Abstract
A 20-year-old man presented to the emergency department with a small painful swelling located in the midline of the epigastric region. His medical history included asthma and extramucosal pyloromyotomy for hypertrophic pyloric stenosis when he was a baby. His vital signs were normal. Abdominal ultrasound (US) showed a small hypoechoic formation located in the subcutaneous adipose tissue that penetrated into the abdominal cavity through an orifice of about 7 mm in the linea alba.
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