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"Piglet" sign of the upper pons (axial T2 MRI)

"Piglet" (or "piglet face") sign of the upper pons in an axial T2-weighted MRI sequence (green circle). In the ʺpiglet faceʺ sign, the pons takes on a distinctive resemblance to the snout of a piglet, whereas the internal carotid arteries and the fourth ventricle form, respectively, the eyes and mouth. (Source: Koul P, Harjpal P, Raghumahanti R. Osmotic demyelination syndrome: a rare clinical image. Diagnostics [Basel] 2023;13[21]:3393. Creative Commons Attribution 4.0 International [CC BY 4.0] license,

Associated Disorders

  • Alcoholism
  • Extrapontine myelinolysis
  • Hyperosmolar hyperglycemic state
  • Hypokalemia
  • Malnutrition
  • Osmotic myelinolysis