| umls-concept:C3203348 | skos:definition | NCI: The upper part of the gastrointestinal tract that includes the esophagus, stomach, and duodenum. (NCI),MSH: The segment of GASTROINTESTINAL TRACT that includes the ESOPHAGUS; the STOMACH; and the DUODENUM.,NCI: The upper part of the gastrointestinal tract that includes the esophagus, stomach, and duodenum. | lld:umls |
