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Craniopharyngioma and pineal region tumours
Craniopharyngioma in a child is a cystic, calcified suprasellar tumour that damages vision, growth and the hormonal axes; a pineal region tumour presents with Parinaud syndrome and hydrocephalus, and blood and CSF markers (AFP and βhCG) decide whether treatment can start without a biopsy.
Why it matters in the exam
Craniopharyngioma has two types: adamantinomatous — in children, cystic and calcified, with "machine oil" fluid, wet keratin and a CTNNB1 (beta-catenin) mutation; and papillary — in adults, solid and not calcified, with BRAF V600E that responds to targeted therapy. Presentation: headache, bitemporal hemianopia, short stature from growth hormone deficiency, diabetes insipidus and hydrocephalus. Treatment: resection when it can be done safely; when the tumour hugs the hypothalamus, partial resection and radiation are preferred to avoid severe hypothalamic obesity. Hormonal deficits and diabetes insipidus are expected after surgery, so the patient needs lifelong endocrine follow-up, including cortisol, thyroid hormone and growth hormone replacement as needed.
In the pineal region the commonest tumour is a germ cell tumour, led by germinoma. Pressure on the tectum causes Parinaud syndrome: upgaze palsy, convergence-retraction nystagmus, and dissociation between the pupillary light and near responses; pressure on the aqueduct causes hydrocephalus. Work-up: MRI of the brain and whole spine, and AFP and βhCG in blood and CSF. High markers — a non-germinomatous germ cell tumour — are treated with chemotherapy and radiation without biopsy. Negative markers — endoscopic biopsy, usually together with ETV in the same operation. Germinoma is highly sensitive to radiation and chemotherapy; a double lesion, suprasellar and pineal, fits germinoma, and its suprasellar component often presents with diabetes insipidus that appears before the tumour is clearly visible on imaging.
Key points
- Craniopharyngioma in a child — cystic, calcified, CTNNB1.
- In an adult — papillary, BRAF V600E.
- Parinaud — upgaze palsy from a pineal mass.
- High markers — treat without biopsy; negative — biopsy and ETV.
- Germinoma — radiation and chemotherapy, excellent prognosis.
Summary table
| Tumour | Age and feature | Marker or molecular | Treatment |
|---|---|---|---|
| Adamantinomatous craniopharyngioma | Children; cystic and calcified | CTNNB1 | Resection, or partial resection and radiation |
| Papillary craniopharyngioma | Adults; solid | BRAF V600E | Resection; BRAF and MEK inhibitors |
| Germinoma | Adolescent boys; pineal or suprasellar | Normal AFP, normal or slightly raised βhCG | Radiation and chemotherapy; excellent prognosis |
| Other germ cell tumour | High AFP or βhCG | Markers are diagnostic | Chemotherapy and radiation without biopsy |
| Pineoblastoma | Children; embryonal tumour | — | Resection, craniospinal radiation and chemotherapy |
Free exam questions
בדיקת AFP ו bHCG ב CSF נמצאה שלילית . מה השלב הבא הכי סביר בניהול הרפואי של המטופל? (the question as examined, in Hebrew)
- א. בדיקת המרקרים בדם
- ב. ניתוח לביופסית התהליך
- ג. ניתוח לכריתת התהליך
- ד. טיפול בקרינה
בניתוח בגישה אינפרה-טנטוריאלית סופרה-צרבלרית בתנוחת חצי ישיבה זיהית את בלוטת הפינאליס( pineal gland ) המסומנת בחץ צהוב . מה מנקז הוריד עליו מצביע החץ השחור? (the question as examined, in Hebrew)
- א. מנקז את הקלקריין סולקוס ואונה אוקסיפיטלית לווריד על שם גאלן
- ב. מנקז את הטנטוריום לווריד על שם גאלן
- ג. מנקז את הקרן הטמפורלית לאחר שעבר בציסטרנה אמביאנס לווריד על שם גאלן
- ד. חלק מווריד ה Labbe המנקז את האונה הטמפורלית
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Sources
- WHO Classification of Tumours: Central Nervous System Tumours, 5th edition (2021) — Craniopharyngiomas; Germ cell tumours; Pineal parenchymal tumours
- SIOP CNS GCT and COG germ cell tumour protocols, current protocols — Marker-based diagnosis and treatment
- Youmans and Winn Neurological Surgery, 8th edition (2022) — Craniopharyngioma; Pineal region tumours
Sources are given for further reading; the text is written afresh and not copied from them.
Reviewed by the Examqo AI Professor · 2026-11-06. The text may contain errors; when in doubt, check the source.