OSSIFYING FIBROMYXOID TUMOR OF THE NECK CLINICALLY MIMICKING A PRIMARY NEOPLASM OF THE THYROID-GLAND

We present a 50-year-old male patient with an ossifying fibromyxoid tu mour (OFMT) of the prethyroidal soft parts infiltrating the thyroid gl and in coincidence with recurrent goitre, 20 years after strumectomy. The tumour, initially misdiagnosed as thyroid carcinoma and malignant schwannoma respectively, was histologically composed of typical solid cell-formations and shelly-like mature bone at the periphery. In addit ion, in the tissue adjacent to the tumour some foreign body granulomas with suture material and small proliferating nerves were present as a residual of the preceding strumectomy. We regard this finding as an i ndication of nerve sheat origin of OFMT. Follow up of 3 years after to tal thyroidectomy and local irradiation shows the patient free of recu rrent and metastatic disease.