ABSTRACT Extraovarian granulosa cell tumors (GCTs) develop from ectopic gonadal tissue situated along the embryonal route of the genital ridge. Primary retroperitoneal tumors are extremely rare, with an incidence of 02% -06% and 80-85% probability of malignancy. Only eight such case reports have been published previously. We herein, report a rare case of extraovarian retroperitoneal GCT in a 55-year-old woman who presented with intermittent left lumbar region pain of one-year duration. She had a history of hysterectomy and bilateral salpingo-oophorectomy 8 years ago for uterine leiomyoma. Laparotomy revealed a retroperitoneal mass measuring 8cm x 10cm x 20cm in size, solid cystic with areas of necrosis and hemorrhage. The gross features, classical histopathology, and positive immunostaining of the retroperitoneal mass with inhibin, calretinin, PR, WT1 and immunonegativity for EMA were characteristic of adult-type GCT. Excluding any previous history of primary ovarian GCT in this patient, a de-novo retroperitoneal diagnosis was established.

In this paper, we deal with the existence and uniqueness of piecewise square meanweighted pseudo almost periodic solutions for a class of fractional order stochastic impulsive differential equations. The working tools are based on fixed point technique, fractional power operators and stochastic analysis; methods and theory are adopted from deterministic fractional systems. In addition, an example is given to illustrate the theory.

En este artículo estudiamos la existencia y unicidad de soluciones pseudo casi periódicas con pesos promedio cuadrado a trozos para una clase de ecuaciones diferenciales estocásticas impulsivas de orden fraccional. Las herramientas de trabajo están basadas en la técnica de punto fijo, operadores de potencia fraccional y análisis estocástico; los métodos y teoría están adaptados a partir de sistemas fraccionales deterministas. Adicionalmente, damos un ejemplo para ilustrar la teoría.