Chevron (Roof Top) Modification :
The incision may be continued across the
midline into a double Kocher incision or roof top
approach (Chevron Incision) (Figure 6), which
provides excellent access to the upper abdomen
particularly in those with a broad costal margin....
http://medind.nic.in/jae/t01/i2/jaet01i2p170.pdf

See also:

http://www.google.com.ar/search?hl=es&q=incisión de chevron ...

The most frequent incision utilized to open the abdomen for liver surgery is called a chevron incision. In this incision a cut is made on the abdomen below the rib cage. The cut starts under the armpit below the ribs on the right side of the abdomen and ...
http://www.surgery.usc.edu/divisions/tumor/pancreasdiseases/...

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Note added at 40 mins (2007-12-24 12:43:12 GMT)
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See also:
http://www.bago.com.bo/residencia/html/cc_cir1.html

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Note added at 44 mins (2007-12-24 12:46:24 GMT)
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Another reference to check is:
Congreso Argentino de Urología 2007 TrabajosSe efectuó nefrectomía derecha con abordaje transperitoneal utilizando incisión en boca de horno (Chevron). La masa tumoral estaba firmemente adherida al ...

http://www.auxsoft.com/sau2007/trabajos/ver/P-1