Abstract
The authors present an unusual case of atypical iliopsoas bursitis in an 81 years-old female patient. The patient asked for medical advice due to a chronic left hip and lower abdominal pain with no specific characteristics. Physical examination revealed a palpable left-sided pelvic mass. Ultrasound examination demonstrated a purely cystic mass that was presumed to be an ovarian cystic malignancy. The patient was referred for an MRI examination, which showed a cystic lesion extending from the left iliac crest to the anterior aspect of the ipsilateral hip joint (maximum diameter 18 cm), coursing below the iliopsoas tendon indicative of an extremely distended iliopsoas bursa.