What is the treatment for the reduced food intake and vomiting in my 79-year-old father?

Hello doctor,

I am writing this query for my father, who is 79 years old. He was healthy and had no major health issues other than grade II prostatomegaly, and he has been using the medicine Veltam 0.4 daily once. From seven months, he was suffering from frequent constipation and thus reduced his food intake. A few days later, we insisted him to consult with our family doctor. After consulting, our doctor suggested going with an ultrasound scan. The report impression is a bilateral renal cortical cyst, grade II prostatomegaly. PVR was nil. No dilated or thickened bowels mass was seen, and no free fluid in the peritoneal cavity. After studying this report, the doctor advised going with CT scan. CT scan report impression; bilateral renal cysts seen, cystitis changes, prostatomegaly, dilated ascending colon, and transverse colon seen. No obvious significant wall thickening was seen. After studying the CT report, he suggested consulting with a gastroenterologist. Despite our repeated request to meet a gastroenterologist, he refused to do so. Recently he felt abdomen pain and vomiting; then, we forced him to take it to the gastroenterologist. The doctor advised going with ultrasound, CT, and certain blood tests. The impression of hepatic mass is 11 x 6 cm seen in the left lobe, abutting the pancreas. grade II prostatomegaly, thin ascitis. CT scan reports and blood test results are attached for your perusal. Gastroenterologist suggested the finding seems to be serious; and thus consult with an oncologist.

Sir, now what should we do? What is your opinion after studying the attached reports? Is this serious? Gastroenterologist indicated my father might have to undergo surgery. Is this necessary? If so, what would be the cost?