A 28 year old female patient complains of abdominal pain and swelling. Patient gives h/o multiple diagnostic CT-scans of the abdomen and pelvis. Patient is 10 weeks pregnant. Which of the following effects may be present in this fetus?: (A) Microcephaly, (B) Mental retardation, (C) Both of the above, (D) None of the above
Answer is C. In humans, fetal irradiation is associated with microcephaly (irradiation at 8 to 15 weeks gestation) and mental retardation (irradiated at 8 to 25 weeks gestation).
 
Reference: White and Pharoah, Oral radiology, ed 8th, pg-96