ПАТОМОРФОЛОГІЧНІ ОСОБЛИВОСТІ ЛЕЙДИГОМИ СОБАК

The research for the study of morphological, clinical and macroscopic characteristics of the different histological types of canine testicular tumors. Material was obtained during a routine surgery for the removal of testicular tumors in dogs in clinics of veterinary medicine in Kiev. Tumors were divided into sex-cord stromal tumors and germ cell tumors. Among the sex-cord stromal tumors recorded leydig (interstitial) and sertoli cell tumors. Macroscopical and histologic characteristics of canine interstitial (Leydig) cell tumor are described. It is 12.5% of all testicular tumors. The average age of dogs is 9 years. Largest share is breeds dog such as foxterriers and toyterriers. Interstitial (Leydig) cell tumor has a slower growth compared to other tumors the testicle, no metastases. Half the animals had no clinical signs. Mostinterstitial (Leydig) cell tumor go together with the pathology of adnexal structures. This is because Leydig cell tumor lead to increased levels of androgens. This fact may cause pathology of adnexal structures. Neoplasms are recorded both on the right and the left testis. Leydig cell tumor was not related to the cryptorchid testicles. Most tumors regular oval, brown or gray color, different texture and size with no signs of necrosis or ulceration. The average volume of tumors ranged from 2 to 20 cm2. Microscopically, the tumor is composed of cells that resemble Leydig cells and that are arranged into islands or tubular structures. Find polygonal eosinophilic cells with granular or vacuolated, which contains lipids. Nuclei were round mesh of chromatin and distinct nucleolus. Sometimes noted the large cells with 1, 2 or more nucleoli. In some cases, found elongated fusiform cells with small nuclei and granular eosinophilic cytoplasm. Tumor stroma characterized by calcification. Note mitotically active cells. Cysts lined by tumor cells are present in some tumors. Distinction between benign and malignant forms on purely histological criteria, in the absence of metastasis, often is difficult. Studies on the features of histological structure of testicular tumors will optimize the histological diagnosis of neoplasms.