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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Am+J+Med+Genet+C+Semin+Med+Genet
2011 ; 157C
(4
): 344-57
Nephropedia Template TP
gab.com Text
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Cyclopia: an epidemiologic study in a large dataset from the International
Clearinghouse of Birth Defects Surveillance and Research
#MMPMID22006661
Orioli IM
; Amar E
; Bakker MK
; Bermejo-Sánchez E
; Bianchi F
; Canfield MA
; Clementi M
; Correa A
; Csáky-Szunyogh M
; Feldkamp ML
; Landau D
; Leoncini E
; Li Z
; Lowry RB
; Mastroiacovo P
; Morgan M
; Mutchinick OM
; Rissmann A
; Ritvanen A
; Scarano G
; Szabova E
; Castilla EE
Am J Med Genet C Semin Med Genet
2011[Nov]; 157C
(4
): 344-57
PMID22006661
show ga
Cyclopia is characterized by the presence of a single eye, with varying degrees
of doubling of the intrinsic ocular structures, located in the middle of the
face. It is the severest facial expression of the holoprosencephaly (HPE)
spectrum. This study describes the prevalence, associated malformations, and
maternal characteristics among cases with cyclopia. Data originated in 20
Clearinghouse (ICBDSR) affiliated birth defect surveillance systems, reported
according to a single pre-established protocol. A total of 257 infants with
cyclopia were identified. Overall prevalence was 1 in 100,000 births (95%CI:
0.89-1.14), with only one program being out of range. Across sites, there was no
correlation between cyclopia prevalence and number of births (r = 0.08; P = 0.75)
or proportion of elective termination of pregnancy (r = -0.01; P = 0.97). The
higher prevalence of cyclopia among older mothers (older than 34) was not
statistically significant. The majority of cases were liveborn (122/200; 61%) and
females predominated (male/total: 42%). A substantial proportion of cyclopias
(31%) were caused by chromosomal anomalies, mainly trisomy 13. Another 31% of the
cases of cyclopias were associated with defects not typically related to HPE,
with more hydrocephalus, heterotaxia defects, neural tube defects, and preaxial
reduction defects than the chromosomal group, suggesting the presence of
ciliopathies or other unrecognized syndromes. Cyclopia is a very rare defect
without much variability in prevalence by geographic location. The heterogeneous
etiology with a high prevalence of chromosomal abnormalities, and female
predominance in HPE, were confirmed, but no effect of increased maternal age or
association with twinning was observed.