Imaging findings in idiopathic pelvic fibrosis

Two patients presented with ureteric obstruction, and voiding symptoms and constipation, respectively, and were examined by means of intravenous urogr aphy and computed tomography. One patient was additionally examined by mean s of MR tomography. After CT (performed in both patients) and MRT (performe d in one patient) had shown a diffuse, contrast-enhancing, infiltrating pro cess in the small pelvis with infiltration of adjacent organs and vessels, surgical biopsy proved the diagnosis of idopathic pelvic fibrosis. Extensio n of retroperitoneal fibrosis below the pelvic rim is very rare. Clinical s ymptoms of pelvic fibrosis are variable and imaging findings may lead to a broad list of differential diagnoses. We present two patients with idiopath ic pelvic fibrosis and discuss radiological findings and differential diagn oses of this rare disease.