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.
Sigmoid mesocolon hernias are divided by some authors 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 distinguish between them.
- 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
- 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