This miliary pattern in CT scan can occur due to spread from?

Miliary pulmonary disease Miliary systemic disease It occurs in primary progressive pulmonary TB when organisms in the draining lymph nodes erode into the pulmonary aeries. This distributes the infection to both lung fields. Once the infection in the lung reaches the pulmonary vein the bacteria can reach the left side hea. Subsequently, they can seed organs like liver and spleen