Diagnosis of different pathohystological diseases of prostate in the most cases based on common benignant and malignant characteristics. The presence of periacinar cleftings (PC) is an additional criterion favouring prostatic adenocarcinoma. The aim of our work was to examine the presence of PC around glands in prostatic adenocarcinoma (PA), prostatic intraepithelial neoplasia (PIN) and benign hyperplasia of prostate (BHP) and to determinate specificity and sensitiveness for their presence in PA. We analysed biopsy material of Institute of pathology, Medical faculty Priština and Department of pathology and forensic medicine Clinical center of Kragujevac from begining of 2007. till the end of 2008. According to the presence and extent of PC, analysed on high power field (400x), glands were classified as: group 1 - glands without PC or with PC affecting ≤50% of gland circumference; group 2 - glands with PC affecting >50% gland circumference in <50% examined glands and group 3 - glands with PC affecting >50% gland circumference in ≥50% examined glands. By the analyse of our material we found PC around glands in PA, PIN and BHP: the most glands in PA were group 2 (34 or 48,6%) and group 3 (31 or 44,3%), in PIN group 1 (12 or 60%) and group 2 (8 or 40%), in BHP glands at all 100% cases were group 1. We found sensitiveness 92,9% and specificity 73,3% for glands with PC at prostatic adenocarcinoma, which indicate that periacinar cleftings represent a reliable criterion in diagnosis prostatic adenocarcinoma. 

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