Optic pathway gliomas in neurofibromatosis

Area of Science:

• Neuro-oncology
• Pediatric Neurology
• Medical Imaging

Background:

• Neurofibromatosis type 1 (NF-1) is a genetic disorder associated with an increased risk of developing tumors, including optic pathway gliomas.
• Optic pathway gliomas in children with NF-1 can present with diverse clinical and radiological features.
• Early and accurate diagnosis is crucial for managing these complex pediatric neuro-oncology cases.

Observation:

• Two pediatric cases of NF-1 with visual pathway gliomas are presented.
• Case 1: A 5-year-old girl with a pilocytic astrocytoma of the optic nerve, successfully treated with surgical excision and no recurrence after 7 years.
• Case 2: A 3-year-old boy with extensive glioma involving the optic nerve, chiasm, optic tracts, and basal ganglia, complicated by biventricular hydrocephalus. Magnetic resonance imaging (MRI) proved superior to computed tomography (CT) in delineating the posterior extent of the lesions.

Findings:

• Surgical resection was effective for a localized pilocytic astrocytoma in one patient.
• Magnetic resonance imaging (MRI) offers superior visualization of extensive optic pathway gliomas compared to computed tomography (CT).
• The extensive optic pathway involvement in the second patient, detected by MRI, might represent a dysplastic change characteristic of NF-1 rather than a neoplastic process.

Implications:

• This study highlights the importance of advanced imaging techniques like MRI in evaluating the full extent of optic pathway involvement in NF-1.
• The findings suggest that some MRI-detected optic pathway abnormalities in NF-1 may be developmental rather than neoplastic, potentially influencing treatment strategies.
• Further research is warranted to differentiate between neoplastic and dysplastic changes in NF-1 related optic pathway lesions.