What is the most common tumor associated with medically refractory complex partial seizures in pediatric patients?

Dysembryoplastic neuroepithelial tumor (DNET) is the most common tumor linked to medically refractory complex partial seizures, particularly in children and young adults. It always involves the cortical gray matter and may present with a 'soap bubble' appearance on MRI, often with an exophytic extension beyond the cortical margin. Key diagnostic features include a well-circumscribed, non-enhancing lesion with a multinodular architecture. Clinically, DNETs are benign and have a good prognosis post-surgical resection. Common pitfalls include misdiagnosis as low-grade gliomas or gangliogliomas due to overlapping imaging features.