{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,9,21]],"date-time":"2025-09-21T17:16:45Z","timestamp":1758475005088,"version":"3.44.0"},"reference-count":5,"publisher":"BMJ","issue":"18","content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["Heart"],"accepted":{"date-parts":[[2017,5,3]]},"published-print":{"date-parts":[[2017,9]]},"abstract":"<jats:sec>\n                  <jats:title>Clinical introduction<\/jats:title>\n                  <jats:p>A 32-year-old man referred to the cardiology clinic for palpitations was found to have paroxysmal supraventricular tachycardia (SVT) on 24-hour Holter monitoring. His\u00a0general and cardiac examinations were unremarkable. A transthoracic echocardiographic study to exclude structural heart disease was performed and showed an abnormal structure in relation to the right ventricular (RV) free wall; however, poor echocardiographic windows precluded proper characterisation. Cardiac MR\u00a0(CMR) was therefore performed. Cine images (figure 1 and online\u00a0supplementary\u00a0videos 1 and 2) demonstrated the abnormal structure. Dynamic pass of contrast (rest perfusion module) showed the sequence of intracavitary enhancement across different cardiac chambers in the horizontal long-axis plane (figure 1 and online\u00a0supplementary\u00a0video 3).<\/jats:p>\n                  <jats:fig id=\"F1\" position=\"float\" orientation=\"portrait\">\n                     <jats:label>Figure 1<\/jats:label>\n                     <jats:caption>\n                        <jats:p>Still frames from balanced steady state free precession images in the horizontal long-axis plane (A,B). Still frames from the dynamic pass of contrast in the horizontal long-axis and the short axis following contrast injection into the right arm (C,D). Images in the horizontal long-axis plane at the basal level using T2-weighted short-tau inversion recovery (E) and half Fourier single-shot turbo spin echo (F).<\/jats:p>\n                     <\/jats:caption>\n                     <jats:graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"heartjnl-2017-311485f1\" position=\"float\" orientation=\"portrait\"\/>\n                  <\/jats:fig>\n                  <jats:supplementary-material id=\"SP1\" position=\"float\" orientation=\"portrait\">\n                     <jats:caption>\n                        <jats:title>Supplementary data<\/jats:title>\n                     <\/jats:caption>\n                     <jats:p>\n                        <jats:inline-supplementary-material xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" id=\"ss1\" xlink:href=\"cine_shax-ed.mp4\" mimetype=\"application\" mime-subtype=\"octet-stream\"\/>\n                     <\/jats:p>\n                  <\/jats:supplementary-material>\n                  <jats:supplementary-material id=\"SP2\" position=\"float\" orientation=\"portrait\">\n                     <jats:caption>\n                        <jats:title>Supplementary data<\/jats:title>\n                     <\/jats:caption>\n                     <jats:p>\n                        <jats:inline-supplementary-material xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" id=\"ss2\" xlink:href=\"contrast.avi\" mimetype=\"video\" mime-subtype=\"x-msvideo\"\/>\n                     <\/jats:p>\n                  <\/jats:supplementary-material>\n                  <jats:supplementary-material id=\"SP3\" position=\"float\" orientation=\"portrait\">\n                     <jats:caption>\n                        <jats:title>Supplementary data<\/jats:title>\n                     <\/jats:caption>\n                     <jats:p>\n                        <jats:inline-supplementary-material xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" id=\"ss3\" xlink:href=\"4_chamber.avi\" mimetype=\"video\" mime-subtype=\"x-msvideo\"\/>\n                     <\/jats:p>\n                  <\/jats:supplementary-material>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Question<\/jats:title>\n                  <jats:p>The abnormal structure is most likely which of the following?<jats:list list-type=\"alpha-upper\">\n                        <jats:list-item>\n                           <jats:p>Pericardial cyst<\/jats:p>\n                        <\/jats:list-item>\n                        <jats:list-item>\n                           <jats:p>Right atrial appendage aneurysm<\/jats:p>\n                        <\/jats:list-item>\n                        <jats:list-item>\n                           <jats:p>Right ventricular aneurysm<\/jats:p>\n                        <\/jats:list-item>\n                        <jats:list-item>\n                           <jats:p>Juxtaposed left atrial appendage<\/jats:p>\n                        <\/jats:list-item>\n                        <jats:list-item>\n                           <jats:p>Accessory right ventricular chamber<\/jats:p>\n                        <\/jats:list-item>\n                     <\/jats:list>\n                  <\/jats:p>\n               <\/jats:sec>","DOI":"10.1136\/heartjnl-2017-311485","type":"journal-article","created":{"date-parts":[[2017,8,24]],"date-time":"2017-08-24T04:50:15Z","timestamp":1503550215000},"page":"1472-1472","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":1,"title":["An unusual cause of tachyarrhythmia in an otherwise healthy young man"],"prefix":"10.1136","volume":"103","author":[{"given":"Wessam A","family":"Raouf","sequence":"first","affiliation":[{"name":"Centre for Social and Preventive Medicine, Cairo University Hospitals, Cairo, Egypt"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Khaled","family":"Shams","sequence":"additional","affiliation":[{"name":"Cardiology Department, Ain Shams University, Cairo, Egypt"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Amr","family":"Mansour","sequence":"additional","affiliation":[{"name":"Cardiology Department, Ain Shams University, Cairo, Egypt"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[2017,8,24]]},"reference":[{"key":"2025092003552338000_103.18.1472.1","doi-asserted-by":"publisher","DOI":"10.1177\/0218492312472513"},{"key":"2025092003552338000_103.18.1472.2","doi-asserted-by":"crossref","first-page":"130","DOI":"10.4103\/0974-2069.132489","article-title":"Giant aneurysm of the atrial appendages in infants","volume":"7","author":"Lang","year":"2014","journal-title":"Ann Pediatr Cardiol"},{"key":"2025092003552338000_103.18.1472.3","doi-asserted-by":"publisher","DOI":"10.1111\/echo.12510"},{"key":"2025092003552338000_103.18.1472.4","doi-asserted-by":"publisher","DOI":"10.1161\/CIRCULATIONAHA.110.010363"},{"key":"2025092003552338000_103.18.1472.5","doi-asserted-by":"crossref","first-page":"K5","DOI":"10.1530\/ERP-14-0034","article-title":"A case of right atrial appendage aneurysm mimicking a pericardial cyst on echocardiogram","volume":"1","author":"Toufan","year":"2014","journal-title":"Echo Res Pract"}],"container-title":["Heart"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/syndication.highwire.org\/content\/doi\/10.1136\/heartjnl-2017-311485","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,9,20]],"date-time":"2025-09-20T10:55:28Z","timestamp":1758365728000},"score":1,"resource":{"primary":{"URL":"https:\/\/heart.bmj.com\/lookup\/doi\/10.1136\/heartjnl-2017-311485"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2017,8,24]]},"references-count":5,"journal-issue":{"issue":"18","published-online":{"date-parts":[[2017,8,24]]},"published-print":{"date-parts":[[2017,9]]}},"alternative-id":["10.1136\/heartjnl-2017-311485"],"URL":"https:\/\/doi.org\/10.1136\/heartjnl-2017-311485","relation":{},"ISSN":["1355-6037","1468-201X"],"issn-type":[{"type":"print","value":"1355-6037"},{"type":"electronic","value":"1468-201X"}],"subject":[],"published":{"date-parts":[[2017,8,24]]}}}