In this retrospective observational study involving 176 patients and 271 biopsies, the
histologic differentiation in superficial endometriosis, deeply infiltrating endometriosis, and
ovarian endometriomas was evaluated according to a previously proposed classification
system. Results showed a predominance of the undifferentiated glandular pattern (33.5%)
and mixed glandular pattern (46.9%) in deeply infiltrating endometriosis lesions, whereas
the well-differentiated glandular pattern (41.8%) was most frequently seen in superficial …