NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,863 terms related to cancer and medicine.

Browse the dictionary by selecting a letter of the alphabet or by entering a cancer-related word or phrase in the search box.

extracranial germ cell tumor
(EK-struh-KRAY-nee-ul jerm sel TOO-mer)
A rare cancer that forms in germ cells in the testicle or ovary, or in germ cells that have traveled to areas of the body other than the brain (such as the chest, abdomen, or tailbone). Germ cells are reproductive cells that develop into sperm in males and eggs in females.

EnlargeExtracranial germ cell tumor; drawing shows parts of the body where extracranial germ cell tumors may form, including the mediastinum (the area between the lungs), retroperitoneum (the area behind the abdominal organs), sacrum, coccyx, testicles (in males), and ovaries (in females). Also shown are the heart and peritoneum.

Extracranial germ cell tumors form in parts of the body other than the brain. This includes the testicles, ovaries, sacrum (lower part of the spine), coccyx (tailbone), mediastinum (area between the lungs), and retroperitoneum (the back wall of the abdomen).