Background/Aim. Ultrastructural analysis of tumours has shown many common characteristics of certain neoplasms, as well as their specificities. Primary renal epithelial tumours with granular oncocytic cytoplasm is a very heterogeneous group in their histological origin and biological behaviour, which results in a difference in treatment and prognosis of the disease, making accurate morphological diagnosis necessary. The aim of this study was to determine ultrastructural similarities and differences among primary renal epithelial tumours with granular oncocytic cytoplasm. Methods. The analysis of archival and routine material in the archives of the Department of Pathology, University Hospital in Plzen, Czech Republic, as well as archival and routine material in the Centre for Pathology and Histology, Clinical Centre of Vojvodina in Novi Sad, discovered 346 primary renal epithelial tumours with granular oncocytic cytoplasm and divided them into 5 groups: 1) renal oncocytoma (RO) (234 tumours), 2) oncocytic papillary renal cell carcinoma (O-PRCC) (12 tumours), 3. sporadic renal hybrid oncocytic/chromophobe tumour (HOCT) without evidence of Birt Hogg Dubé syndrome (BHD) (14 tumours), 4) chromophobe renal cell carcinoma (ChRCC) (21 tumours) and 5) granular renal cell carcinoma (RCC) [64 tumours + 1 clear cell RCC (CRCC) with hyaline globules]. Ultrastructural analysis of tumour cells at the subcellular level was done using electron microscope (Philips electron microscope TEM 208) at the Department of Pathology, University Hospital in Plzen, Czech Republic. Cellular organelles and pigments were evaluated in 5 tumours from each group according to the simple random sample principle with a total of 30 analysed tumours. Results. In all analysed primary renal epithelial tumours with granular oncocytic, cytoplasm dominant organelles were mitochondria. Specific ultrastructural characteristics of RO were round mitochondria with lamellar cristae, whereas ChRCC had numerous typical cytoplasmic microvesicles 100-700 nm large and mitochondria with tubulovesicular, lamellar and circular cristae. Ultrastructural specificity of hybrid tumours were rare microvesicles and numerous mitochondria of O-PRCC mitochondria with lamellar cristae and small intracytoplasmic vesicles, 100-200 nm large, and of granular RCC, in addition to mitochondria, also glassy hyaline globules (GHG). Conclusion. Ultrastructural analysis indicates mitochondria as the dominant organelle in the analysed tumours. Electron microscopy showed specificities, i.e., differences in appearance of cristae, presence and size of vesicles as well as deposition of pigment in and out of cytoplasm and glassy hyaline globules. ApstraktUvod/Cilj. Ultrastrukturnom analizom tumora uočene su mnoge zajedničke osobine nekih neoplazmi, ali i specifičnosti. Primarni tumori bubrega sa granuliranom-onkocitnom citoplazmom su veoma heterogena grupa po svom histološkom poreklu i biološkom ponašanju, što rezultuje razli-kom u terapiji i prognozi bolesti, zbog čega je neohodna precizna morfološ...
Background/Aim. Prostate carcinoma (PCa) and its parent organ are influenced by hormones, which is used for therapeutic purposes. Through androgen receptors (AR) androgens influence cell growth and function, proliferation, differentiation, apoptosis, lipid metabolism and secretory activity of the prostate, as well as development and progression of PCa. An antiandrogen therapy is carried out in patients with metastatic PCa, in order to block effects of androgens. By conducting immunohistochemical analysis of androgen receptors in the PCa tissue, we can assume how the tumour will react to an administered antiandrogen therapy, both in androgen-positive and androgen-negative, resistant tumours. Knowledge of the presence of AR in the tumour tissue may serve as a prognostic indicator in histopathological analysis. The aim of this study was to evaluate the expression of AR in patients with benign prostatic hyperplasia (BPH) and in those with PCa, before
Introduction. Malignant melanoma is a tumor that develops from melanocytes, so this type of tumor can occur in any part of body containing the cells. Melanoma is less common than other skin tumors. It is very aggressive type of skin tumor with very early metastases and accounts for 75% of cases of death due to skin tumor. In the initial phase the tumor growth is horizontal. Early detection of changes is very important. Over time, as the tumor gets the vertical growth phase, occurrence of metastases depends on the depth of invasion (Breslow). Malignant melanoma metastasizes to regional lymph nodes, but also in the liver, lung, brain and almost any place that can be populated by the haematogenous route. Case report. We reported two cases of patients who were urgently surgically treated in the Emergency Center of Vojvodina, Serbia, with the clinical signs and symptoms of ileus. In both cases, the ileum resection was performed with terminal ileostomy. Histological analysis was performed and through morphology and immunohistochemical profile, in both cases, the diagnosis was metastatic malignant melanoma in the ileum. Conclusion. In patients with diagnosed malignant melanoma of the skin with symptoms of abdominal pain and/or anemia, application of modern imaging techniques is imperative in order to obtain an early diagnosis of gastrointestinal metastases of this tumor, because the rapid detection and radical resection may contribute to the overall survival of these patients.
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