Hibernoma is a rare benign tumour arising from remnants of fetal brown adipose tissue. We reported a rare case of hibernoma located in the neck. We also discuss the radiographic findings, pathologic features, and management of hibernomas. Introduction The hibernoma is an uncommon, benign soft tissue tumor arising from vestigial remnants of so-called brown fat. It most commonly occurs in the interscapular regions, but there are also a number of cases originating in sites normally devoid of brown fat. A hibernoma in the head and neck region is very rare, and few cases in this location have been reported. We present the clinical, radiographic, and pathologic features of giant hibernoma that was located in the neck. Case report A 44-year-old man was referred to our institution for evaluation of an enlarging soft-tissue mass on his neck. The patient had noticed the mass 16 months earlier, and it had gradually increased in size (Figure 1). On physical examination, a 26 x 16-cm mass from the posterior region of the neck back of the neck and coming into contact with the upper back. The mass was firm, rubbery, and slightly tender to palpation. No overlying warmth or erythema was noted, and no lymphadenopathy was found. The patient had no neurological deficit. CT scan demonstrated a well defined large mass in the back of the neck (Figure 2). The mass did not invade the surrounding structures. Open biopsy was undertaken, and pathology findings were consistent with a hibernoma. Surgical resection was performed under general anesthesia, yielding a 26 x 16 x 12, 5-cm, rubbery, encapsulated mass (Figure 3). It was excised from the surrounding tissue without difficulty. Histology confirmed tumor characteristics consistent with a hibernoma, showing large multivacuolated cells, scant cytoplasm, and central nuclei (Figure 4). The postoperative course was unremarkable and the patient remains free of disease 2 years after the diagnosis.
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机译：纤维瘤是一种罕见的良性肿瘤，由胎儿棕色脂肪组织的残留物引起。我们报道了一种罕见的颈部颈部冬眠瘤病例。我们还将讨论影像学发现，病理特征和冬眠瘤的处理。简介子宫肌瘤是一种罕见的良性软组织肿瘤，由残留的所谓棕色脂肪残留引起。它最常发生在肩inter骨间区域，但也有许多病例起源于通常没有棕色脂肪的部位。头部和颈部区域的子宫肌瘤非常罕见，并且在该位置很少有病例报道。我们介绍了位于颈部的巨大冬眠瘤的临床，影像学和病理学特征。病例报告一名44岁的男子被转介到我们的机构，以评估其颈部软组织肿块的扩大。患者在16个月前注意到了肿块，并且肿块的大小逐渐增加（图1）。身体检查时，从颈部后颈部的后部区域开始有26 x 16厘米的肿块，并与上背部接触。肿块坚硬，有橡胶感，触诊时略有压痛。没有发现过度的温暖或红斑，也没有发现淋巴结肿大。该患者无神经功能缺损。 CT扫描显示颈部后部明显肿大（图2）。群众没有入侵周围的结构。进行了活检，病理结果与冬眠瘤一致。手术切除在全身麻醉下进行，产生26 x 16 x 12、5厘米，橡胶状，包封的肿块（图3）。从周围组织切下没有困难。组织学证实与冬眠瘤一致的肿瘤特征，表现为大的多血管化细胞，胞质少和中心核（图4）。术后病程不明显，诊断后2年患者仍无疾病。
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