Ultrasound images of abnormal fetal femurs

(A) Mild shortening with bowing of the femur in a 20.2 week fetus with the diagnosis of asphyxiating thoracic dystrophy.
(B) Severe micromelia (entire limb shortening) of the lower extremity in a fetus at 24 weeks with the diagnosis of thanatophoric dysplasia type 2. Note surrounding thickened redundant soft tissues, which have grown relatively faster than the short long bones.