Pediatric Brain Tumors

01What Are These Pediatric Brain Tumors?

This page covers pediatric brain tumors that develop above the tentorium and along the brain's midline, distinct from the cerebellum and brainstem, which have their own pages (Pediatric Posterior Fossa and Diffuse Midline Glioma). Compared to those more tightly defined groups, this one is genuinely diverse: location alone can point toward several very different possibilities, from slow-growing gliomas that behave much like their adult counterparts to tumors that have almost nothing in common with typical adult brain tumors, in either biology or behavior.

What ties these tumors together isn't a shared cell of origin or a shared prognosis, but a shared anatomical neighborhood: structures like the optic pathways, the hypothalamic-pituitary axis, the pineal gland, and the ventricular system, each with functions a treatment plan has to protect. A tumor's exact location often says as much about the likely diagnosis, and the level of surgical risk involved, as its appearance on imaging does.

Because the tumor types here differ so much in biology and treatment, working out which one is actually present, largely through imaging, tumor markers, and sometimes a biopsy, is the first and most important step. What happens next follows from that answer far more than from any single rule that applies across the whole group.

02Where They Occur

03Symptoms

Symptoms depend heavily on location. Suprasellar and pineal tumors often present with vision changes, hormonal problems, or hydrocephalus before anything else; hemispheric tumors are more likely to cause seizures or focal weakness. Across the group, some signs recur often enough to be worth knowing.

• Headaches, especially if worse in the morning or with vomiting
• Vision changes, such as blurred or double vision, or loss of visual field
• Hormonal or growth changes, particularly with suprasellar tumors
• Seizures
• Signs of hydrocephalus: headache, vomiting, lethargy, and in infants a rapidly increasing head size

04Diagnosis

Contrast-enhanced MRI is the starting point for every tumor in this group and usually narrows the possibilities considerably based on location and appearance. For pineal and suprasellar masses specifically, blood and cerebrospinal fluid tumor markers (AFP, beta-hCG) are checked early; a markedly elevated result can be diagnostic for a germ cell tumor on its own, sometimes avoiding the need for a biopsy altogether. When the diagnosis remains unclear, a biopsy or resection provides the tissue needed for a definitive answer.

05Treatment Options — Overview

Because this group spans such different tumor biology, there's no single treatment pathway that applies across all of it. What surgery can safely accomplish, and what should follow it, depends on the specific diagnosis.

Hemispheric gliomas are approached much like adult gliomas: maximal safe resection, then observation or adjuvant therapy based on grade. Optic pathway and hypothalamic gliomas are usually treated with chemotherapy first, since surgery close to the optic apparatus and hypothalamus carries real risk to vision and hormonal function. Germinomas, once confirmed by markers or biopsy, respond so well to radiotherapy and chemotherapy that aggressive surgical resection usually isn't needed. Craniopharyngioma, choroid plexus tumors, and embryonal tumors generally do require surgical removal, with adjuvant therapy added afterward based on how much tumor was left behind and the pathology result.

Hydrocephalus is common with tumors in this region, particularly pineal and intraventricular tumors, and is often addressed with an endoscopic third ventriculostomy, either before or during the main procedure.