Browsing by Author "Alkan, I"

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Mixed Apocrine Sweat Gland Tumor of the Tail in a Cow
(Amer Coll vet Pathologist, 2002) Gulbahar, MY; Alkan, I; Aslan, L; Golen, I
A 4-year-old native-breed cow had a mass with wide areas of ulceration and hemorrhage at the base of the tail at the same level as the vulva. The tumor was 19 X 13 X 11 cm, appeared red-brown, and was firm to hard, with gritty areas apparent on cut surface. Histologically, the tumor mass was composed of multilayered epithelial cells forming glandular structures with occasional apical blebs and rare solidly packed cells in nests. The stroma included fibrous connective tissue, scattered or periglandular sheets of spindle-shaped cells resembling myoepithelium, several cartilaginous formations, and numerous irregular islands of mineralized osteoid, well-formed bone trabeculae lined by osteoblasts, and many osteoclast-like multinucleated giant cells among or near the neoplastic epithelium. Immunohistochemically, the neoplastic epithelium was positive for pan-cytokeratin (AE1/AE2) and cytokeratin 19 but was negative for cytokeratin 18. Spindle-shaped cells were stained with alpha smooth muscle actin (alphaSMA) and to a lesser extent vimentin antibodies. The cells of osteogenic lineage and spindle cells closely associated with the osteoid showed strong immunostaining for vimentin but not for alphaSMA. Immunostaining for neuron-specific enolase and S 100 protein was not observed in any component of the tumor mass. These findings sugguested that the origin of bone formation was undifferentiated mesenchymal cells with osteogenic potential.
Use of an Autologous Vein Graft and Stent in the Repair of Common Bile Defects: an Experimental Study
(Springer verlag, 1998) Karaayvaz, M; Ugras, S; Guler, O; Aydin, M; Alkan, I; Yigit, MF
We investigated the effectiveness of using an autologous vein graft and stent in the repair of large defects of the common bile duct (CBD) in a canine model. A 3-cm segment of the vena cephalica antibrachii and a 2-cm segment of the CBD were removed from eight healthy mongrel dogs with normal blood biochemistry levels. A stent was passed through the vein segment, and one end was introduced into the proximal end of the CBD while the other end was introduced into the distal end. The venous graft was then sutured to the CBD. A liver biopsy was taken for histopathological examination during laparotomy and relaparotomy. Blood samples were obtained on postoperative days 7, 14, and 20 for biochemical examination. The defect was effectively repaired by the autologous vein graft and stent in 7 dogs, after the exclusion of 1 dog that died of hemorrhage 3 days after the operation. No change in blood biochemistry was observed postoperatively, and no histopathological change in the liver was found in the preoperative or postoperative periods. These findings indicate that the use of an autologous vein graft and stent to repair CBD injuries may be a feasible and alternative method of treatment.