Figure 2

Parsing result. a) The phrase "brainstem hypoplasia" parsed. The token "brainstem" was recognized by MetaMap as UMLS term (CUI C0006121) of semantic type "Body Part, Organ, or Organ Component" and the token "hypoplasia" was identified as CUI C0243069 of semantic type "Pathologic Function". b) Parse tree of the phrase "mri shows brainstem hypoplasia", same concepts were recognized as in (a), "mri" is marked as a noun and "shows" is marked as a noun as well since we view the phrases as noun phrases without verbs. c) Parse tree of the phrase "hypoplasia of the brainstem", the entire phrase is reduced by MetaMap to the two concepts identified in (a), only in reversed order.