title: [Intrapulmonary rupture of a dermoid cyst: MRI findings].
abstract: We report a case of dermoid cyst of the mediastinum ruptured into the lung. Only a few reports of ruptured mediastinal dermoid cyst have appeared in the literature. A 18-year-old female patient developed a tumor in the anterior mediastinum, which was coincidentally detected by a conventional chest X-ray. CT and MRI demonstrated two components: a cystic mediastinal mass and adjacent parenchymatous condensation. The cystic mass (no enhancement during or after injection) had a fatty structure: high-intensity T1 signal and low-intensity T2 signal. The thin wall (low-intensity signal on T1 and T2) was strongly enhanced during the systemic time and was ruptured. The parenchymatous condensation included a fatty effusion and an inflammatory reaction with the same T1 signal as the cyst, remaining slightly hyperintense on T2 with enhancement after injection. Cine-MRI demonstrated that the mass and the compressed right atrium were independent.
authors.affiliation: Service de Radiologie, Hôpital Tenon, 4, rue de la Chine, 75970 Paris 20 AP-HP, UPMC.
authors.forename: Z Y
authors.initials: ZY
authors.lastname: Shao
authors.forename: M-A
authors.initials: MA
authors.lastname: Massiani
authors.forename: B
authors.initials: B
authors.lastname: Bazelly
authors.forename: M
authors.initials: M
authors.lastname: Antoine
authors.forename: A
authors.initials: A
authors.lastname: Khalil
authors.forename: M-F
authors.initials: MF
authors.lastname: Carette
mesh_terms: D000293:Adolescent; D003884:Dermoid Cyst / Q000150:complications / Q000473:pathology*; D005260:Female; D006801:Humans; D008168:Lung; D008279:Magnetic Resonance Imaging; D008479:Mediastinal Neoplasms / Q000150:complications / Q000473:pathology*; D012422:Rupture, Spontaneous