Extramedullary hematopoiesis involving the thyroid: Fine-needle aspiration features and literature review

Conclusions Thyroidal EMH is an extremely uncommon finding. Clinical and sonographic features are nonspecific. Thyroid EMH is usually an incidental finding, most likely related to mature osseous metaplasia. An occasional association with hematologic disease has been reported, however. To date, there does not appear to be any association with thyroid malignancy and surgery is typically not indicated. Therefore, recognition at the time of FNA is essential.
Source: Journal of the American Society of Cytopathology - Category: Cytology Source Type: research