Sacrococcygeal Chordoma with Sarcomatous Features (Spindle Cell Metaplasia)

Abstract

A 62-year-old man had an enlarging painful sacrococcygeal mass for three months and constipation for two weeks. Aspirate from the lesion contained some physaliphorous cells and pleomorphic, undifferentiated tumor cells. The excised chordoma contained many areas infiltrated by anaplastic spindle cells. Only the sarcomatous component was observed in the pelvic recurrence and in the pulmonary and hepatic metastases two months later.