The problem of unexplained upper gastrointestinal bleeding.
D004379:Duodenal Neoplasms; D004386:Duodenum; D006471:Gastrointestinal Hemorrhage / Q000209:etiology*; D006470:Hemorrhage; D006801:Humans; D007889:Leiomyoma / Q000150:complications*; D009369:Neoplasms
DUODENUM/neoplasms; HEMORRHAGE, GASTROINTESTINAL/etiology; LEIOMYOMA/complications