Congenital Hydronephrosis Due to Pyeloureteral Atresia: A Case Report.

Intussusception is a leading cause of acute intestinal obstruction in infants, typically presenting with a classic triad of intermittent abdominal pain, vomiting, and currant jelly stools. However, atypical presentations can lead to diagnostic delays, increasing the risk of complications. This report describes a seven-month-old male with an unusual presentation of lethargy and irritability, without overt gastrointestinal symptoms. Initial clinical examination, including abdominal palpation and laboratory tests, was inconclusive. However, abdominal ultrasonography revealed a subtle "target sign," confirming intussusception despite the absence of hallmark signs. The patient underwent successful hydrostatic reduction under fluoroscopic guidance, with no pathological lead points identified. The case highlights the importance of maintaining clinical suspicion for intussusception in atypical presentations, emphasizing the critical role of early imaging in achieving timely diagnosis and favorable outcomes. Additionally, it underscores the need for vigilant post-reduction monitoring and parental education regarding recurrence.