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Figure 4: Computed tomography axial slices at different levels show a retrorectal mature cystic teratoma with focal adenocarcinoma (case No. 20). Several solid nodules locate at the caudal end of the multilocular lesion, which might be the places where the malignant components harbour (white arrows). The black arrow indicates a 'tooth' in the mature teratoma

Figure 4: Computed tomography axial slices at different levels show a retrorectal mature cystic teratoma with focal adenocarcinoma (case No. 20). Several solid nodules locate at the caudal end of the multilocular lesion, which might be the places where the malignant components harbour (white arrows). The black arrow indicates a 'tooth' in the mature teratoma