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Carcinoid : Thymus

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Comments:
This example of thymic carcinoid shows a spindle cell pattern. Thymic carcinoids are malignant tumors that can invade locally and show distant metastases. They can occur as a component of multiple endocrine neoplasia type I or IIa syndromes. The main distinguishing features from thymoma are : lack of lobulated architecture of thymoma; high vascularity; lack of lymphocytes and perivascular spaces of thymoma.

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