que afecata casi la totalidad de la luz

09:03 Oct 2, 2017 

it should read "el calibre de la luz (foto 2)"

06:31 Oct 2, 2017 

I have double-checked the definition, and you are correct. I don't know if I misread an earlier definition or if it can be both, but most definitions seem to refer to the space.

06:15 Oct 2, 2017 

I get your point; we see 2 different things. I understand that the lumen is the space, whereas you see it as the lining. If a lesion affects nearly the whole space, it obstructs or occludes it. If it is affecting the intestinal lining, it's a different matter.

22:16 Oct 1, 2017 

We need to know "calibre de la ?????" From the description, the lesion is affecting the lumen (intestinal lining) with a proliferative component that is partially reducing the diameter of the ????

Liz is correct about 'occluding'. In my understanding, the "totalidad" is referring to the 5 cm distance between 30 and 35 cm up from the anal margin. In other words, there is a 5 cm stretch of the abdominal wall that is covered with a lesion (lesions?) with both infiltrating/ulcerative and proliferative characteristics. The proliferative part is partially reducing the diameter of (presumably) the passageway, though we don't know for sure until we know what follows "calibre de la ..."