A Peculiar Phenotype Hindering Early Diagnosis: Multiple Endocrine Neoplasia 2B Syndrome

A 28-year-old Chinese man presented to the emergency department (ED) with acute onset of abdominal distension, generalized abdominal pain, and repeated vomiting. There was no fever, diarrhea, or gastrointestinal bleeding. He reported chronic constipation requiring ED attendance five years ago due to abdominal distension and nausea, but his bowel habit had not changed recently.

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