C cell

(1) a cell of the pancreatic islets of the guinea pig; SYN: gamma cell of pancreas.medullary carcinoma of thyroid. (2) calcitonin-secreting round or spindle shaped follicular thyroid cell; ultrastructurally contains numerous 60-550 nm neuroendocrine granules; best identified immunohistochemically with antibodies to calcitonin. SYN: light cells of thyroid, parafollicular cells.