Colonoscopy and sigmoidoscopy are very similar investigations. Sigmoidoscopy allows visualisation of only the distal part of the colon while colonoscopy allows visualisation of the entire large bowel and the distal small bowel, as well. Both investigations involve passing a camera through the anus.
Anencephaly is a birth defect due to unknown causes in most situations. However, research shows that a deficiency of folic acid during early pregnancy can play a role in neural tube development. In addition, a family history of anencephaly increases the probability of the birth defect.o research the causes of Anencephaly, consider researching the causes of these these diseases that may be similar, or associated with Anencephaly: 1  Neural tube defect. 2  NTD. 3  Neural tube defect spectrum. 4  Absent cerebellum. 5  Absent cerebrum.
1 Anencephaly is an example of a neural tube defect, a condition that results from an error in the first weeks of embryonic development. 2  In anencephaly, the bones of the skull and brain do not develop properly.3  Babies with anencephaly are missing large areas of the brain and have an incomplete skull.nencephaly is a condition that prevents the normal development of the brain and the bones of the skull.