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As noted in the discussion comments, the conventional use of the terms "Aplasia" and "Agenesis" often considers regard these as synonymous. However, proper definitions of these terms suggests a distinction that should be made in the terminology when included in the FSN>FSN.
- Aplasia - Defective development resulting in the absence of all or part of an organ or tissue.
- Agenesis - Absence of an organ due to nonappearance of its primordium in the embryo. (implies complete absence)
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It was found that by assigning the finding site of all aplasia concepts to "Part of X", incorrect subsumption occurred as Agenesis concepts did not classify correctly under Aplasia concepts of the same body structure, violating the definition of Aplasia as "all or part of". Thus, the following revision to the original proposed modeling guidance is submitted.
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ASSOCIATED MORPHOLOGY = 45486003 |Aplasia (morphologic abnormality)|or 890175002 |Transverse deficiency (morphologic abnormality)|
OCCURRENCE = 255399007 |Congenital (qualifier value)|
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