This explanation pertains to a successful surgical treatment for a liposarcoma, a rare type of cancer that begins in the fat cells:

"Therefore, removal and reconstruction of those involved organs and the surrounding vessels were necessary to achieve complete tumor resection. Reconstruction of the IVC was not performed because it was already occluded by the tumor and a collateral venous pathway had developed. We selected Ax-F & F-F bypass through the subcutaneous root for the reconstruction of the aorta to avoid vascular graft replacement infection because an intra-abdominal vascular graft has risks of infection associated with pancreatic fistula following pancreatoduodenectomy. Although Ax-F & F-F bypass is usually inferior to anatomical bypass with respect to patency, it has been reported that the 5-year patency rate of Ax-F & F-F bypass is 71% for peripheral arterial occlusive disease [9, 10], which seems acceptable" (emphasis added). Source: https://academic.oup.com/jscr/article/2017/11/rjx200/4653546

Note: I've also seen several references to "pre-anatomical bypass". That might be an optional translation.

--------------------------------------------------
Note added at 37 mins (2019-01-17 11:37:42 GMT)
--------------------------------------------------

Correção à nota anterior:
extra-anatomical bypass