Source:http://linkedlifedata.com/resource/umls/id/C1305231
NCI: A recess, cavity, or channel. (NCI),NCI: 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.,NCI: A recess, cavity, or channel.