In the liver, there are many vascular variants, which are important in liver surgery, the presence of accessory right hepatic veins (aRHVs) in particular. Th eir frequency, number and diameter vary considerably. Detailed imaging diagnostics with computed tomography (CT) should be undertaken before surgery. The aim of our study was to examine the characteristics of aRHVs and their demographic correlations. Th e study included data on 188 patients that underwent CT examination of the abdomen with contrast media, 103 men (54.8%) men and 85 (45.2%) women, mean age 63.1}14.3 (range, 21-94) years. The measurements of hepatic veins were carried out on CT images, which were obtained from the Clinical Institute of Radiology, University Medical Centre of Ljubljana. Forty-five of 142 patients had at least one aRHV: one aRHV in 37 (26.1%) cases, two aRHVs in seven (4.9%) cases, and three aRHVs in one (0.7%) case. Th e incidence of aRHV was between 24% and 39.3% (mean, 31.7%) and of more than one aRHV between 2.3% and 10.3% with 95% confi dence interval (CI). Based on the test of proportions, the proportion of cases with inferior aRHV of at least 7 mm was between 7.2% and 18.1% with 95% CI. Th e mean distance between the aRHV and the main RHV confl uences into the inferior vena cava was 3.73 cm (between 3.32 cm and 4.13 cm, 95% CI). The proportion of cases with confl uence distance of at least 4 cm was between 21.6% and 49.5% in cases with at least one aRHV. In cases with more than one aRHV, the distance between the middle aRHV and the main RHV ranged from 1.90 cm to 4.32 cm (95% CI). Th e T-test of independent samples showed no eff ect of age on the incidence of accessory veins (p=0.18), and the test of differences of interests showed no impact of sex (p=0.75). Evaluation of the incidence and diameter of aRHVs is of great importance for safe surgical procedure. Th eir presence can change the surgeon's decision in 10%-20% of cases when employing appropriate imaging technique. CT examination, which is easily accessible and minimally invasive for patients, was successful in only 80% cases, when using standard protocol for CT scanning., U jetri postoji mnoštvo krvožilnih varijanata koje su važne u kirurgiji jetre, osobito prisutnost akcesornih desnih jetrenih vena (aDJV). Njihova učestalost, broj i promjer uvelike se razlikuju. Prije kirurškog zahvata treba provesti detaljnu slikovnu dijagnostiku kompjutoriziranom tomografi jom (CT). Cilj ovoga istraživanja bio je ispitati značajke aDJV i njihove demografske korelacije. Istraživanje je obuhvatilo podatke 188 bolesnika podvrgnutih pretrazi pomoću CT abdomena s kontrastnim sredstvom, 103 (54,8%) muškarca i 85 (45,2%) žena, srednje dobi 63,1}14,3 (raspon dobi 21-94) godine. Mjerenje jetrenih vena provedeno je na snimkama CT dobivenim od Kliničkog zavoda za radiologiju Kliničkog bolničkog centra Ljubljana. Najmanje jednu aDJV imalo je 45 od 142 bolesnika: jedna aDJV utvrđena je u 37 (26,1%), dvije aDJV u 7 (4,9%) slučajeva i tri aDJV u jednom (0,7%) slučaju. Incidencija aDJV procijenjena je na 24%-39,3% (srednja vrijednost 31,7%), a za više od jedne aDJV na 2,3%-10,3%, uz 95%-tni interval pouzdanosti (95% CI). Prema testu proporcija je proporcija slučajeva donje aDJV od najmanje 7 mm procijenjena na 7,2%-18,1%, uz 95% CI. Srednja udaljenost između aDJV i sjecišta s glavnom DJV u donju šuplju venu bila je 3,73 (raspon 3,32-4,13) cm, uz 95% CI. Proporcija slučajeva sa sjecištem udaljenim najmanje 4 cm bila je 21,6%-49,5% u skupini slučajeva s najmanje jednom aDJV. U skupini slučajeva s više od jedne aDJV udaljenost između srednje aDJV i glavne DJV bila je 1,90-4,32 cm (95% CI). T-test nezavisnih uzoraka pokazao je da dob nema učinka na incidenciju aDJV (p=0,18), a testiranje razlika pokazalo je da ni spol nema takav učinak (p=0,75). Procjena incidencije i promjera aDJV veoma je važna za siguran kirurški zahvat. Njihova prisutnost može promijeniti kirurgovu odluku u otprilike 10%-20% slučajeva, uz primjenu dobre tehnike slikovnog prikaza. Pretraga pomoću CT kao lako dostupne i za bolesnika minimalno invazivne tehnike bila je uspješna u samo 80% slučajeva kad se primijenio standardni postupnik skeniranja pomoću CT.