What is a 4mm brain tumor considered extra small or small or medium or large in size for a tumor?

A 4mm brain tumor is generally considered extra small. Tumors are often classified based on their size, with sizes typically categorized as extra small (less than 1 cm), small (1-2 cm), medium (2-4 cm), and large (greater than 4 cm). Therefore, a 4mm tumor falls into the extra small category, as it is less than 1 cm in diameter.