Focal Myositis of the Iliopsoas Muscle - A Benign Pseudotumour: Ultrasound Appearance in Correlation with CT and MRI - Hoffmann, A; Buitrago Téllez, C; Tolnay, M; Tyndall, A; Steinbrich, W (Ultraschall in der Medizin - European Journal of Ultrasound, 2006)