Benign müllerian lymph node inclusions. An unusual case with implications for pathogenesis and review of the literature.

Endosalpingiosis with psammoma bodies within an intramammary lymph node presented as microcalcifications on mammography in the right breast of a 64-year-old woman. The radiographic differential diagnosis included primary breast carcinoma. The histologic differential diagnosis included metastatic papillary carcinoma, particularly of thyroid origin. To our knowledge, this is the first reported case of endosalpingiosis occurring above the diaphragm. The unusual location of these inclusions has relevant implications concerning their pathogenesis. Moreover, it is important for pathologists to be aware that endosalpingiosis may occur and mimic carcinoma at sites distant from the female pelvis.