Pediatric renovascular hypertension represents a clinically significant and diagnostically complex condition associated with substantial cardiovascular and renal morbidity. Among the uncommon but critical etiologies, fibromuscular dysplasia (FMD) and Takayasu arteritis (TA) frequently present overlapping radiological and clinical manifestations, thereby complicating differential diagnosis and therapeutic decision-making. This research and review article critically investigates the distinguishing characteristics between FMD and TA in pediatric patients presenting with renovascular hypertension and severe biochemical disturbances such as hypokalemia. The study synthesizes evidence from established literature concerning epidemiology, pathophysiology, vascular imaging, inflammatory biomarkers, and therapeutic outcomes following percutaneous transluminal renal angioplasty and renal revascularization. The article further evaluates the implications of inflammatory vascular remodeling, stenotic lesion morphology, and long-term vascular prognosis in both diseases. Comparative analysis reveals that although FMD is generally non-inflammatory and segmental in vascular involvement, TA demonstrates systemic inflammatory vasculitis with progressive arterial wall damage. However, substantial overlap in clinical presentation often necessitates advanced imaging and multidisciplinary assessment. Endovascular intervention remains a significant therapeutic modality for renovascular restoration, though procedural outcomes vary depending on disease activity, arterial pathology, and restenosis potential. The present investigation emphasizes the importance of early diagnostic discrimination to optimize pediatric vascular outcomes and minimize irreversible renal injury. Furthermore, this article highlights current limitations in diagnostic standardization and long-term pediatric management protocols while reinforcing the clinical significance of individualized revascularization strategies. An Investigative Approach to Fibromuscular Dysplasia Versus Takayasu Arteritis in Pediatric Renovascular Hypertension Successfully Treated With Percutaneous Renal Revascularization provides a clinically relevant framework for improving diagnostic precision and intervention planning in pediatric renovascular disease.