[Enlarged iliopsoas bursa. A rare cause of inguinal mass].

Bursa iliopsoatica is a well-defined anatomical structure lying under the corresponding muscle on the pelvis and hip joint. If it becomes large, it can be an uncommon cause of an inguinal mass with symptoms from compressed neighbour structures. An enlarged bursa can be associated with arthritis and arthrosis of the hip. We describe a patient with an inguinal tumour, with radicular pain, and discuss the diagnostic approach, pathogenesis and treatment.