Table 4.

Examples of false positives (or invalid missing IS-A relations) and the existing IS-A relations causing the false positives

Subtype concept	Supertype concept	Source terminology	Existing IS-A relation(s) causing the false positive
Benign neoplasm of false vocal cord (disorder)	Benign neoplasm of vocal cord (disorder)	SNOMEDCT_US	“false vocal cord” IS-A “vocal cord” in the NCI Thesaurus
Deficiency of lysophospholipase (disorder)	Deficiency of triacylglycerol lipase (disorder)	SNOMEDCT_US	“lysophospholipase” IS-A “phospholipase” IS-A “triacylglycerol lipase” in the SNOMEDCT_US
Abscess of thumb of left hand (disorder)	Abscess of finger of left hand (disorder)	SNOMEDCT_US	“thumb” IS-A “finger” in the UWDA and FMA
Calculus of gallbladder with acute and chronic cholecystitis (disorder)	Calculus of gallbladder with acute cholecystitis (disorder)	SNOMEDCT_US	“acute and chronic cholecystitis” IS-A “acute cholecystitis” in the MEDCIN
cellular response to beta-carotene	cellular response to vitamin A	GO	“beta-carotene” IS-A “vitamin A” in the SNOMEDCT_US
caprolactam metabolic process	propylene metabolic process	GO	“caprolactam” IS-A “propylene” in the SNOMEDCT_US
cellular response to ammonium ion	cellular response to ammonia	GO	“ammonium ion” IS-A “ammonia” in the SNOMEDCT_US

GO: Gene Ontology; SNOMEDCT_US: SNOMED CT (U.S. version).