Testicular cancer is responsible for approximately 0.1% of all cancer deaths in the USA, and seminoma is the most common type of testicular tumor. Ultrasonography is the primary imaging modality for accessing testicular and extratesticular lesions, while magnetic resonance imaging can be used for problem solving in lesion characterization in certain cases. CT imaging is usually performed for retroperitoneal staging of testicular cancer metastasis and follow-up after treatment. Extratesticular masses are common, yet rarely malignant. Imaging plays an important role in primary diagnosis of testicular cancer and differentiating it from common non-neoplastic findings. The purpose of this article is to review various imaging findings in testicular and extratesticular masses.

在美国，睾丸癌约占所有癌症死亡的0.1％，而精原细胞瘤是最常见的睾丸肿瘤。超声检查是进入睾丸和睾丸外病变的主要成像方式，而在某些情况下，磁共振成像可用于解决病变特征中的问题。CT成像通常用于睾丸癌转移的腹膜后分期和治疗后的随访。睾丸外肿块很常见，但很少恶变。影像学在睾丸癌的初步诊断以及将其与常见的非肿瘤发现区分开来方面起着重要作用。本文的目的是回顾睾丸和睾丸外肿块的各种影像学表现。