Abstract：
Seminoma accounting for approximately 98% of malignant testicular tumours and it typically presents as a painless, palpable solid mass in the testis. Seminomas presenting only as a solitary neck mass are very rare. This case report describes a previously healthy 35-year-old male that presented with a 3-month history of the incidental discovery of a mass in his right neck. He had no testicular symptoms. He underwent neck ultrasound, contrast-enhanced ultrasound, computed tomography and positron emission tomography. Serum human chorionic gonadotropin (3.90 mIU/ml) was raised and alpha-fetoprotein (3.79 ng/ml) was within normal limits. Clinical examination and imaging examinations did not find any suspicious signs of testicular cancer. Biopsy from the neck mass confirmed the diagnosis of metastatic seminoma. The case report presents the ultrasound and contrast-enhanced ultrasound characteristics of seminoma and provides an update of the literature regarding this very rare metastatic site for seminomas.
摘要：
精原细胞瘤约占恶性睾丸肿瘤的98％，通常表现为无痛，睾丸中明显的固体肿块。仅表现为孤立性颈部肿块的精液瘤非常罕见。此病例报告描述了一名先前健康的35岁男性，他有3个月的右颈部偶然发现肿块的历史。他没有睾丸症状。他做了颈部超声检查,超声造影,计算机断层扫描和正电子发射断层扫描。血清人绒毛膜促性腺激素（3.90mIU/ml）升高，甲胎蛋白（3.79ng/ml）在正常范围内。临床检查和影像学检查未发现任何可疑的睾丸癌征象。颈部肿块活检证实了转移性精原细胞瘤的诊断。病例报告介绍了精原细胞瘤的超声和对比增强超声特征，并提供了有关精原细胞瘤这种非常罕见的转移部位的文献更新。
