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Home >Information for Patients > Dictionary Index

Dictionary of Cancer Terms

View in Spanish: Seno

Sinus (SY-nus)
A cavity, space, or channel in the body. Examples include hollow spaces in the bones at the front of the skull, and channels for blood and lymph. Sinuses may also be found in the heart, brain, and other organs.



 
 
Source: National Cancer Institute Dictionary of Cancer Terms, available at www.cancer.gov/dictionary.