2025 Volume 61 Issue 2 Pages 179-184
Intra-abdominal cysts are often identified during the fetal period, but cysts occupying the left upper quadrant are rare. We report a case of a congenital splenic cyst that was difficult to diagnose on the basis of preoperative findings and required operation during the neonatal period. The patient was a girl in whom an intra-abdominal cyst was detected by prenatal ultrasonography. A fetal magnetic resonance imaging and postnatal abdominal ultrasonography revealed a cystic lesion in the left upper quadrant, but a diagnosis could not be made. Because the baby continued to vomit, she underwent laparotomy on the 8th day of age and a splenic cyst was found. To minimize the resection surface, a dome resection was performed, which allowed the splenic volume to be maintained without any complication. Her platelet count had increased during the postoperative course but almost normalized six months after surgery. She grew up without any overwhelming infection or recurrence of the cyst. A case of splenic cyst requiring treatment during the neonatal period is extremely rare, but early intervention for symptomatic intra-abdominal cysts should be considered regardless of age.
