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.
Anencephaly, also known as âopen skull,â is a birth defect in which the major parts of the brain, scalp, and skull of the fetus do not form completely as it is developing in the womb.n infant who is born with anencephaly has some or most of the brain missing. These infants are unconscious, cannot feel, and are usually blind and deaf. In many cases, some brain tissue may be exposed because parts of the skull are missing. Some infants may have a primitive brain stem at birth.