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Transthoracic echocardiography showed preserved left ventricular systolic function, normal left-sided filling pressures, right ventricular dilatation and an estimated right atrial pressure of 15 mmHg; N-terminal pro-brain natriuretic peptide was 57 pg\/mL. Cross-sectional imaging revealed a large multi-cystic anterior mediastinal mass occupying the left hemithorax, displacing the heart and abutting\/compressing major cardiopulmonary structures. Labour was induced at 34 weeks after clinical stabilisation. Three months postpartum, the patient re-presented with worsening dyspnoea and haemoptysis and underwent complete surgical resection. Pathology confirmed mature cystic teratoma and cardiopulmonary symptoms resolved after resection.<\/jats:p>","DOI":"10.1136\/bcr-2026-274681","type":"journal-article","created":{"date-parts":[[2026,8,12]],"date-time":"2026-08-12T12:40:32Z","timestamp":1786538432000},"page":"e274681","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":0,"title":["Pseudo\u2013heart failure in pregnancy complicated by preeclampsia: giant mediastinal teratoma with extrinsic cardiopulmonary compression"],"prefix":"10.1136","volume":"19","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5929-0303","authenticated-orcid":false,"given":"Jose","family":"Lopez Ventosa","sequence":"first","affiliation":[{"name":"Internal Medicine, University of Puerto Rico Medical Sciences Campus, San Juan, Puerto Rico, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Josean","family":"Reyes","sequence":"additional","affiliation":[{"name":"Internal Medicine, University of Puerto Rico Medical Sciences Campus, San Juan, Puerto Rico, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alex","family":"Cede\u00f1o","sequence":"additional","affiliation":[{"name":"Thoracic Surgery, University of Puerto Rico Medical Sciences Campus, San Juan, Puerto Rico, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marcel","family":"Mesa Pabon","sequence":"additional","affiliation":[{"name":"Cardiovascular Diseases, University of Puerto Rico Medical Sciences Campus, San Juan, Puerto Rico, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"239","published-online":{"date-parts":[[2026,8,12]]},"reference":[{"key":"2026091107251054000_19.8.e274681.1","unstructured":"Almeida PT , Heller D . 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