Complex Treatment of A Rare Non-Germinomatous Germ Cell Optic-Chiasmal Brain Tumor In An Adolescent Child-A Clinical Case With Literature Review

Non-germ cell tumours (NGCTs) are rare intracranial neoplasms occurring in adolescents and young adults. A multidisciplinary team including a neurosurgeon, oncologist, radiologist, pathohistologist, ophthalmologist, pediatric oncohematologist, neurologist and endocrinologist is required for diagnosis and treatment. We present a rarely diagnosed optic-chiasmal non-germinomatous germ cell tumour (NGGCT) in a 16-year-old boy, accompanied by pituitary insufficiency (diabetes insipidus and central hypothyroidism) and severely impaired vision bilaterally. The immunohistochemistry (IHC) of the tumor biopsy, as well as the level of tumor markers (human chorionic gonadotropin and alpha-fetoprotein) in the serum and cerebrospinal fluid are significant factors for determining the diagnosis-cranial GCT or cranial NGCT. Because the tumor was inoperable, we performed 3 courses of neoadjuvant chemotherapy followed by definitive radiotherapy to a total tumor dose of 55 Gy. In such rare childhood brain tumors, complex treatment achieves long-term local tumor control, requiring long-term monitoring by an ophthalmologist and endocrinologist.