病历摘要：患者男性，29岁，阴囊左侧坠胀2个月。体检：阴囊皮肤无红肿，左睾丸增大，扪及一个约5cm×4cm×4cm大小的肿块，质地硬，不光滑，无压痛，透光试验阴性。右睾丸附睾未见异常。阴囊双侧未扪及曲张静脉。
首先考虑哪一个诊断？（）
A.慢性左睾丸炎
B.感染性左睾丸鞘膜积液
C.左睾丸结核
D.左睾丸梅毒
E.左睾丸肿瘤
F.左腹股沟斜疝
参考答案：E
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