This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urology, Subject name: Surgery
High inguinal orchidectomy specimen showed tumor testis with involvement of epididymis without vascular invasion; Stage is 
Select and explain. 
A. T1, B. T2, C. T3, D. T4
A: T1
Answer: A: T1 
Explanation: In this case TNM stage is T1 T0 : No evidence of tumor Tis : Carcinoma in situ T1 : Tumor limited to testis and epididymis. Vascular/lymphatic invasion not present. T2 : Tumor limited to testis and epididymis with Vascular/lymphatic involvement. T3 : Tumor invades to spermatic cord with or without Vascular/lymphatic involvement T4 : Tumor invades to scrotum with or without Vascular/lymphatic involvement. Reference : SRB's Manual of Surgery, 6th Edition, page no = 1072.