Peno-scrotal metastasis of colorectal adenocarcinoma: A case report and review of the literature.

Introduction: Colorectal cancer is the second most common cause of death worldwide and may present as metastatic disease involving the liver, lungs and bones, and pelvic organs. Penile and scrotal metastasis may occur secondary to primary tumors originating from the genito-urinary tract.

Case Presentation: We present a case of rectal adenocarcinoma metastatic to the penis and scrotum s/p chemotherapy and radiotherapy. His metastatic involvement was complicated by infections, necrosis and growth of maggots. Patient underwent wide excision and debridement of the metastatic deposits in the pubic, penile, scrotal and perineal region in addition to split-tissue skin graft from the right anterior thigh to cover the pubic region, the remainder of the penile shaft, and the scrotum.

Clinical Discussion: Peno-scrotal metastasis secondary to rectal adenocarcinoma is a rare condition. It may present as malignant priapism, hematuria, obstructive urinary symptoms occurring when there is urethral involvement. The mechanism of metastasis may be due to retrograde venous flow from the vesical, pudendal, hemorrhoidal plexuses, and the prostatic venous plexus draining the cavernosal veins of the penis. Additionally, lymphatic involvement and spread may play an important role in the spread of the disease. Treatment of such conditions relies on chemotherapy and radiotherapy and surgery for local control and symptomatic treatment.

Conclusion: This article describes the rare occurrence of peno-scrotal metastasis of rectal adenocarcinoma and provides an overview on diagnosis, etiology, and management of the disease.