This question is specifically about ectopic pregnancy in the fallopian tube. Other than the reason of the foetus not being able to grow to its full size inside the fallopian tube due to space constraint, what are the other reasons that the foetus cannot grow in the fallopian tube? Please give specific information so that I can read up more if I still do not understand. Thank you.

Googling about this give you lots of hits, such as "In a typical ectopic pregnancy, the embryo adheres to the lining of the fallopian tube and burrows into the tubal lining. Most commonly this invades vessels and will cause bleeding" (Ectopic pregnancy - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Ectopic_pregnancy)).