The idea that assessment is intrinsic to effective instruction is traced from early experiments in the individualization of learning through the work of Benjamin Bloom to reviews of the impact of feedback on learners in classrooms.
Incidental hypervascular lesions are also very common findings in liver imaging. It is important to differentiate between 'touch' and 'don't touch' lesions. Benign 'don't touch' hypervascular tumors include hemangioma, FNH and small adenomas.
A cerebrovascular accident caused by a cerebral thrombosis is the result of a build-up of plaque and inflammation in the arteries, called atherosclerosis. This process narrows the brain arteries and lowers the amount of oxygen-rich blood that reaches the brain tissue.