{
  "abstract": "A man in his 40s was admitted to our hospital after an enlarged heart was incidentally discovered at a local hospital during a routine medical evaluation for palpitations lasting 4 months. Physical examination and laboratory investigations were unremarkable. Transthoracic echocardiography revealed a large, well-circumscribed cystic mass in the mediastinum, measuring approximately 121×96 mm. Scattered floating echogenic foci were observed within the lesion. The mass exerted extrinsic compression on the right atrium, resulting in increased intracavitary flow velocity, with a peak velocity of 131 cm/s and a corresponding pressure gradient of 7 mm Hg. The echocardiographic and non-enhanced chest CT findings are shown in figure 1.",
  "authors": [
    {
      "affiliations": [
        "Radiology, The First Hospital of Jilin University, Changchun, Jilin, China"
      ],
      "name": "Jing Wang"
    },
    {
      "affiliations": [
        "Radiology, The First Hospital of Jilin University, Changchun, Jilin, China"
      ],
      "name": "Dianbo Cao"
    }
  ],
  "title": "Man in his 40s with palpitations",
  "uid": "f26f25ed-1946-5d7b-88e7-95b883f84b9a"
}