Primary squamous cell carcinoma of seminal vesicle: an extremely rare case report with literature review.

Primary squamous cell carcinoma of seminal vesicle is extremely rare, and most cases regarding seminal vesicle tumors failed to address this kind of tumor. A 54-year-old male patient presented with intermittent painless visual hematuria for 6 months was hospitalized. Ultrasonography, computerized tomography and magnetic resonance imaging demonstrated a 4.4 cm × 3.6 cm × 3.0 cm mixed tumorous lesion in the left seminal vesicle. A transrectal needle biopsy revealed severe chronic inflammation. The mass was completely resected in a laparoscopic approach and was verified as a moderately differentiated squamous cell carcinoma in the seminal vesicle by post-surgical histopathological examination. The patient received totally 5 cycles of chemotherapy. A rectal metastasis was detected 7 months after the surgery.