1. Department of General Surgery, Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil
2. Department of Vascular Surgery, Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil
3. Department of Radiology and Imaging, Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil
4. Medical School of Medicine, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil