<unk>  is a rare disorder in which there is abnormal fetal development of the lower spine which can lead to a variety of problems ranging from partial absence of the tail bone regions of the spine to more severe cases involving major malformation of the lower vertebrae, pelvis and spine.  Minor cases may be more or less without symptom, whereas severe cases may come with major birth defects, neurological impairment and incontinence.
Caudal regression syndrome
Spina bifida
Anencephaly
Gonadal dysgenesis
Cleidocranial dysplasia
Cryptorchidism
Omphalocele
Hydranencephaly