{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,8,27]],"date-time":"2025-08-27T17:10:01Z","timestamp":1756314601241,"version":"3.44.0"},"reference-count":8,"publisher":"BMJ","issue":"11","content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["BMJ Case Rep"],"accepted":{"date-parts":[[2019,10,21]]},"published-print":{"date-parts":[[2019,11]]},"abstract":"<jats:p>Hamman\u2019s sign refers to an unusual click that occurs in synchrony with heart sounds, and is pathognomonic for left-sided pneumothorax and spontaneous mediastinum. In this case, a 17-year-old man living in a rural area used his smartphone to record an audible clicking sound emanating from his thorax. This occurred following coughing episodes secondary to an upper respiratory tract infection. Initially, this prompted a request for an echocardiogram to exclude structural cardiac anomalies; however, Hamman\u2019s sign was also considered. This facilitated the timely diagnosis of pneumothorax to be made via a simple chest radiograph, one of the only imaging modalities available at the patient\u2019s rural health service. To promote awareness of this rare clinical phenomenon, this report also presents the patient\u2019s own sound recording of Hamman\u2019s sign and corresponding chest radiographs.<\/jats:p>","DOI":"10.1136\/bcr-2019-231418","type":"journal-article","created":{"date-parts":[[2019,11,20]],"date-time":"2019-11-20T05:04:47Z","timestamp":1574226287000},"page":"e231418","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":2,"title":["Smartphone aiding in analysis of Hamman\u2019s sign"],"prefix":"10.1136","volume":"12","author":[{"given":"Priyanka","family":"Thakeria","sequence":"first","affiliation":[{"name":"Cardiology Department, Townsville Hospital and Health Service, Townsville, Queensland, Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nita","family":"Danda","sequence":"additional","affiliation":[{"name":"Cardiology Department, Townsville Hospital and Health Service, Townsville, Queensland, Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Anudeep","family":"Gupta","sequence":"additional","affiliation":[{"name":"Cardiology Department, Townsville Hospital and Health Service, Townsville, Queensland, Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dharmesh","family":"Anand","sequence":"additional","affiliation":[{"name":"Cardiology Department, Townsville Hospital and Health Service, Townsville, Queensland, Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[2019,11,19]]},"reference":[{"key":"2025082709534714000_12.11.e231418.1","first-page":"1","article-title":"Spontaneous mediastinal emphysema","volume":"64","author":"Hamman","year":"1939","journal-title":"Bull Johns Hopkins Hosp"},{"key":"2025082709534714000_12.11.e231418.2","doi-asserted-by":"publisher","DOI":"10.7326\/0003-4819-13-6-923"},{"key":"2025082709534714000_12.11.e231418.3","doi-asserted-by":"crossref","first-page":"1208","DOI":"10.1016\/S0140-6736(00)76601-3","article-title":"Systolic clicks due to left-sided pneumothorax","volume":"234","author":"Scadding","year":"1939","journal-title":"The Lancet"},{"key":"2025082709534714000_12.11.e231418.4","doi-asserted-by":"publisher","DOI":"10.1016\/0002-9343(55)90454-X"},{"key":"2025082709534714000_12.11.e231418.5","doi-asserted-by":"crossref","first-page":"31","DOI":"10.1378\/chest.56.1.31","article-title":"Clicks and sounds (whoops) in left-sided pneumothorax. clinical and photographic study","volume":"56","author":"Roelandt","year":"1969","journal-title":"Dis Chest"},{"key":"2025082709534714000_12.11.e231418.6","doi-asserted-by":"publisher","DOI":"10.1378\/chest.102.4.1281"},{"key":"2025082709534714000_12.11.e231418.7","article-title":"Popping pneumothorax","volume":"68","author":"Remmelts","year":"2010","journal-title":"Neth J Med"},{"key":"2025082709534714000_12.11.e231418.8","doi-asserted-by":"crossref","first-page":"86","DOI":"10.5858\/arpa.2014-0593-OA","article-title":"A comparative study between smartphone-based microscopy and conventional light microscopy in 1021 dermatopathology specimens","volume":"140","author":"Jahan-Tigh","year":"2016","journal-title":"Arch Pathol Lab Med"}],"container-title":["BMJ Case Reports"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/syndication.highwire.org\/content\/doi\/10.1136\/bcr-2019-231418","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,8,27]],"date-time":"2025-08-27T16:53:53Z","timestamp":1756313633000},"score":1,"resource":{"primary":{"URL":"https:\/\/casereports.bmj.com\/lookup\/doi\/10.1136\/bcr-2019-231418"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2019,11]]},"references-count":8,"journal-issue":{"issue":"11","published-online":{"date-parts":[[2019,11,19]]},"published-print":{"date-parts":[[2019,11]]}},"alternative-id":["10.1136\/bcr-2019-231418"],"URL":"https:\/\/doi.org\/10.1136\/bcr-2019-231418","relation":{},"ISSN":["1757-790X"],"issn-type":[{"type":"electronic","value":"1757-790X"}],"subject":[],"published":{"date-parts":[[2019,11]]}}}