Psammoma bodies are seen in all except -

Psammoma bodies represent a process of dystrophic calcification. Single necrotic may constitute seed crystals that become encrusted by the mineral deposits. The progressive acquisition of outer layers may create lamellated configurations, called psammoma bodies because of their resemblance to grains of sand. Psammoma bodies are seen in : Papillary cancer of the thyroid Meningioma Papillary serous cystadenocarcinoma of the ovary