PULMONARY METASTASIS FROM HISTOLOGICALLY BENIGN GIANT-CELL TUMOR OF BONE - REPORT OF A CASE DIAGNOSED BY FINE-NEEDLE ASPIRATION CYTOLOGY

The cytologic features of pulmonary metastasis from a histologically b enign giant cell tumor of bone are reported. The patient had undergone curettage of a benign giant cell tumor of the humerus two years earli er. Aspiration of a pulmonary mass yielded a cellular population of mo nonuclear stromal cells admixed with a smaller population of binucleat e forms and occasional giant cells. Vacuolation and granulation of the stromal cells are cytologic features seen commonly in giant cell tumo rs of bone, but in the lung these features may deceptively mimic the a ppearance of pulmonary macrophages, Video thoracoscopic wedge resectio n of the metastatic lesion was performed subsequently.