{"id":98325,"title":"Fibrotic hypersensitivity pneumonitis","link":"/articles/fibrotic-hypersensitivity-pneumonitis?lang=us"},{"id":179715,"title":"Connective tissue disease-related interstitial lung disease (CTD-ILD)","link":"/articles/connective-tissue-disease-related-interstitial-lung-disease-ctd-ild?lang=us"}],"alsoUsedIn":[],"stem":"\u003cp\u003eA patient with a history of lung reticulation and traction bronchiectasis on CT and crackles on auscultation presents for HRCT. What does the \"three-density pattern\" on imaging indicate in this setting?\u003c/p\u003e","menuLinks":[{"text":"Report problem with question","url":"https://docs.google.com/forms/d/e/1FAIpQLSfO3soWYhOjJ7yErSysyCe5V4A1CqW7WK3rDA7MtAkecMGqNw/viewform?entry.1624461248\u0026entry.553583435=https://radiopaedia.org/questions/3087"}],"attemptsPercentages":[{"alternativeId":"14985","percentage":75},{"alternativeId":"14983","percentage":13},{"alternativeId":"14986","percentage":13},{"alternativeId":"14984","percentage":0}],"promptToLogin":false,"questionManager":false,"articleId":"pulmonary-edema"}