For reference, the embedded MP definition seems to indicate viscera

[Term]
id: MP:0008853
name: decreased abdominal adipose tissue amount
namespace: MPheno.ontology
def: "reduction in amount of adipose tissue associated with internal organs" [MGI:csmith]
synonym: "reduced abdominal adipose tissue amount" EXACT []
is_a: MP:0001781  ! abnormal white adipose tissue amount

The ontology has (implicitly) subcutaneous and abdominal adipose but not the intersection of the two:

My inclination would be go with ugly but unambiguous terms:

• adipose tissue of abdominal region
  • visceral(?) abdominal adipose tissue OR abdominal organ adipose tissue
  • subcutaneous adipose tissue of abdominal region

This seems a bit odd though. The last term may not be of much use for annotation?

This sounds ok to me. So would be something like:

. UBERON:0007808 and CALOHA:TS-0002
“adipose tissue of abdominal region” (synonyms: "abdominal adipose tissue", “abdominal fat”)
def: Fatty tissue in the region of the ABDOMEN. It includes the ABDOMINAL SUBCUTANEOUS FAT and the INTRA-ABDOMINAL FAT (from MeSH D050153)

     -> UBERON:XXXXXXX and CALOHA:TS-XXXX
“visceral adipose tissue of abdominal region” 
      (synonyms: “visceral abdominal fat”, “visceral abdominal  adipose tissue”, “intra-abdominal fat”, “intra-abdominal adipose tissue”

      -> UBERON:YYYYYYY and CALOHA:TS-YYYY
“subcutaneous adipose tissue of abdominal region” 
      (synonyms: “subcutaneous fat of abdominal region”, “abdominal subcutaneous fat”, “abdominal subcutaneous adipose tissue”

I did not included “abdominal organ adipose tissue” because when google "abdominal organ adipose tissue" found 0 results, so not sure it is used, but if you think it is, go ahead.

I think that “subcutaneous adipose tissue of abdominal region” may be useful for annotations because studies showing that the different contribution of “subcutaneous adipose tissue of abdominal region” and “visceral adipose tissue of abdominal region” to obesity

Adipose tissue is one of many examples where the mouse differs from humans. Paula's examples are all from papers describing human adipose tissue. I have it a bit confounded and skewed towards mouse descriptions in the MP, but I tried to be purposefully vague at the higher levels.

For example, rodents do not have semi-solid visceral fat packed around abdominal internal organs and in the peritoneal cavity as humans do- but they do have four main abdominal encapsulated fat pad depots that have a more cohesive appearance (mice never get a "pot-belly"). While mice do have some subcutaneous fat in skin, especially abdomen, it is not in the same proportion or distribution as in humans, who require an overall thicker layer for insulation from heat/cold and for energy storage. I'm not sure about adipose tissue in other animal species, although I expect that it is well known in livestock.

So at least in the mouse/rat, if you discuss "abdominal fat" you are almost always referring to the abdominal fat pads… visceral fat doesn't exist and subcutaneous fat is generally considered separate. I do have a term "decreased abdominal adipose tissue amount [MP:0008853]" that I should reconsider. There are only a handful of MGI mouse annotations and the few I checked are really about the fat pads, for which I have a similar term ("decreased abdominal fat pad weight" [MP:0009287]).

I'm not sure how best to make subterms, but this much is fine:
UBERON:0007808
“adipose tissue of abdominal region” (synonyms: "abdominal adipose tissue", “abdominal fat”)
def: Fatty tissue in the region of the ABDOMEN.

The rest of the definition from above gets more human-centric. The two proposed subterms are okay for human annotations but we could not use the “visceral adipose tissue of abdominal region” in the rodent community as it implies visceral fat.

Thanks Cindy. So would be:

UBERON:0007808 and CALOHA:TS-0002
“adipose tissue of abdominal region” (synonyms: "abdominal adipose tissue", “abdominal fat”)
def: Fatty tissue in the region of the abdomen.

Only in Caloha (?):

CALOHA:TS-XXXX
“visceral adipose tissue of abdominal region” (synonyms: “visceral abdominal fat”, “visceral abdominal adipose tissue”, “intra-abdominal fat”, “intra-abdominal adipose tissue”

CALOHA:TS-YYYY
“subcutaneous adipose tissue of abdominal region” (synonyms: “subcutaneous fat of abdominal region”, abdominal subcutaneous fat”, “abdominal subcutaneous adipose tissue”

With the changes above, the existing uberon class was retained as a broad grouping class. Subclasses include visceral abdominal, subcutaneous and encapsulated fat depots.

These will be in the next release.

I think there's still some work to be done in this area - not quite happy with panniculus adiposus and related structures