Demographics

• Females>males
• caucasian and asians more common

Histopathology

• Papillary Carcinoma:

Follicular Carcinoma

• 10%
• aged women
• small primary
• early spread (haematogenous)
• variable morphology, ranging from small or medium sized follicles containing colloid to trabecular or solid growth patterns.

Medullary carcinoma:

• 5%
• abnormal growth of parafollicular C cells Calcitonin affected