**Core Concept**
Testicular cancer staging involves assessing the extent of tumor spread within the testis, epididymis, and beyond. The TNM staging system is widely used for this purpose.

**Why the Correct Answer is Right**
In this scenario, the tumor has not invaded blood vessels but has spread to the epididymis, indicating a higher stage of disease. The TNM system categorizes testicular cancer based on tumor size (T), lymph node involvement (N), and metastasis (M). Since the tumor has not invaded blood vessels, M is not applicable. The involvement of the epididymis suggests T2 or higher, but without lymph node involvement, the correct stage is T2.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it doesn't provide a specific stage based on the given information.
**Option B:** This option is incorrect as it suggests a stage without considering the involvement of the epididymis.
**Option C:** This option is incorrect as it implies lymph node involvement, which is not mentioned in the question.

**Clinical Pearl / High-Yield Fact**
When assessing testicular cancer stage, it's essential to remember that the TNM system takes into account the tumor's size, lymph node involvement, and metastasis. Vascular invasion significantly increases the stage, making it crucial to examine the tumor's histopathology carefully.

**Correct Answer:** .