Mesonephric-like adenocarcinoma of the uterine corpus with focal sarcomatous differentiation: A case report.

Kanao S, Urano M, Fujita K, Utsumi F, Sugihara K, Shibata K
Fujita medical journal · 2025 · doi:10.20407/fmj.2024-017 · PMID:39896229 · PMC11782939
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Abstract

Mesonephric-like adenocarcinoma of the uterine corpus was first reported in 2016, and added as a new item to the 5th edition of the WHO classification in 2020. It accounts for approximately 1% of patients with uterine corpus cancer, being rare. The histology of this carcinoma varies, making pathological diagnosis difficult. A diagnosis is made at an advanced stage in comparison with other histological types of uterine corpus cancer, and the prognosis is reportedly poor with high-level malignancy. In addition, there are few case reports of mesonephric-like adenocarcinoma of the uterine corpus with sarcoma. In this study, we report a patient in whom preoperative chemotherapy was performed under a diagnosis of cervical carcinoma, but the resected specimen led to a diagnosis of sarcomatous component-mixed mesonephric-like adenocarcinoma of the uterine corpus after surgery.
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Section 1

We encountered an extremely rare patient with primary MLA of the uterine corpus accompanied by the sarcomatous component. The malignancy level of MLA is higher than that of other histological types of uterine corpus cancer, and the prognosis is poor. However, neither treatment nor follow-up strategies have been established. In the future, a larger number of patients should be accumulated for further research.

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