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Hi all,

We discussed this concept on the last call, and fed back that it had been retired as ambiguous in the International Release. The discussion suggested that the concept be reactivated. However, I have had the following feedback from the authors and Head of Terminology.

The term "mature cystic teratoma" does not appear in the current version ICD-0, and it is felt therefore, that the term is outdated. Could the GP/FP SIG provide justification for the reactivation of the concept.

Look forward to your replies,

Kind regards


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  1. This is what I found in Wikipedia:  The words "teratoma" and "mature teratoma" both have been used to refer to a benign growth, while the word "teratoma" may also refer to "immature teratoma", a cancerous growth. Avoiding misunderstanding due to such polysemy is part of why tumor nomenclature changes over decades. The nomenclatural changes are voluntary, based on scientists agreeing or debating in the literature regarding what to call particular neoplastic entities (types of tumors).

    The term 'mature cystic teratoma' produced a number of hits with Google.

    If a user does a search in SCT for 'mature cystic teratoma' will they get nothing or will if be found and there is some indication that this has been replaced with something that the knowledgeable ones say is appropriate for usage today?

    I think that when users search for an out of date term that they be pointed to what is currently preferred.




  2. Depends on the browser Ray!

    There are four inactive concepts to be found with descriptions containing the exact search expression, as typed:

    72277008 Dermoid cyst (morphologic abnormality)
                     SYN:Mature cystic teratoma

    119424003 Dermoid cyst of ovary (disorder)
                     SYN Mature cystic teratoma of ovary

    439575008 Mature cystic teratoma

    439023008 Mature cystic teratoma of testis (disorder) one active concept that possesses all three tokens within the search expression, but scattered across its set of descriptions:

    42717009 Teratoma, benign (morphologic abnormality)
                     SYN:Cystic teratoma
                     SYN:Mature teratoma

    The four inactive 'mature cystic teratoma' concepts have historical relationships that pointing at a range of potential active concept substitutes:

    72277008|MAY BE A|=123151001|Dermoid cyst|,
    72277008|MAY BE A|=42717009|Teratoma, benign|
    119424003|MAY BE A|=119423009|Benign teratoma of ovary|
    439575008|MAY BE A|=402878003|Germ cell tumor|,
    439575008|MAY BE A|=20376005|Benign neoplastic disease|,
    439575008|MAY BE A|=42717009|Teratoma, benign|
    439023008|MAY BE A|=447799001|Benign teratoma of testis| a 'good' browser should find the 4 inactive concepts above but return the 6 active ones implied by them plus the solitary already active one. But all 7 active candidates so returned would still correspond only to benign disease; the possible 'malignant' interpretation of teratoma isn't apparent; it could, however, be argued that no possible malignant interpretation applies when the teratoma is also explicitly 'mature' and/or 'cystic'.

    Meanwhile, there is :

    189847002 Malignant teratoma                 (retired inactive)
                 SAME AS|=19467007|Teratoma, malignant|
    19467007 Teratoma, malignant                 (current active)
                     SYN Immature teratoma



  3. It seems that the term was previously labled ambiguous but is now outdated in spite of still being in SNOMED CT attatched to locations. We have to be carful with abitary deletion of terms as "outdated" which is context and country dependent. The discipline of general practice may continue to use terms which have reduced in frequency in other disciplines. We need to cope with the semantic variance betweeen disciplines and countries, even within the English speaking countries. I suggest we should retain the term.


    1. I agree with Graeme here,


    2. It has been my understanding that when a term becomes outdated that it can still be searched on but when the search results are displayed that there would be an indication of what the preferred term is.


      1. The problem here Ray is that there is no semantic equivalent to the term IHTSDO are proposing to delete.