Abstract and keywords
Abstract (English):
The authors described a case of a rare, asymptomatic form of tumors of the retroperitoneal space (leiomyoma) with a successful outcome in the young man, 19 years old. Connective tissue mast cells were detected in the tumor and examined. The instability of their population is morphologically obvious, and morpho-functional parameters in different areas of the tumor are heterogeneous. A slight amount of mast cells have been detected in dense parts and nodular tumors. Their number and degree of degranulation were highest in areas of inflammation and plethora, as well as on the periphery of the cystic parts of the tumor. The reactivity of a population of mast cells in the processes of tumor formation was confirmed morphologically by the results of this study. It is recommended to consider with prognostic purposes and with a view to developing optimal therapeutic and preventive strategies.

Keywords:
leiomyoma, retroperitoneal tumor, mast cells, young man
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