I'm only giving this 3 because I'm finding it hard to locate a clear anatomical description of what the "cúpula hepática" actually is. I think it just means the top part of the liver, which is kind of dome-shaped, fitting into the dome of the diaphragm. Anyway, "hepatic dome" is fairly common in English, and there is a reasonable sprinkling of results for "hepatic dome tumo(u)rs", and some also for "liver dome tumo(u)rs", so I think you could use either.

" Ct scan results show a small hypodense focus on hepatic dome
It states most likely to be a cyst but 2 small to tell. Does this sound like something serious? What's a hepatic dome? [...]
The liver is an irregularly, domed shaped organ. The hepatic dome refers to the top 1/3rd of the liver, especially the part that the lungs overlay."
https://answers.yahoo.com/question/index?qid=20080804222151A...

"Brennan, D.D., Ganguli, S., Brecher, C.W., Goldberg, S.N. "Thinking outside the abdominal box: safe use of the epipericardial fat pad window for percutaneous radiofrequency ablation of hepatic dome tumors.." J Vasc Interv Radiol"
http://health.usnews.com/doctors/chad-brecher-461250

"Compared to laparoscopy, gaining access to tumors in the dome of the liver may be more easily obtained via thoracoscopy [...] have already performed radiofrequency ablation (RFA) of superficial liver dome tumors through a thoracoscopic transdiaphragmatic approach"
Jordan M. Cloyd, Brendan C. Visser, "Video-assisted thoracoscopic transdiaphragmatic liver resection for hepatocellular carcinoma"
http://link.springer.com/article/10.1007/s00464-011-2062-x