Light micrograph of a carcinoid tumour. Carcinoid tumour is a type of neuroendocrine tumour that can form in various body sites including the gastrointestinal tract and lungs. Carcinoid tumour is characterized by cells with oval to round nuclei (darker blue) and a speckled chromatin pattern (finely granular texture inside the nuclei), sometimes nicknamed ?œsalt and pepper chromatin?? A few red blood cells (bright red) are also seen here amongst the tumour cells. Haematoxylin and eosin stained tissue section. Magnification: 400x when printed at 10cm.