Intersigmoid hernias, also known as sigmoid mesocolon hernias, occur when small bowel loops protrude into a peritoneal pocket (intersigmoid fossa) formed between two adjacent sigmoid segments and their mesentery.
Sigmoid mesocolon hernias account for ~5% of all internal hernias 1,2.
Some authors divide sigmoid mesocolon hernias into three categories 1,3:
- intersigmoid hernia
- transmesosigmoid hernia
- intermesosigmoid hernia
It is difficult, maybe impossible, to distinguish these subtypes preoperatively with no clear radiographic sign identified to distinguish among the three subtypes 1,2. Thus, most radiologists and surgeons just refer to intersigmoid hernias, rather than trying to differentiate between them.
- 1. Takeyama N, Gokan T, Ohgiya Y et-al. CT of internal hernias. Radiographics. 25 (4): 997-1015. doi:10.1148/rg.254045035 - Pubmed citation
- 2. Mathieu D, Luciani A. Internal abdominal herniations. AJR Am J Roentgenol. 2004;183 (2): 397-404. AJR Am J Roentgenol (citation) - Pubmed citation
- 3. Benson JR, Killen DA. INTERNAL HERNIAS INVOLVING THE SIGMOID MESOCOLON. Ann. Surg. 1964;159 : 382-4. Ann. Surg. (link) - Free text at pubmed - Pubmed citation
- lesser sac (foramen of Winslow) hernia
- paraduodenal hernia (left and right)
- pericaecal hernia
- sigmoid mesocolon hernias
small bowel mesentery internal hernia
- transmesenteric hernia
- intramesenteric hernia
- transomental hernia
- supravesical hernia
- pelvic internal hernia
- falciform ligament hernia
- internal hernia due to gastric bypass surgery