Evaluation of pituitary gland anatomy and histopathologic findings in clinically normal horses and horses and ponies with pituitary pars intermedia adenoma - Van der Kolk, J H; Heinrichs, M; van Amerongen, J D; Stooker, R C; in de Wal, L J; van den Ingh, T S (Am J Vet Res, 2004)