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- 90%
of SBO are caused by adhesions, hernias
- SBO
from adhesions may spontaneously resolve
- Hernias
may be external (e.g. inguinal, femoral, incisional) or internal (e.g.
paraduodenal, paracecal)
- External
– protrusion through defects in structures external to peritoneal
cavity
- Internal
– protrusion through intraperitoneal defects
- Torsion
of bowel around its mesentery
- Primary
– seen in children with midgut malrotation
- Secondary
– seen in adults and associated with adhesions, internal hernias,
tumors
- Can
cause mesenteric ischemia, infarction
- Intussusception
– Telescoping of bowel to form inner loop (intussusceptum) and outer
loop (intussuscipiens)
- Colonic
lesions, especially proximal ones, can clinically mimic SBO, but can be
identified with barium studies.
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