Occurrence Of Ovaries Research Articles

Collision Tumors of the Ovary: Dermoid Cyst with Borderline Epithelial Ovarian Tumor with Metachronous Invasive Epithelial Carcinoma of Ovary- A Case Series

Collision tumor is defined as the coexistence of two or more Histologically distinct tumors adjacent to each other in the same organ without any histological intermixing. Although collision tumors can occur in many organs in the body, its occurrence in ovary is extremely rare. In our series of two patients, dermoid cyst was co-existing with borderline epithelial ovarian tumors in one patient, which is rarest of rare variety of collision tumors reported in ovary. In another patient, there was recurrence in the form of invasive epithelial ovarian malignancy. JMS 2018;21(1):37-39

Collision tumors of ovary: A rare phenomenon

To the Editors, Collision tumors represent a coexistence of two adjacent but histologically distinct tumors without admixture in the same tissue or organ. Though such tumors have been reported often in various organs, their occurrence in ovary is rare. We report here a rare case of collision tumor of ovary comprising serous cystadenoma and mature cystic teratoma. A 55­year­old woman was presented with palpable mass in the lower abdomen associated with pelvic pain and dysfunctional uterine bleeding. Patient underwent right salphingo oophorectomy following ultrasound diagnosis of ovarian tumor. Grossly the tumor measured 6 cm in diameter. Cut surface revealed a trilocular cyst with two locules containing clear fluid. Inner wall of one of the locules exhibited few tiny polypoidal excrescences (Figure 1). The other locule had a gelatinous appearance. Microscopy revealed a combination of morphologic features. Sections from two locules showed the cyst wall lined by unilayer of low cuboidal epithelium which at places exhibited presence of cilia. A few papillary processes lined by ciliated/cuboidal epithelium were also noted. Sections from locule with gelatinous appearance revealed cyst wall lined by well differentiated stratified squamous epithelium (Figure 2), LETTER TO EDITORS OPEN ACCESS

The pattern of ovarian development in the prepubertal antarctic minke whale (Balaenoptera bonaerensis).

This study describes the morphological and morphometrical changes associated with prepubertal ovarian development in the Antarctic minke whale (Balaenoptera bonaerensis). Ovaries were harvested from 94 immature minke whales caught in the Antarctic Ocean during the summer feeding season (December-March). Notable differences in ovarian size and morphology were found among animals. Up to 10 folds difference in ovarian weight was found among prepubertal whales of similar body size. During the prepubertal period, ovaries grew slowly and approximately doubled their weight. The morphologies of right and left ovaries were almost identical while the growth of the ovary appears to occur preferentially on the right side. The most striking morphological feature was numerous small antral follicles less than 5 mm in diameter found in ovaries of younger immature whales. The occurrence of these ovaries was highest in whales less than 6 m long and gradually decreased as body length increased. In larger whales, the occurrence of ovaries with a smaller number of follicles up to 10 mm and thick tunica albuginea increased. Thus, the ovary of the Antarctic minke whale experiences bursts of small follicular development during the early prepubertal period before becoming a more developed ovary with fewer but larger follicles, and thick tunica albuginea.

Lack of evidence for bovine Y‐chromosomal variation in beef traits. A Bayesian analysis of Simmental data

IntroductionY‐chromosomal loci are genetically responsible for some male‐specific biological processes. The sex determining region Y (SRY), a protein with DNA‐binding activity, is known as the trigger for sex differentiation in mammals. In humans the SRY is encoded by a single exon located on the short arm of the Y chromosome, close to the pseudoautosomal boundary (S inclair et al. 1990). Moreover, the Y chromosome harbours the male‐specific histocompatibility antigen (reviewed by S impson et al. 1997) and there are at least two regions of the Y chromosome, which have been shown to be essential for normal spermatogenesis in mice (E lliott and C ooke 1997).The sexual dimorphism of aggression in mice has led to a search for its foundation on the Y chromosome. The existence of Y‐chromosomal genetic variation for aggressiveness with genetic factors borne both on the pseudoautosomal (YPAR) and on the nonpseudoautosomal (YNPAR) region of the Y chromosome (S luyter et al. 1996) has been shown. Another example for Y‐induced genetic variation in mice is the testis autosomal trait (occurrence of ovaries or ovotestes in XY animals), which is observed when specific Y chromosomes interact with the autosomal background of certain laboratory mouse lines (E isner et al. 1996). A comparison of the resemblance of different types of relatives indicated a nonzero Y‐chromosomal variance for body weight in mice (B& uuml; nger et al. 1995).In cattle the Y chromosomes of the Bos taurus and Bos indicus subspecies can be morphologically distinguished: its shape is submetacentric in B. taurus and acrocentric in B.indicus. This difference is caused by a pericentric inversion (G oldammer et al. 1997) and has frequently been used to investigate the introgression of zebu genes into B. taurus breeds.The polymorphism of the bovine Y chromosome itself and the results of mouse research both direct the scientific curiosity on the possible contribution of the bovine Y chromosome to quantitative genetic variation in cattle, a question which, to the authors’ knowledge, has not been investigated before. In this paper we first discuss the contribution of autosomal, imprinted, and sex‐linked genes to the resemblance of full and half sibs and then present a Bayesian estimation of a Y‐chromosomal variance component for each of four beef traits in young Simmental bulls using mixed linear and threshold models.