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Ileocaecal valve (ileocecal junction)

The ileocecal valve (also known as Bauhin’s valve) is a sphincter-like structure located at the junction of the terminal ileum and the cecum in the right lower abdomen. It is formed by two crescentic mucosal folds that project into the lumen of the cecum, functioning as a physiological sphincter that regulates the flow of chyme from the small intestine into the large intestine.

The valve prevents reflux of colonic contents, limits bacterial backflow into the ileum, and contributes to coordinated intestinal transit. Its competence varies, but function is enhanced by tonic contraction of the surrounding circular smooth muscle and the ileocecal sphincter mechanism.

Anatomically, the ileocecal valve lies close to the appendiceal orifice and is clinically significant in appendicitis, Crohn’s disease, tuberculosis, and colonic carcinoma. Endoscopically, it serves as an important landmark during colonoscopy.

Synonyms

  • Bauhin’s valve

  • Ileocecal orifice

  • Ileocecal junctional valve

Function

  • Regulates passage of intestinal contents from ileum into cecum

  • Prevents reflux of fecal matter from cecum to ileum

  • Reduces risk of bacterial contamination of the small intestine

  • Functions as a landmark in colonoscopy and surgery

Nerve Supply

  • Sympathetic innervation: From superior mesenteric plexus

  • Parasympathetic innervation: From vagus nerve via superior mesenteric plexus

  • Autonomic supply regulates sphincteric tone and peristalsis

Arterial Supply

  • Supplied by branches of the ileocolic artery (branch of superior mesenteric artery)

Venous Drainage

  • Corresponds to arterial supply via the ileocolic vein, which drains into the superior mesenteric vein → portal vein

MRI Appearance

T1-weighted images:

  • Valve lips appear as intermediate signal soft-tissue folds protruding into the cecum

  • Surrounded by hyperintense pericecal fat

T2-weighted images:

  • Valve tissue is intermediate to low signal, lumen fluid is hyperintense

  • Pathology (inflammation, edema, mass) appears as thickened, hyperintense folds

STIR:

  • Fat suppression improves delineation of valve margins

  • Highlights perivalvular edema and inflammatory changes in Crohn’s disease or infection

T1 Fat-Saturated (Pre-contrast):

  • Valve appears as intermediate signal folds against suppressed fat background

  • Distinguishes valve from adjacent mesenteric fat and vessels

T1 Fat-Saturated Post-Contrast (Gadolinium):

  • Normal valve shows mild uniform mucosal enhancement

  • Pathologies (Crohn’s disease, neoplasms, tuberculosis) show thickened, irregular, and heterogeneous enhancement

MRI Non-Contrast 3D Imaging:

  • Provides 3D reconstruction of ileocecal junction and relation to appendix and cecum

  • Useful for pre-surgical mapping in Crohn’s disease and tumor assessment

CT Appearance

CT Pre-Contrast:

  • Valve appears as soft-tissue folds at ileocecal junction; lumen may contain fluid, air, or fecal matter

  • Difficult to differentiate without contrast

CT Post-Contrast:

  • Valve mucosa enhances uniformly, allowing clear distinction from adjacent cecal and ileal walls

  • Pathologies present as thickened folds, irregular enhancement, or mass-like lesions

  • Useful in diagnosing Crohn’s disease, ileocecal tuberculosis, carcinoma, and intussusception

CT images

Ileocaecal valve CT axial anatomy image -img-00000-00000

CT images

Ileocaecal valve CT axial image

MRI image

Ileocaecal valve sagittal mri anatomy image -img-00000-00000