interestingly, we found that ap diameter greater than 2 cm and mri indicating deep myometrial invasion had comparable accuracy (sensitivity, specificity) for identification of deep myometrial invasion at surgical staging 79 (66, 86) and 74 (70, 77), respectively, however, with significantly better specificity for ap diameter greater than 2 cm (86 vs 77 p 0.). University of wisconsin school of medicine and public health. Could someone give me a laymans explanation of these measurements-- 1. Also, could someone explain the following mri report in plain english for me?----- brain again noted is the heterogeneously enhancing mass in the left frontal lobe which measures approximately 18x 20 x. Barrel chest - ap diameter compared to transverse diameter is 11 c. Pigeon breast (pecus carinatum) - ap diameter is increased d. Start studying chapter 3 objectives, ap, pathology of breast. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Codes for chest xrays are simplified nine codes are deleted and replaced by four new. 71020 radiologic examination, chest, 2 views, frontal and lateral 2018 radiology.