BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY
Gross specimen of a testis with teratoma, a malignant (cancerous) tumor arising from the germ (sex) cells. Cystic spaces (dark brown) are seen within the testicle. These areas of solid tissue have replaced lobules that are normally filled with seminiferous tubules. Because germ cells are pluripotent, that is they can differentiate into any cell type, teratomas contain a mixture of tissues. Hair and teeth may grow in the tumor. Treatment is with chemotherapy or removal of the testicle.
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