Histiocytic sarcoma
Encyclopedia
Histiocytic sarcoma is a tumor derived from histiocyte
Histiocyte
A histiocyte is a cell that is part of the mononuclear phagocyte system . The mononuclear phagocytic system is part of the organism's immune system...

s. The tumor is often positive for CD163
CD163
CD163 is a human protein encoded by the gene....

 and can appear in the thyroid
Thyroid
The thyroid gland or simply, the thyroid , in vertebrate anatomy, is one of the largest endocrine glands. The thyroid gland is found in the neck, below the thyroid cartilage...

.
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