Which pediatric brain tumor is associated with the optic pathway and commonly presents with decreased vision and proptosis?

• A. Craniopharyngioma
• B. Pilocytic astrocytoma
• C. Optic pathway glioma
• D. Medulloblastoma

Answer: (C)

This item tests recognizing a tumor that directly involves the visual pathway in children and presents with vision decline and eye protrusion. An optic pathway glioma is a low‑grade astrocytoma that grows along the optic nerve, chiasm, or tract. Because it sits in the visual system, it commonly causes decreased vision in the affected eye and can lead to proptosis as the tumor enlarges. This tumor is especially associated with neurofibromatosis type 1, though it can occur without NF1 as well, and the presentation you’d expect matches the optic pathway’s role in vision.

Other tumors listed tend to present with different patterns. A craniopharyngioma is usually suprasellar and more often brings endocrine issues (like growth and hormonal problems) and variable visual symptoms from chiasm compression. Medulloblastoma arises in the cerebellum and typically presents with headaches, vomiting, and balance problems due to increased intracranial pressure. Pilocytic astrocytoma most often involves the cerebellum as well, though it can appear along the optic pathway; however, the combination of optic involvement with decreased vision and proptosis most directly points to an optic pathway glioma.