Enteric Duplication Cyst Leading to a Volvulus in an Eight-Month-Old: A Case Report.

Enteric duplication cysts are rare congenital anomalies of the gastrointestinal tract. They may remain asymptomatic or present with non-specific symptoms such as vomiting, abdominal distension, and intestinal obstruction. We report the case of an eight-month-old male infant with no significant medical history who presented with a four-day history of vomiting that became bilious, accompanied by generalized hypotonia and dehydration. Clinical evaluation revealed a Glasgow Coma Scale of 11/15 and mild hyponatremia with otherwise normal laboratory results. Abdominal ultrasound showed inversion of the superior mesenteric artery and vein, raising suspicion for malrotation. Contrast-enhanced CT confirmed the "whirlpool sign" and identified a 50 mm enteric duplication cyst. Emergency surgery revealed a volvulus caused by the cyst, which was surgically corrected with successful resection. The postoperative course was uneventful. This case underscores the importance of early imaging and prompt surgical intervention in infants with bilious vomiting to prevent severe complications from rare conditions like enteric duplication cysts.