Pediatric brain tumors often begin with nonspecific symptoms—some physical, some behavioral—that can be attributed to internal medicine or psychiatric differential diagnoses, thereby presenting typical diagnostic pitfalls. Clinical case examples from the past and present—involving behavioral changes, episodic movement disorders, persistent headaches, or supposedly functional symptoms—demonstrate how quickly such presentations can be misinterpreted. Reliable classification requires combining basic clinical diagnostics—systematic follow-up, assessment of symptom persistence, and neurological examination—with interdisciplinary knowledge from neurology, psychiatry, and internal medicine. Modern imaging and molecular techniques increase diagnostic precision; however, they do not replace conventional clinical diagnostics but rather complement them, as innovative techniques should always build upon a careful initial clinical evaluation.
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