We present the unusual case of a 25-year-old female with shortness of breath, concomitant cough and a palpable mass in the left lower neck. The patient underwent thoracotomy via clamshell incision to remove the mass of preoperative unknown aetiology. A preoperative biopsy was inconclusive. Histology surprisingly revealed a lipoblastoma. The patient is without evidence of tumour relapse after 60 months. The lipoblastoma is a neoplasm of the embryonic adipose tissue. Typically, it is seen in the extremities and the trunk of children up to 3 years of age (Coffin et al. (Am J Surg Pathol 33:1705–12, 2009); Kok and Telisinghe (World J Surg 34:1517–22, 2010); De Saint Aubain Somerhausen et al. (Histopathology 52:294–98, 2008)). Appearances in adults are very rare. Age and location could have been therefore misleading in this patient. Surgeon, pulmonologist, radiologist and pathologist must be aware that this entity can also be found in the mediastinum of adults.

中文翻译：

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成人大纵隔脂肪母细胞瘤及其完全切除的首次报道：病例报告

我们介绍了一名25岁女性的不寻常病例，该患者呼吸急促，伴有咳嗽，左下颈明显有肿块。该患者通过翻盖切口进行了开胸手术，以去除术前未知病因的肿块。术前活检尚无定论。组织学令人惊讶地显示出成脂细胞瘤。患者在60个月后没有肿瘤复发的证据。脂肪母细胞瘤是胚胎脂肪组织的肿瘤。通常，它出现在3岁以下儿童的四肢和躯干中（Coffin等人（Am J Surg Pathol 33：1705-12，2009）； Kok和Telisinghe（World J Surg 34：1517-22） （2010）； De Saint Aubain Somerhausen等（组织病理学52：294-98，2008）。在成年人中很少出现。因此，年龄和位置可能会误导该患者。外科医生