Journals / Ahi Evran Tıp Dergisi / 2025 / Volume: 9 Issue: 3

An Endometrial Stromal Tumor with Extensive Smooth Muscle Differentiation, Collagenous Rosettes and Focal Fibromyxoid Change: Case Report and Diagnostic Pitfalls

Hale Kivrak(UNIVERSITY OF HEALTH SCIENCES, GÜLHANE SCHOOL OF MEDICINE, GÜLHANE MEDICINE PR. (ANKARA))0000-0002-1637-7553
Elçin Kadan(UNIVERSITY OF HEALTH SCIENCES, GÜLHANE SCHOOL OF MEDICINE, GÜLHANE MEDICINE PR. (ANKARA))0000-0002-8006-0972
Vildan Altahhan(UNIVERSITY OF HEALTH SCIENCES, GÜLHANE SCHOOL OF MEDICINE, GÜLHANE MEDICINE PR. (ANKARA))0000-0002-1792-8708
Özhan Özdemir(UNIVERSITY OF HEALTH SCIENCES, GÜLHANE SCHOOL OF MEDICINE, GÜLHANE MEDICINE PR. (ANKARA))0000-0002-0930-775X
Önder Bozdoğan(UNIVERSITY OF HEALTH SCIENCES, GÜLHANE SCHOOL OF MEDICINE, GÜLHANE MEDICINE PR. (ANKARA))0000-0002-2917-6646
Pages
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Publication Date
2025-12-22
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

Recognizing this morphologic variant of ESN is crucial for accurate tumor classification.

📌 3 Key Takeaways

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Objective & Hypothesis:Endometrial stromal tumors (ESTs) are the second most common type of uterine mesenchymal tumors and endometrial stromal nodule (ESN) is a benign neoplasm within this category.
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Key Findings & Data:Immunohistochemical analysis showed that, the tumor cells were diffusely positive for B-catenin and WT-1, focally positive for CD56, smooth muscle marker, CAM5.2, PanCK and CD10.
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Conclusion & Impact:Recognizing this morphologic variant of ESN is crucial for accurate tumor classification.
🔬Design:Case Report
📍Scope:Comprehensive Sample
⚙️Variables:collagen rosets · endometrial stromal nodule · smooth muscle differentiation

Abstract

Endometrial stromal tumors (ESTs) are the second most common type of uterine mesenchymal tumors and endometrial stromal nodule (ESN) is a benign neoplasm within this category. ESNs can exhibit smooth muscle differentiation, epithelial patterns, or fibromyxoid stroma, which can complicate differential diagnosis. In this report, we present a rare case of ESN with featuring extensive smooth muscle differentiation and focal myxoid areas. Grossly, the tumor was intramural, well-circumscribed, and cystic. Histologically, the tumor consisted of cellular areas, myxoid areas, and extensive collagen roset formation. Immunohistochemical analysis showed that, the tumor cells were diffusely positive for B-catenin and WT-1, focally positive for CD56, smooth muscle marker, CAM5.2, PanCK and CD10. ESN with smooth muscle differentiation and collagenous rosettes should be considered in the differential diagnosis of intracavitary and intramural uterine mesenchymal tumors. Both fibromyxoid stroma and extensive smooth muscle differentiation have been documented in ESNs. Recognizing this morphologic variant of ESN is crucial for accurate tumor classification.

Özet

Endometriyal stromal tümörler (EST'ler) uterin mezenkimal tümörler içerisinde 2. sıklıkta görülür ve endometrial stromal nodül (ESN) bu grup içerisindeki benign neoplazmıdır. ESN, düz kas diferansiyasyonu, epitelyal paternler veya fibromiksoid stroma içerebilir, bu da ayırıcı tanıyı zorlaştırır. Burada, yaygın düz kas farklılaşması ve fokal miksoid alanlar içeren nadir bir ESN olgusu sunulmaktadır. Makroskopik olarak, tümör intramural, iyi sınırlı ve kistikti. Histolojik olarak, tümör selüler alanlar, miksoid odaklar içermekteydi ve yaygın kollajen rozet formasyonları oluşuyordu. İmmünohistokimyasal olarak, tümör hücreleri B-katenin ve WT-1 için yaygın pozitif; CD56, düz kas belirteçleri, epitelyal belirteçler ve CD10 için fokal pozitifti. Düz kas farklılaşması ve kollajenöz rozetler içeren ESN, intrakaviter ve intramural uterin mezenkimal tümörlerin ayırıcı tanısında düşünülmelidir. ESN'de fibromiksoid stroma ve yaygın düz kas farklılaşması tanımlanmıştır. ESN'nin bu morfolojik varyantının bilinmesi doğru tümör sınıflandırması için önemlidir.

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Cite This Article

Kivrak, H., Özdemir, Ö., Bozdoğan, Ö. (2025). An Endometrial Stromal Tumor with Extensive Smooth Muscle Differentiation, Collagenous Rosettes and Focal Fibromyxoid Change: Case Report and Diagnostic Pitfalls. Ahi Evran Tıp Dergisi, Volume: 9 Issue: 3. https://doi.org/10.46332/aemj.1644066

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