Fatty-falciform ligament appendage torsion (F-FLAT) is a rare condition manifested by torsion of the extraperiotoneal fat within the falciform ligament. It is similar to intraperitoneal focal fatty infarctions, including omental infarction and epiploic appendagitis. We report herein the first case of F-FLAT in a pediatric patient that failed conservative management. Ultrasound and CT scan facilitated prompt diagnosis of this rare finding and expedited a quick trial of conservative management. Despite conservative treatment, symptoms persisted for 4 weeks, but resolved after laparoscopic single-site surgical resection. In this report, we discuss the clinical features, key radiographic findings, and treatment options for this unique condition. This is only the third reported pediatric case of F-FLAT in the literature, and the first pediatric case to require surgical resection.