Carcinoid of Thymus : (AE1/AE3)
Comments:
Immunohistochemistry: Thymic carcinoids are immunoreactive for keratins (AE1/AE3 (shown here), CAM5.2; often in a dot-like pattern) and neuroendocrine markers such as synaptophysin, chromogranin, and NCAM/CD56. They may also show focal positivity for hormones such as ACTH, hCG, somatostatin, and calcitonin. TTF-1 is not expressed.