Fetal abnormalities Flashcards
Inheritance pattern - Marfan’s
Autosomal Dominant
Recurrence rate 50%
Inheritance pattern - Neurofibromatosis
Autosomal Dominant
Recurrence rate 50%
Inheritance pattern - Huntingtons Chorea
Autosomal Dominant
Recurrence rate 50%
Inheritance pattern - von Willebrand’s disease
Autosomal Dominant
Recurrence rate 50%
Inheritance pattern - Polycystic kidney disease with adult onset
Autosomal Dominant
Recurrence rate 50%
Inheritance pattern - PKU
Autosomal Recessive
Recurrence rate 25%
Inheritance pattern - congenital adrenal hyperplasia
Autosomal Recessive
Recurrence rate 25%
Inheritance pattern - Thalassemia
Autosomal Recessive
Recurrence rate 25%
Inheritance pattern - Cystic fibrosis
Autosomal Recessive
Recurrence rate 25%
Inheritance pattern - Galactomsemia
Autosomal Recessive
Recurrence rate 25%
Inheritance pattern - metabolic disorders (tay sachs or mucopolsaccaridosis)
Autosomal Recessive
Recurrence rate 25%
Inheritance pattern - diabetes insipidus
Sex linked
Recurrence rate 50%
Inheritance pattern - hemophilia
Sex linked
Recurrence rate 50%
Inheritance pattern - muscular dystrophy
Sex linked
Recurrence rate 50%
Inheritance pattern - placental sulfatase deficiency
Sex linked
Recurrence rate 50%
Inheritance pattern - Testicular feminization
Sex linked
Recurrence rate 50%
Inheritance pattern - neural tube defect
Multifactorial
3-5%
Inheritance pattern - Anencephaly
Multifactorial
3-5%
Inheritance pattern - Spina bifida
Multifactorial
3-5%
Inheritance pattern - congenital heart disease
Multifactorial
3-5%
Inheritance pattern - mullerian agenesis
Multifactorial
3-5%
Inheritance pattern - endometriosis
Multifactorial
3-5%
Inheritance pattern - trisomy 21
Chromosomal errors
1%
Inheritance pattern - Turner’s Syndrome
Chromosomal errors
1%
SGA, 2 vessel cord, short sternum, overlapping clenched fingers, rocker bottom feet
Trisomy 18 (Edwards)
Recurrence rate of Trisomy 18 (Edwards)
1 in 3,500
Survival rate of Trisomy 18 (Edwards)
<10% survive to 1 year
SGA, facial clefts, ocular anomalies, polydactactly
Trisomy 13 (Patau)
Survival rate of Trisomy 13 (Patau)
1 in 5,000
Survival rate of Trisomy 13
<3% survive to 3 years
High pitched cry “cat cry,” epicanthal fold, mental retardation
5 P (Cri-Du-Chat)
Recurrence rate of Cri-Du-Chat
1 in 20,000
Short stature, web neck (cystic hygroma), pigmented nevi, low posterior hairline, trouble hearing (high arched palate), normal IQ, wide space nipples, increased carrying walk (Omar’s walk), shield chest, streak gonads, coarctation of the aorta, renal anomalies
Turner’s Syndrome
Recurrence rate of Turner’s Syndrome
1 in 3,500
Survival rate of Turner’s syndrome
<10% survive to 1 year
What conditions are associated with high msAFP?
Open NTD (omphalocele, gastroschisis) Congenital nephrosis Cystic hygroma Twins Fetal death Osteogenesis imperfecta
What conditions are associated with low msAFP?
Chromosomal trisomies (13, 18, 21) Gestational trophoblastic dz Fetal death Overestiated gestational age Increased maternal wt
Associated with high or low msAFP? - open NTD
High
Associated with high or low msAFP? - Congential nephrosis
High
Associated with high or low msAFP? - Cystic hygroma
High
Associated with high or low msAFP? - Twins
High
Associated with high or low msAFP? - fetal death
High
Associated with high or low msAFP? - osteogenesis imperfecta
High
Associated with high or low msAFP? - Chromosomal trisomies (13, 18, 21)
Low
Associated with high or low msAFP? - Gestational trophoblastic dz
Low
Associated with high or low msAFP? - fetal death
Low
Associated with high or low msAFP? - overestimated gestational age
Low
Associated with high or low msAFP? - increased maternal wt
Low
Lymphatic lesion in the left posterior triangle of the neck
Cystic hygroma
What conditions is cystic hygroma associated with?
Fetal hydrops
Turner’s Syndrome (45X)
Noonan syndrome