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"Piglet" (or "piglet face") sign of the upper pons (FLAIR MRI)

"Piglet" (or "piglet face") sign of the upper pons in FLAIR MRI sequence (red 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