The market taxonomy by type distinguishes four diagnostic modalities: Imaging‑based, Molecular, Liquid Biopsy, and Histopathology. Imaging‑based diagnostics, including MRI, CT, and PET, dominate the market owing to their established role in anatomical and functional assessment. Molecular diagnostics encompass DNA sequencing, RNA expression profiling, and epigenetic markers, contributing incremental value as precision oncology expands. Liquid Biopsy leverages blood‑derived circulating tumor cells, cell‑free DNA, and exosomes, offering minimally invasive surveillance and increasingly influencing the Treatment Monitoring and Recurrence Detection applications. Histopathology remains essential for definitive diagnosis through tissue biopsies, immunohistochemistry, and digital pathology, sustaining a stable niche despite the shift toward non‑invasive methods. Each type’s contribution to market size is determined by its clinical utility, cost‑effectiveness, and integration into treatment algorithms, together forming a comprehensive diagnostic ecosystem for brain cancer.