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. 2022 Nov 11;307(1):5–19. doi: 10.1007/s00404-022-06766-z

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Fig. 7 — Sonographic image of an irregular deep endometriosis nodule in the rectal anterior wall (length 1.8 cm = #Enzian(u)C2). The hypodense area (A) represents the marked widening of the muscle layer due to a deep endometriosis nodule, accompanied by fibrosis or myohyperplasia of the layer. The normal pattern of the muscle layer is visible in the caudal direction and the parts of the posterior wall (B). The lesion lies directly underneath the mucosa (full thickness defect) (C)