P-66 Primary Thyroid Lymphoma mimicking Riedel Thyroiditis
Abstract
Abstract Introduction Although Riedel's thyroiditis and primary thyroid lymphoma are rare diseases of the thyroid, they should be considered in the differential diagnosis of patients presenting with a neck mass. We report here the case who was followed up with the diagnosis of Riedel's thyroiditis and later diagnosed with lymphoma. Clinical Case A 67-year-old female presented with swelling in the neck, pain and shortness of breath. Thyroid ultrasound demonstrated enlarged thyroid gland, heterogeneous parenchyma, irregular contours, thin septations and pseudonodule formations. Laboratory tests revealed, TSH 4.17 mIU/L, fT4 1.37 ng/dl, anti TPO 147 IU/mL, sedimentation 13mm/h, and CRP of 5.5 mg/dl. In neck CT, an 8*4 cm hypodense mass infiltrating both thyroid lobes, extending anteriorly and superiorly, surrounding the trachea by 270 degrees, was detected. Follicle cells were seen in the fine needle aspiration biopsy, but no neoplasm was found. In PET-CT, increased FDG uptake was detected in the thyroid parenchyma (SUVmax: 22.89) and in one subcentimetric lymph node (SUVmax: 3.5) in the right cervical region. No neoplasm was found in the tru-cut biopsy and the biopsy was reported as granulomatous thyroiditis. When her current complaints and physical examination findings were evaluated together, methylprednisolone was started, considering Riedel's thyroiditis. In the follow-up examination, the thyroid size of the patient decreased significantly and the steroid dose was reduced.…
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