Thyroid Cancer: Pathogenesis, Clinicopathology, Diagnosis, and Management

Thyroid cancer is the most common endocrine malignancy, with incidence rising steadily worldwide. Although most cases are differentiated thyroid carcinomas with excellent prognosis, a small subset, such as anaplastic thyroid cancer, demonstrates aggressive behavior and poor survival outcomes. Recent decades have witnessed a transformation in thyroid cancer diagnostics and management, driven by improvements in high-resolution ultrasound, fine-needle aspiration biopsy, molecular profiling, and standardized risk stratification systems such as the Thyroid Imaging Reporting and Data System. Despite these advances, overdiagnosis and overtreatment remain key clinical challenges. Accurate risk stratification and management strategies are critical, especially for distinguishing indolent nodules from aggressive subtypes. This review provides a comprehensive overview of thyroid cancer pathogenesis, clinicopathological classification, diagnostic approaches, and evolving therapeutic strategies, ranging from active surveillance to targeted and immunotherapy-based treatments. By integrating molecular diagnostics with conventional parameters, the article underscores how precision medicine can reduce treatment burden, improve outcomes, and guide personalized care. This review offers valuable insight into the biological complexity of thyroid cancer and highlights the need for continued refinement of diagnostic criteria and therapeutic frameworks in clinical practice.