Table 3 Distribution of the principal polymalformations identified

Myelomeningocele + hydrocephalus

5

2.4

Myelomeningocele + hydrocephalus + abnormalities of the lower limbs^a

5

2.4

Thanatophoric dwarfism^b

5

2.4

Beckwith Wiedemann syndrome^c

4

1.9

Polydactylies + club feet

3

1.4

Trisomy 21^d

3

1.4

Sirenomelia (baby mermaid)^e

2

0.9

Prune Belly Sequence^f

2

0.9

labio-palatal cleft + Neural tube defect

2

0.9

Major aplasia of the ear^g

2

0.9

Hydrocephalus + clubfoot

2

0.9

Sexual ambiguities + limb deformity

2

0.9

VACTERL association^h

2

0.9

Cyclopiaⁱ

1

0.5

Labio-palatal cleft + microcephaly

1

0.5

Hydrocephalus + Labio-palatal cleft + phocomelia

1

0.5

Hydrocephalus + Sexual ambiguities

1

0.5

Thoracoabdominal ectopia^j

1

0.5

Achondroplasia^k

1

0.5

Ethmocephaly^l

1

0.5

Potter sequence^m

1

0.5

Anophthalmia + arhinia + astoma

1

0.5

Arthrogryposis syndromeⁿ

1

0.5

Trisomy 18^o

1

0.5

Other polymalformations

6

Total

56