Browsing by Author "Karadeniz, T"

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    Effectiveness of diffusion-weighted magnetic resonance imaging (DW-MRI) in the differentiation of thyroid nodules
    Özer, BM; Pabusçu, Y; Tarhan, S; Ovali, GY; Aydede, H; Demireli, P; Karadeniz, T
    BackgroundThe aim was to investigate which of two different b values (b 500 s/mm(2) and b 800 s/mm(2)) are more effective in the differentiation of benign-malignant nodules using Diffusion-Weighted Magnetic Resonance Imaging (DW-MRI).Materials and methodsPatients presenting with a preoperative diagnosis of nodular goiter or multinodular goiter were included in this study. These patients underwent neck MRI examinations, and their cases were analyzed retrospectively. A total of 26 patients were included in the study. A total of 46 nodules meeting the study criteria were examined. Measurements were performed on Apparent Diffusion Coefficient (ADC) maps of patients at two different b values (b 500 s/mm(2) and b 800 s/mm(2)), and the results were compared with histopathological findings.ResultsOut of a total of 46 nodules, 37 were identified as benign, and 9 as malignant based on histopathological analysis. The mean ADC value at b 500 was lower in malignant nodules (1259.65 +/- 328.13) compared to benign nodules (19037.48 +/- 472.74). Similarly, the mean ADC value at b 800 was lower in malignant nodules (1081.72 +/- 200.23) compared to benign nodules (1610.44 +/- 418.06). When a cut-off value of 1.1 x 10- 3 was accepted for the differentiation of pathology, the sensitivity for distinguishing pathology with ADC values at b 500 was 83.3%, with a specificity of 90.0%, and for ADC values at b 800, the sensitivity was 71.4%, with a specificity of 89.7%.ConclusionDW-MRI without the need for contrast agent administration is a useful method in the differentiation of benign-malignant thyroid nodules.
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    Gastric Carcinoma Demonstrating Rhabdoid Features
    Karadeniz, T; Ayhan, S; Turna, A; Tireli, M
    Rhabdoid tumor, first described as an aggressive kidney tumor in infants and children and also observed less commonly in extra-renal locations, is seen very exceptionally in the gastrointestinal system. Gastrointestinal tumors with rhabdoid features are also extremely rare. A 59-year-old man with a long history of nausea, vomiting and weakness had been diagnosed as diffuse-type gastric carcinoma by the evaluation of endoscopic biopsy specimen at an other hospital. The total gastrectomy specimen showed an ulcerated mass measuring 7x4x4 cm located at the lesser curvature. The tumor penetrated the entire gastric wall and invaded the perigastric fat. The histopathological and immunohistochemical evaluation revealed a gastric carcinoma with rhabdoid features. The tumor was presented to emphasize the importance of clinical, morphological and immunohistochemical differential diagnosis from diffuse type gastric carcinoma as it has a very poor prognosis and is rarely seen in the gastrointestinal system.
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    Comparison of Nephron-protective Effects of Enalapril and GLP Analogues (Exenatide) in Diabetic Nephropathy
    Çavusoglu, T; Erbas, O; Karadeniz, T; Akdemir, O; Acikgoz, E; Karadeniz, M; Tuglu, MI; Ates, U
    Background: One of the major concerns is a nephropathy in diabetes, which applies many different kinds of medicines. However, required level of the treatment of renal disease has not been achieved. Aim: To investigate and compare the effect of the enalapril and the exenatide on diabetic nephropathy in rats developed diabetes by streptozosin. Material and Methods: 32 male Sprague Dawley rats were divided into 4 groups: (1) Control, (2) Diabetic (DM), (3) DM + Enalapril, and (4) DM + exenatide groups. Then, the animals were euthanized and their blood samples were collected by cardiac puncture for blood glucose; blood urea nitrogen (BUN), creatinin, and nephrectomy were performed for histopathologic examination, and urine samples were taken on stick for proteinuria. Results: Administration of the enalapril or the exenatide in diabetic rats resulted in a significant reduction both fibronectin, induced nitric oxide synthase (i-NOS) expression in glomerular area and urine protein levels. It was shown that both of enalapril and exenatide protected the renal glomerulus more than diabetic group in the nephropathy histopathologically. Conclusion: The beneficial effects of enalapril and exenatide which reduces fibronectin, i-NOS expression and urine protein levels or increases recovery of glomerules, might be used for preventing the harmful effects of diabetic nephropathy.
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    Experimental comparison of protective characteristics of enalapril and trimetazidine in diabetic nephropathy
    Karadeniz, T; Cavusoglu, T; Turkmen, E; Uyanikgil, Y; Karadeniz, M; Akdemir, O; Tuglu, MI; Ates, U; Erbas, O
    Hyperglycemia, hypertension, dyslipidemia, and inflammation have been proposed to account for the development of nephropathy in diabetic subjects. The beneficial effects of enalapril on diabetic nephropathy are known. However, the effects of trimetazidine (TMZ) are still unknown. We aimed at comparing the effects of the enalapril and TMZ treatment on fibronectin expression, inducible nitric oxide synthase expression, urine proteinuria, blood glucose and glomerular, and mesangial structures of kidney in rats that take streptozotocin (STZ). In this study, 32 male Sprague-Dawley albino mature rats of 8 weeks, weighing 200-220 g were used. Diabetes was induced by intraperitoneal injection of STZ (60 mg/kg) for 24 rats. We made four groups (Group 1: control, non-diabetic rats (n = 8), Group 2: diabetes, without treatment (n = 8), Group 3: diabetes treatment with enalapril (n = 8), Group 4: diabetes treatment with TMZ (n = 8). The positive effects of renal tissue and tubules in the mesangium immunohistochemical were shown in TMZ receiving rat groups. These positive effects were in parallel with the reduction in fibronectin and I-NOS expression and reduction in the proteinuria. TMZ and enalapril treatment of diabetic rats and renal parenchyma in this study are shown to have positive effects on the different levels.
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    The Protective Effect of Losartan on Diabetic Neuropathy in a Diabetic Rat Model
    Cavusoglu, T; Karadeniz, T; Cagiltay, E; Karadeniz, M; Yigitturk, G; Acikgoz, E; Uyanikgil, Y; Ates, U; Tuglu, MI; Erbas, O
    Aim: Involvement of the peripheral and autonomic nervous systems is possibly the most frequent complication of diabetes. Important risk factors included hyperglycemia, dyslipidemia, hypertension, and smoking. Angiotensin-converting-enzyme inhibitor (ACE) inhibitors should be beneficial in all vascular beds, including neuropathy and retinopathy. In this study we aimed to evaluate the effect of the angiotensin receptor blocker losartan on diabetic neuropathy in a diabetic rat model. Material and Methods: 24 male, Sprague Dawley albino mature rats were divided into 3 groups; (1) control group: No drug was administered to the remainder of rats which blood glucose levels were under 120mg/dl, (2) diabetic control: rats were given no medication, but 4ml per day of tap water was given by oral gavage, (3) losartan groups: rats were given 10mg/kg/day oral of losartan for 4 weeks. Electromyography (EMG) was applied to anesthetized rats at the end of 4(th) weekend. Then, the animals were euthanized and sciatic nerve was performed for histopathological examination. Results: Compound Muscle Action Potential (CMAP) amplitude of diabetic rats receiving the Saline in the EMG was significantly reduced when compared to the control group. Distal latency value and CMAP duration of diabetic rats receiving the saline were meaningfully increased when compared to the control group. CMAP amplitude and CMAP duration of diabetic rats receiving the Losartan treatment in the EMG were meaningfully reduced when compared to diabetic rats receiving the Saline. Perineural thickness in the rats receiving the Losartan treatment was found to be significantly reduced when compared to the group receiving the Saline. Conclusions: As a result, it has been shown in this study that perineural thickness of the Losartan treatment was significantly reduced when compared to saline receiving group, significantly increased the immunoexpression of NGF, and also provided a significantly recovery in EMG when compared to Saline receiving group.