Distant Ureteral Metastasis from Colon Adenocarcinoma: Report of a Case and Review of the Literature

Carcinomas arising from organs neighbouring the ureter can directly infiltrate the ureter. Distant ureteral metastasis from colon adenocarcinoma is extremely rare and usually an incidental finding in performed autopsies. We report a case of a right ureteral metastasis in a 65-year-old Caucasian male with a history of rectal cancer for which he had been treated 4 years before. He presented with asymptomatic moderate right hydronephrosis. The patient underwent a right nephroureterectomy. Histology of the ureter revealed transmural adenocarcinoma with infiltration of the mucosa. Infiltration of the muscular coat of the bladder was found 2 years later. Thus, cystectomy and left ureterocutaneostomy were performed. The patient died 6 months later due to toxic megacolon during chemotherapy. The differential diagnosis of ureteral adenocarcinoma, especially in patients with previous history of colon adenocarcinoma, should include the possibility of distant metastasis from the primary colonic tumor.

Histological Study of the Isthmus Segment of the Oviduct in Female Turkey at Egg-Laying Stage

The histological pattern of the isthmus segment of the oviduct in laying turkey was conducted on five adult and healthy females. Morphometric measurements were obtained for the thickness of mucosa, height, and thickness of mucosal folds, epithelial height, and thickness of the muscular coat. The result revealed that the mucosa consisted of longitudinal, broad folds carried secondary ones. The epithelial lining was pseudostratified columnar comprised two cell types, ciliated and non-ciliated cells. The glands were tubularly coiled branched showing secretory activity, tunica muscularis was well developed and consisted of two layers.

Morphological studies on the seasonal changes in the epididymal duct of the one-humped camel (camelus dromedarius)

The present work was carried out on 20 testes and epididymis of sexually mature camels to elucidate the gross anatomical, morphometerical, light microscopical and scanning electron microscopical features of the epididymis in different seasons. Anatomically, the epididymal duct of a camel consists of three parts head, body and tail. Histomorphologically, the epididymal duct is subdivided into initial, middle and terminal segments, of which the middle segment is further subdivided into proximal, intermediate and distal parts. There is a gradual decrease in the epithelial height of the epididymal duct from the initial to the terminal segments. This mechanically facilities passage of the sperms toward the terminal segment. High epithelium in the initial segment may indicate a more absorptive power of the epithelium in this segment. The seasonal reproductivety of the epididymal duct in the camel expressed by variations in the weight and volume of the epididymis, total diameter of the epididymal duct, epithelial height, length of the stereocilia, thickness of the muscular coat and cellular distributions in different segments. The spring months offer ideal circumstances for maximal reproductive activity in this species. The cellular components of the epididymal duct epithelium of the camel displays important morphological changes from season to another showing signs of increasing activity during spring in comparison to decreasing activity in other seasons. PAS positive granules are demonstrated in different segments of the epididymal duct and intraepithelial glands in different seasons. These granules are relatively more numerous in spring. The lamina propria surrounding the epididymal duct contains a layer of the elastic fibers which is very thick in winter, thick in spring and thin in other seasons. This increase in thickness of the elastic fibers predisposes for the increase in the total diameter of the epididymal duct in spring. It was conclude that the muscular coat of the middle and terminal segments is the thickest in spring that may be helpful for powerful ejaculation.