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The problem with the way TU is set up now, which is originally designed for tumor identification and response evaluation, and you only care about "already identified tumors", is that it only allows the creation of an a positive record. It doesn't allow the creation of a "pertinent negative" record. If I were to model case 2 in TU the way TU is designed now, I would lose the ability to represent the negative record for the Thoracic Region as shown above because an aneurysm is not identified in this region. Because when a large AAA is found, the chance of a TAA (or an aneurysm developed elsewhere) is high (the reverse holds true as well), in the presence of a diagnosed large AAA or TAA, it is recommended to also screen for the other. A TAA as is synchronous if diagnosed within 2 years from the diagnosis of an AAA. All TAAs diagnosed at a later date were considered metachronous and must have had prior chest imaging that did not show the presence of TAA.
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