Mullerian adenosarcomas are rare mixed tumors of low malignant potential that occur mainly in the uterus and also in extrauterine locations. Microscopically, they may be difficult to distinguish from adenofibromas.
References
Gallardo A, Prat J. Mullerian Adenosarcoma: A Clinicopathologic and Immunohistochemical Study of 55 Cases Challenging the Existence of Adenofibroma. Am J Surg Pathol. 2008 Oct 20. PMID: 18941402