Retroperitoneal fibrosis after chemotherapy.

We report the case of a patient with a non-Hodgkin lymphoma, who after a standard chemotherapy protocol, developed retroperitoneal fibrosis (RPF) in the absence of radiotherapy or other known causes. The final diagnosis was reached with the microscopic examination of tissue obtained by fine-needle aspiration and true-cut biopsy of the retroperitoneal mass. RPF can be related to chemotherapy alone.