Constrictive amniotic band syndrome, when the embryo gets caught.

Constrictive amniotic band syndrome (CABS) is a rare condition which occurs sporadically and should not be compared with a syndrome as it is known from genetics. However, since the pathogenesis is not yet fully understood, some theories suggest genetics playing a role. Even though CABS is rare it is associated with a high risk of foetal death as seen in 1/70 of these cases. The diagnostics start with ultrasound of the pregnant woman, and if this leads to suspicion of CABS it is possible to supplement with 3D ultrasound or MRI to verify. The treatment involves either in utero or postnatal surgery depending on the case, as argued in this review.

Body wall defects and amniotic band syndrome in pig (Sus scrofa domesticus).

The amniotic band syndrome is a congenital condition. It is characterized by the presence of fibrous amniotic bands that may entangle or entrap different foetal parts in utero, resulting in deformation, malformation or disruption. We report on a female piglet presenting amniotic band adherences in the right abdominal flank, several body wall defects (gastroschisis, abdominoschisis with omphalocele), severe scoliosis, anomalous umbilical cord with single umbilical artery, anal atresia, anomalous liver and absent gall bladder, hypoplastic genitalia, ankylosis and arthrogryposis in pelvic limbs, and bilateral patellar agenesia. The ethiopatogenia is discussed, as well as the comparative and embryological implications.

Expanding the phenotype in Adams-Oliver syndrome correlating with the genotype.

RATIONALE: Adams-Oliver syndrome (AOS) is a genetic disorder characterized by the association of aplasia cutis congenita (ACC), terminal transverse limb defect (TTLD), congenital cardiac malformation (CCM), and minor features, such as cutaneous, neurological, and hepatic abnormalities (HAs). The aim of the study is to emphasize phenotype-genotype correlations in AOS. METHODS: We studied 29 AOS patients. We recorded retrospectively detailed phenotype data, including clinical examination, biological analyses, and imaging. The molecular analysis was performed through whole exome sequencing (WES). RESULTS: Twenty-nine patients (100%) presented with ACC, the principal inclusion criteria in the study. Seventeen of twenty-one (81%) had cutis marmorata telangiectasia congenita, 16/26 (62%) had TTLD, 14/23 (61%) had CCM, 7/20 (35%) had HAs, and 9/27 (33%) had neurological findings. WES was performed in 25 patients. Fourteen of twenty-five (56%) had alterations in the genes already described in AOS. CCM and HAs are particularly associated with the NOTCH1 genotype. TTLD is present in patients with DOCK6 and EOGT alterations. Neurological findings of variable degree were associated sometimes with DOCK6 and NOTCH1 rarely with EOGT. CONCLUSION: AOS is characterized by a clinical and molecular variability. It appears that degrees of genotype-phenotype correlations exist for patients with identified pathogenic mutations, underlining the need to undertake a systematic but adjusted multidisciplinary assessment.

Amniotic band sequence in paternal half-siblings with vascular Ehlers-Danlos syndrome.

Familial amniotic band sequence (ABS) is rare but has been reported in the offspring of mothers with connective tissue disorders. We present a family of two half-siblings with ABS who share the same biological father. Following a serious vascular event a de novo pathogenic variant in COL3A1 was detected in the father, confirming a diagnosis of vascular Ehlers-Danlos syndrome (vEDS). The same variant was found in both his ABS-affected children but not in his unaffected child. The amniotic membrane is derived from fetal tissue, type III collagen being a component. As the affected children are paternal half-siblings, ABS was less likely due to maternal factors. Rather, the amniotic bands may have resulted from decreased type III collagen production as seen in people with vEDS, causing fragility of the amniotic membrane. Consequently, it is important to consider vEDS in patients with ABS.

Septo-optic dysplasia with amniotic band syndrome sequence: a case report.

INTRODUCTION: De Morsier syndrome, or septo-optic dysplasia, is a rare, heterogeneous, complex condition with a highly variable phenotype. It is characterized by optic nerve hypoplasia, pituitary gland hypoplasia, and midline brain abnormalities, including absence of septum pellucidum and corpus callosum dysgenesis. Diagnosis is made clinically by the presence of any two or more features from the clinical triad. CASE PRESENTATION: We report a case of a premature African newborn male baby born to nonconsanguineous parents who presented to our institution with agenesis of the septum pellucidum, unilateral optic nerve hypoplasia, and pituitary stalk hypoplasia. However, he had intact central endocrine function. He also presented with limb defects due to constricting amniotic band syndrome. Other dysmorphic features were low-set ears, microcephaly, and bilateral talipes equinovarus. He otherwise had a normal neurological examination result. Over time, he had an adequate weight gain and was managed by a multidisciplinary team. CONCLUSION: De Morsier syndrome still represents a diagnostic challenge, despite advances in neuroimaging and genetic studies, due to the heterogeneous nature of the disorder. This case adds to existing knowledge on the vascular pathogenesis of septo-optic dysplasia.

Amniotic Constriction Bands: Secondary Deformities and Their Treatments.

BACKGROUND: The purpose of this study was to report the surgical treatment experience of patients with amniotic constriction bands (ACB) over a 35-year interval and detail consequential limb deformities with emphasis on hands and upper extremities, along with the nature and frequency of their surgical treatment methods. METHODS: Fifty-one patients were identified; 26 were males and 25 females. The total number of deformities was listed. The total number of operations, individual procedures, and operations plus procedures that were done for each patient and their frequency were recorded. RESULTS: The total number of operations was 117, and total number of procedures was 341. More procedures were performed on the upper extremity (85%) than the lower extremity (15%). Including the primary deformity ACB, 16 different hand deformities secondary to ACB were encountered. Sixteen different surgical methods for the upper extremity were utilized; a primary procedure for ACB and secondary reconstructions for all secondary deformities. Average age at the time of the first procedure was 9.3 months. The most common procedures performed, in order of frequency, were excision of ACB plus Z-plasty, release of partial syndactyly, release of fenestrated syndactyly, full-thickness skin grafts, resection of digital bony overgrowth from amputation stumps, and deepening of first and other digital web spaces. CONCLUSIONS: Many hand and upper extremity deformities secondary to ACB are encountered. Children with ACB may require more than one operation including multiple procedures. Numerous surgical methods of reconstruction for these children's secondary deformities are necessary in addition to the customary primary procedure of excision of ACB and Z-plasty.

Limb body wall complex: Its delineation and relationship with amniotic bands using clustering methods.

BACKGROUND: Despite the numerous reports on the limb body wall complex (LBWC), this association has never been adequately defined. Amniotic bands (AB) are frequently present but their role remains unclear. Since most reports were based on clinical and often subjective diagnoses, the aim of this work was to define LBWC and the role of AB, minimizing subjectivity. METHODS: Data were obtained from the ECLAMC maternity hospitals network database. A total of 450 live and stillborn infants, born during 1967-2013, with AB or the LBWC were selected. A hierarchical cluster analysis was used to classify cases into homogeneous groups (sharing similar associated defects); robustness of the classification was confirmed with a discriminant analysis. The frequency of associated defects was compared among groups; those whose frequency differed significantly were included in a logistic regression to establish their association within each group. RESULTS: The cluster analysis identified two groups: a body wall defect (BWD) predominating in one, AB in the other. These groups were further divided into: BWD (cases with only BWD), AB (with only AB), BWD + AB, and NONE (with neither). Association with caudal defects and lower limb amelia was observed for BWD, with cephalic defects and upper limb amputations for BWD + AB. CONCLUSIONS: The results, obtained with the least possible subjectivity, indicated that BWD and BWD + AB are different conditions. Since BWD specifically associates with amelia, we propose that this defect and not any limb deficiency should be considered as inclusion criterium and that it should be included in the BWD acronym as LBWC.

Síndrome de Banda Amniótica / Amniotic Band Syndrome

Amniotic band sequence or syndrome, is the term applied to a wide range of congenital anomalies, as a group of congenital birth defects caused by entrapment of fetal parts (usually a limb or digits) in fibrous amniotic bands while in utero. Before the baby was born, the body parts shows signs of arm, fingers, etc, that were caught and estrangled. Amniotic band syndrome can cause a number of different birth defects depending on which body part(s) is affected. Amniotic band sequence (ABS) is a rare condition caused by strands of the amniotic sac that separate and entrangle digits, limbs or other parts of the fetus. This constriction can cause a variety of problems depending on where the strands are located and how trightly they are wrapped. ABS can cause a broad spectrum of anomalies ranging from simple band constrictions to major craniofacialand visceral defects. This causes deformations, malformation and disruption, that results in incapacity or death. The aims of the present report, were to present a review of the literature concerning with this pathology, describing the clinical characteristics, etiology, diagnosis and prognosis, in order to improve the efficacy of the prenatal management

Malformations attributed to the process of vascular disruption.

BACKGROUND: Several malformations have been attributed to the process of vascular disruption. The central hypothesis for this etiology is that blood flow to a structure has been altered after that structure had formed normally. The decreased blood flow leads to hypoxia, endothelial cell damage, hemorrhage, tissue loss, and repair. After recovery, some structures are normal and others show either tissue loss or structural abnormalities, such as syndactyly and constriction rings. METHODS: The phenotypic features of the 7,020 infants with one or more malformations, who were born to women who had always planned to deliver at Brigham and Women's Hospital (BWH) between, 1972 and 2012, that is, maternal nontransfers, were reviewed. The phenotypes associated with vascular disruption, such as the amniotic band syndrome and terminal transverse limb defects (TTLD), were identified. RESULTS: One hundred and five fetuses and infants had malformations attributed to the process of vascular disruption. Some specific causes of the amniotic band limb deformity were identified. TTLD with associated small digit-like nubbins occurred at three levels: proximal forearm, wrist, and metacarpal-phalangeal joint. Other causes included severe hemoglobinopathies and exposures to misoprostol and to prenatal procedures. CONCLUSIONS: Malformations attributed to the process of vascular disruption were a distinctive entity, among the recognized etiologies. The timing of the causative event in the first trimester was established for infants with exposures to either the prostaglandin misoprostol or the prenatal diagnosis procedure chorionic villus sampling. One challenge is to identify the developmental steps in vascular disruption when no causative exposure can be identified.

Severe Craniofacial Involvement due to Amniotic Band Sequence.

BACKGROUND: Disruptive amniotic band sequence (DABS) is a sporadic, non-familial disorder with unclear etiology. Diagnosis is based on clinical features because there is currently no reliable laboratory diagnostic tests. OBJECTIVE: We describe six cases of DABS with severe craniofacial deformations, three with and three without classical constrictive limb deformation. RESULTS: The craniofacial deformities were delimited by peripheral sharply demarcated scarring. CONCLUSION: When a sharply demarcated linear disruptive craniofacial lesion is observed, DABS should be considered despite the absence of constrictive limb scarring.

Severe Intrauterine Amputations in One Dichorionic Twin With Pentalogy of Cantrell: Further Evidence and Consideration for Mechanical Teratogenesis.

Pentalogy of Cantrell (PC) is characterized by midline supraumbilical abdominal wall defect, lower sternum defect, anterior diaphragmatic and pericardial defect, and congenital cardiac anomalies. Several etiological influences have been postulated, however, most of the reported cases are sporadic. In addition, evidence for mechanical teratogenesis in PC is limited. Here, we describe in one dichorionic twin with complete PC, additional severe intrauterine amputations (mainly head and neck) not previously reported resultant from mechanical teratogenesis. This morphologic constellation prompts us to emphasize the consideration of this etiological influence and provides further evidence. In fact, the pattern of anomalies in the affected fetus provides new insight into the severity and presentation of PC due to mechanical teratogenesis, which is a significant etiological consideration in clinical evaluation and implies that the syndrome involves a complex defective fetal development.

Síndrome de Bartsocas-Papas y secuencia de bridas amnióticas: Semejanzas clínicas sugieren un factor etiopatogénico común / Bartsocas-Papas syndrome and amniotic bands sequence: Clinical similarities suggest a common etiopathogenic factor

Introducción: el síndrome de Bartsocas-Papas (SBP) es una entidad letal causada por una mutación homocigota del gen RIPK4, el cual, formando parte de una compleja red molecular, está involucrado en la diferenciación del queratinocito. Las principales manifestaciones del síndrome, parcialmente compartidas por otras displasias ectodérmicas monogénicas son: pterigium en miembros inferiores, fisuras faciales, defectos de reducción distal de miembros y apéndices cutáneos. Por otro lado, la secuencia de bridas amnióticas (SBA), de etiopatogenia desconocida, se caracteriza por un espectro variable de anomalías consideradas disruptivas, incluyendo fisuras faciales y defectos de reducción de miembros. Objetivo: describir los hallazgos clínicos y anatomopatológicos de un paciente con SBP y de otro con SBA, remarcando sus semejanzas. Casos clínicos: 1) Recién nacida con fisura facial, pterigium poplíteo y crural, reducción de dedos y ortejos, y apéndices cutáneos. Placenta con zonas desprovistas de epitelio amniótico. 2) Feto femenino de 27 semanas, fisura facial atípica, reducción distal de miembros, pterigium poplíteo, defecto de cierre de pared tóracoabdominal y polo cefálico, apéndices cutáneos y presencia de bridas amnióticas. Placenta y cordón umbilical con extensas zonas de desprendimiento del epitelio amniótico. Conclusiones: algunos hallazgos similares en el SBP y la SBA permitirían especular acerca de la existencia de un factor intrínseco, relacionado al desarrollo de la piel, y común a ambas entidades.

Introduction: Bartsocas-Papas syndrome (BPS) is a lethal condition caused by a homozygous mutation of the RIPK4 gene, which, being part of a complex molecular network, is involved in keratinocyte differentiation while. The main clinical manifestations are webbing of lower limbs, facial clefts, distal limb reduction defects, and skin tags, and some of these are shared with other monogenic ectodermal dysplasia syndromes. Similarly, amniotic bands sequence (ABS), a condition of unknown etiopathogenesis, is characterized by a variable spectrum of anomalies considered as disruptive, such as facial clefts and limb reduction defects. Objective: to describe clinical and autopsy findings of a patient with BPS and of a fetus with ABS, emphasizing on their similarities. Case reports: 1. Female liveborn with atypical facial clefts, popliteal and crural webbing, distal reduction defects of hands and feet, and multiple skin tags. The placenta showed regions lacking amniotic epithelium. 2. Female fetus of 27 gestational weeks, atypical facial clefts, distal limb reduction defects, popliteal webbing, thoracoabdominal and cephalic closure defects, skin tags, and amniotic bands. Placenta and umbilical cord showed broad regions lacking amniotic epithelium attachment. Conclusions: the observation of a number of findings with remarkable similarities between BPS and ABS allows considering the existence of an intrinsic factor, involved in skin development which is common to both conditions.

Pseudoamniotic Band Syndrome after In Utero Intervention for Twin-to-Twin Transfusion Syndrome: Case Reports and Literature Review.

Pseudoamniotic band syndrome (PABS) is a rare iatrogenic complication that arises after invasive procedures in monochorionic twins. We report 3 cases of PABS, 2 after fetoscopic laser photocoagulation and 1 after bipolar cord coagulation. Two cases were detected antenatally by ultrasound; out of the two, one underwent successful fetoscopic release of amniotic band, which is the first report in twin pregnancy to our knowledge. In our centre, the incidence of PABS was found to be 2%. There were 25 cases of PABS reported previously, of which 12 cases with clinical details were reviewed together with our 3 cases. The fetal limbs were involved in all 15 cases, leading to constriction or amputation. The umbilical cord was involved in 2 cases, resulting in fetal death in one and pregnancy termination in the other. Antenatal detection of PABS is rare (27%; 4/15) as this requires a high index of suspicion. Serial postoperative targeted ultrasound surveillance of the fetal limbs and umbilical cord is necessary, particularly when features of septostomy or chorioamniotic membrane separation are found. Colour Doppler examination for the perfusion of the affected limb should be performed when PABS is detected. Fetoscopic release of amniotic band could salvage the fetal limb from amputation when impaired blood flow is detected.

Two-stage release in Streeter's dysplasia.

Streeter's dysplasia is a rare disorder of congenital constricting bands, occurring in 1-10 000 birth, with no sex predilection. In severe cases, it is associated with autoamputation of distal extremities such as fingers and toes. Recent advances have made it possible, in developed countries, to recognise this condition in the prenatal period and to initiate prompt intrauterine management, however, these, being uncommon procedures, need technical advances and experienced hands. In developing countries, recognition of the condition with timely management of primary and associated abnormalities required. We present a case of a 4-month-old child with type IV Streeter's dysplasia associated with right flexible clubfoot, who underwent successful two-stage release of symptomatic constricting bands from bilateral legs.

An unusual craniofacial cleft: amniotic band syndrome as a possible cause.

We report the case of a no. 4 Tessier cleft in association with an unknown cleft of the mandible extending to the external auditory meatus. This has not been previously published in the literature and its underlying pathology remains undetermined. The nature of the cleft, possible classifications, and potential embryologic origins will be discussed. Amniotic band syndrome is the most likely cause of the cleft.