The occurrence of bone in endometrial stroma of a 31-year-old nulligravida who attended the outpatient clinic for infertility (Ziekenhuis Annadal, Department of Obstetrics and Gynaecology, State University Limburg, The Netherlands) is described. A review of the literature is given and the theories about the etiology are discussed. It seems apparent that in the described patient, only a locally acting cause can explain the findings.
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