![](https://webarchive.library.unt.edu/eot2008/20090514052239im_/http://www.cancer.gov/images/spacer.gif) |
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(uh-KULT PRY-mayr-ee TOO-mer)
![](https://webarchive.library.unt.edu/eot2008/20090514052239im_/http://www.cancer.gov/images/spacer.gif)
| Cancer in which the site of the primary (original) tumor cannot be found. Most metastases from occult primary tumors are found in the head and neck. |
Previous Definitions: | observation, observational study, obsessive-compulsive disorder, obstruction, obtundation | Next Definitions: | occult stage non-small cell lung cancer, occupational therapist, OCT, octreotide, octreotide scan |
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![](https://webarchive.library.unt.edu/eot2008/20090514052239im_/http://www.cancer.gov/images/spacer.gif) |