Retroperitoneal liposarcoma manifested as an inguinoscrotal mass: a case report

The inguinal canal communicates with the retroperitoneum. This creates a pathway for the extension of retroperitoneal sarcomas into the inguinoscrotal region. A 65-year-old Japanese male presented with a giant painless right inguinoscrotal mass that started growing 2 years before presentation. Computed tomography and magnetic resonance imaging revealed a giant dumbbell-shaped mass with a narrow segment in the inguinal canal connecting the retroperitoneal component with the scrotal component. En bloc surgical removal of the tumor was carried out. Histopathological analysis of the resected tumor revealed a well-circumscribed atypical lipomatous tumor in the retroperitoneum and a dedifferentiated liposarcoma in the inguinoscrotal region. In conclusion, we experienced a case of giant liposarcoma that appeared as a dumbbell-shaped tumor extending from the retroperitoneum to the scrotum through the inguinal canal. In cases involving an inguinoscrotal mass, the possibility of extension of retroperitoneal sarcoma into the inguinoscrotal region should be considered.