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Aim The study was conducted to delineate the histological problems in diagnosing uterine mesenchymal tumors in morcellated material. Methods All cases of morcellated uteri performed between 2008 and 2014 were reviewed. The incidence of unexpected malignancy, defined as any neoplasm with a clear-cut diagnosis of leiomyosarcoma (LMS) or endometrial stromal sarcoma (ESS), was noted. Cases with absolute discrepancy between the diagnosis of the morcellated tumor and the subsequent diagnosis were also included in the study. Results Out of 631 cases, a final diagnosis of LMS or ESS was made regarding three and five tumors, respectively. Patient age ranged from 25 to 48 years. Two further cases initially diagnosed as ESS proved to be endometrial stromal nodules with smooth muscle differentiation. Two cases were diagnosed as smooth muscle tumors with uncertain malignant potential and the patients remain free of disease. One tumor was diagnosed as an endometrial stromal neoplasm and proved to be benign and finally a leiomyoma variant presented with presumed peritoneal disease. Conclusion Both endometrial stromal and smooth muscle tumors with malignant behavior can be encountered at a young age. Because of the limitations in histological evaluation, morcellated tumors may be overdiagnosed or underdiagnosed by pathologists. [ABSTRACT FROM AUTHOR]

Pavlakis K, Messini I, Vrekoussis T, Panoskaltsis T, Chrysanthakis D, Yiannou P & Voulgaris Z (2011) Histopathology , 966-973 To investigate whether the microcystic, elongated and fragmented (MELF) pattern of myometrial invasion encountered in certain endometrioid endometrial carcinomas can be considered as a risk factor for lymph node metastasis. A total of 351 cases of total abdominal hysterectomy and bilateral salpingo-oophorectomy with/without lymphadenectomy or lymph node sampling, performed for endometrioid endometrial adenocarcinoma, were included in this study. The existence of MELF invasion, vascular invasion, fibromyxoid stromal reaction and lymph node metastasis were recorded. Immunohistochemistry for endothelial and epithelial markers was performed on selected cases. MELF invasion was identified in 20 (10.81%) and 13 cases (13.13%) treated without and with lymphadenectomy, respectively. All these cases were either well or moderately differentiated carcinomas, stages IA-II (without considering lymph node status). Positive lymph nodes were detected in seven of 13 MELF-positive (53.84%) and six of 86 MELF-negative cases (6.97%) This observation was statistically significant. Of the seven MELF-positive tumours with lymph node metastasis, three cases exhibited intravascular tumour emboli while four showed a fibromyxoid stromal reaction. MELF pattern invasion was found to be related statistically to lymph node metastasis. Nevertheless, further studies are needed in order to evaluate the clinical significance of this observation. [ABSTRACT FROM AUTHOR]