Table 1.
CT findings at UM and UPMC
| Derivation set |
Validation set |
||
|---|---|---|---|
| Finding | UM (n = 1095) | UM (n = 315) | UPMC (n = 499) |
| Abscess | 104 (9.5) | 43 (13.7) | 39 (7.8) |
| Obstruction | 108 (10.0) | 39 (12.4) | 42 (8.4) |
| Perirectal abscess | 25 (2.3) | 10 (3.2) | 16 (3.2) |
| Perforation | 15 (1.4) | 4 (1.3) | 10 (2.0) |
| Urolithiasis with complication | 3 (0.3) | 4 (1.3) | 2 (0.4) |
| Diverticulitis | 12 (1.1) | 2 (0.6) | 2 (0.4) |
| Pancreatitis | 9 (0.8) | 2 (0.6) | 4 (0.8) |
| Pyelonephritis | 2 (0.2) | 0 (0) | 2 (0.4) |
| Other serious findinga | 10 (0.9) | 6 (1.9) | 8 (1.6) |
| Inflammation | 597 (54.5) | 192 (60.9) | 248 (49.7) |
| Complications | 184 (16.8) | 67 (21.3) | 80 (16.0) |
a
UM validation: cholangitis, bowel ischemia, incarcerated umbilical hernia, psoas myositis, osteomyelitis, angioedema; UPMC validation: two instances of pneumonia, pericarditis, pouchitis, IMV thrombosis, intussception, DVT, hydrosalpinx.
CT: computed tomography; UM: University of Michigan; UPMC: University of Pittsburgh Medical Center; IMV: inferior mesenteric vein; DVT: deep vein thrombosis.