IntroductionHydrocephalus is a neurological condition marked by abnormal cerebrospinal fluid (CSF) accumulation, causing ventricular enlargement and potential brain damage [1,2]. It results from CSF overproduction, flow obstruction, or impaired absorption, presenting with headaches, nausea, visual disturbances, and cognitive decline, which is diagnosed via CT or MRI [3]. Ventriculoperitoneal (VP) shunts, which divert CSF to the peritoneum, treat various forms of hydrocephalus, including congenital, tumor-related, and normal pressure hydrocephalus [4]. However, VP shunts carry 2-20% complication risks like infection, hemorrhage, and obstruction [4]. A rare but serious complication of VP shunt is trapped fourth ventricle (TFV), where CSF accumulates due to aqueductal and foraminal blockages [5,6], which may be discovered incidentally during imaging studies [7]. This typically occurs post-multiple shunt surgeries, potentially causing brainstem compression and neurological deficits [8,9]. Symptomatic TFV requires surgical intervention [10]. The choice of surgical approach remains subject to institutional resources and expertise, with endoscopic techniques emerging as the preferred modality in well-equipped centers [11]. Early recognition of TFV and intervention are critical to prevent irreversible neurological deficits. We present a case of TFV in a pediatric patient with a history of post-traumatic hydrocephalus, initially misdiagnosed as a space-occupying lesion.