Diagnostic performance of ultrasound and CT-scan for different anatomical areas
| Sensitivity | Specificity | P value* | PPV | NPV | |||||
| Ultrasound | CT | Ultrasound | CT | Ultrasound | CT | Ultrasound | CT | ||
| Recto-sigmoid | 59.3% (16/27) | 33.3% (9/27) | 97.0% (64/66) | 89.4% (59/66) | 0.815 | 88.9% (16/18) | 56.2% (9/16) | 85.3% (64/75) | 76.6% (59/77) |
| Pelvic peritoneum | 74.6% (44/59) | 59.3% (35/59) | 94.1% (32/34) | 91.2% (31/34) | 0.152 | 95.7% (44/46) | 92.1% (35/38) | 68.1% (32/47) | 56.4% (59/77) |
| Major omentum | 82.6% (38/46) | 76.1% (35/46) | 97.9% (46/47) | 93.6% (44/47) | 1.000 | 97.4% (38/39) | 92.1% (35/38) | 85.2% (46/54) | 80.0% (44/55) |
| Abdominal peritoneum | 76.7% (33/43) | 65.1% (28/43) | 94.0% (47/50) | 88.0% (44/50) | 0.824 | 91.7% (33/36) | 82.4% (28/34) | 82.5% (47/57) | 74.6% (44/59) |
| Bowel | 41.7% (5/12) | 58.3% (7/12) | 95.1% (77/81) | 91.4% (74/81) | 0.227 | 55.6% (5/9) | 50.0% (7/14) | 91.7% (77/84) | 93.7% (74/79) |
| Root of mesentery | 25.0% (1/4) | 25.0% (1/4) | 100.0% (89/89) | 92.1% (82/89) | 0.700 | 100% (1/1) | 14.3% (1/7) | 96.7% (89/92) | 95.3% (82/86) |
| Mesogastrium | 50.0% (6/12) | 50.0% (6/12) | 93.8% (76/81) | 92.6% (75/81) | 1.000 | 54.5% (5/11) | 50.0% (6/12) | 92.7% (76/82) | 92.6% (75/81) |
| Hepatic hilum | 30.0% (3/10) | 20.0% (2/10) | 100.0% (83/83) | 100.0% (83/83) | 1.000 | 100% (3/3) | 100% (2/2) | 92.2% (83/90) | 91.2% (83/91) |
| Liver parenchyma | 100.0% (2/2) | 100.0% (2/2) | 100.0% (91/91) | 100.0% (91/91) | 1.000 | 100% (2/2) | 100% (2/2) | 100% (91/91) | 100% (91/91) |
| Spleen parenchyma | 40.0% (2/5) | 40.0% (2/5) | 100.0% (88/88) | 100.0% (88/88) | 1.000 | 100% (2/2) | 100% (2/2) | 96.7% (88/91) | 96.7% (88/91) |
| Pelvic lymph nodes | 46.2% (6/13) | 38.5% (5/13) | 98.8% (79/80) | 95.0% (76/80) | 0.754 | 85.7% (6/7) | 55.6% (5/9) | 91.9% (79/86) | 90.5% (76/84) |
| Para-aortic lymph nodes | 44.4% (8/18) | 44.4% (8/18) | 98.7% (74/75) | 94.7% (71/75) | 1.000 | 88.9% (8/9) | 66.7% (8/12) | 88.1% (74/84) | 87.7% (71/81) |
| Ascites | 97.8% (45/46) | 89.1% (41/46) | 97.9% (46/47) | 76.6% (36/47) | 0.210 | 97.8% (45/46) | 78.8% (41/52) | 97.8% (46/47) | 87.8% (36/41) |
*McNemar test for comparing sensitivity and specificity.
CT, computed tomography; NPV, negative predictive value; PPV, positive predictive value.