Light micrograph of thyroidisation of kidney tubules. Thyroidisation refers to a pattern of tubule atrophy in kidneys which makes them resemble thyroid follicles. The tubules are round with a thin border and central pink hyaline material (pink circles). At the bottom of the image is a portion of a blood vessel wall (horizontal pink line). Haematoxylin and eosin stained tissue section. Magnification: 200x when printed at 10 centimetres.