ABSTRACT
Thyrotoxicosis affects hematopoiesis in several ways and thioamides may cause myelosuppression. We report a case of febrile neutropenia in a patient with hyperthyroidism who was using propylthiouracil for nearly 20 years for the treatment of toxic multinodular goitre. After surgery, the patient was euthyroid and neutropenia resolved. Postoperative pathology was evaluated as micropapillary thyroid carcinoma.