Overlap of Moebius and oromandibular limb hypogenesis syndrome with gastroschisis and pulmonary hypoplasia

Oromandibular Limb Hypogenesis Syndrome: Overlap of Moebius and Ankyloglossia Superior With Severe Limb Defects

The oromandibular limb hypogenesis syndromes (OLHS) represent a group of rare conditions characterized by congenital malformations involving the tongue, mandible, and limbs. In this report, we describe a newborn girl with paralysis of abducens and facial nerves, transverse agenesis of the distal segments of the limbs, micrognathia, cleft lip and palate, and ankyloglossia superior. This observation confirms an overlap between Moebius syndrome and ankyloglossia superior syndrome with severe limb defects. The etiology of the OLHS is not clearly understood. The intriguing link between facial and limb anomalies can result from their simultaneous development from the fourth to eighth week of gestation, making both areas susceptible to the same teratogenic stimuli. There is an overlap between OLHS conditions, supporting a clustering, rather than a divided nosology and requiring an appropriate classification of these conditions. Patients with OLHS can be successfully managed using a multidisciplinary approach.

Syngnathia in Spectrum of Oromandibular Limb Hypogenesis Syndrome

Syngnathia is a rare facial anomaly associated with neonatal problems, including a compromised airway, and the inability to take in solids and/or liquids. Syngnathia is included within the spectrum of oromandibular limb hypogenesis syndrome, an extremely rare condition characterized by varying degrees of congenital malformation involving the tongue, mandible, and limbs. In this report, we describe the case of a 41-day-old Caucasian female infant who was unable to open her mouth beginning at birth. The authors performed osteotomies to separate fused bone, and placed a bite block at the osteotomy sites to prevent bone fusion recurrence. At 2 years of follow-up patient remained with 14 mm of mouth opening.

A clinical-pathogenetic approach on associated anomalies and chromosomal defects supports novel candidate critical regions and genes for gastroschisis

BACKGROUND

Gastroschisis has been assumed to have a low rate of syndromic and primary malformations. We aimed to systematically review and explore the frequency and type of malformations/chromosomal syndromes and to identify significant biological/genetic roles in gastroschisis.

METHODS

Population-based, gastroschisis-associated anomalies/chromosomal defects published 1950-2018 (PubMed/MEDLINE) were independently searched by two reviewers. Associated anomalies/chromosomal defects and selected clinical characteristics were subdivided and pooled by race, system/region, isolated, and associated cases (descriptive analysis and chi-square test were performed). Critical regions/genes from representative chromosomal syndromes including an enrichment analysis using Gene Ontology Consortium/Panther Classification System databases were explored. Fisher's exact test with False Discovery Rate multiple test correction was performed.

RESULTS

Sixty-eight articles and 18525 cases as a base were identified (prevalence of 17.9 and 3% for associated anomalies/chromosomal defects, respectively). There were 3596 associated anomalies, prevailing those cardiovascular (23.3%) and digestive (20.3%). Co-occurring anomalies were associated with male, female, American Indian, Caucasian, prenatally diagnosed, chromosomal defects, and mortality (P < 0.00001). Gene clusters on 21q22.11 and 21q22.3 (KRTAP), 18q21.33 (SERPINB), 18q22.1 (CDH7, CDH19), 13q12.3 (FLT1), 13q22.1 (KLF5), 13q22.3 (EDNRB), and 13q34 (COL4A1, COL4A2, F7, F10) were significantly related to biological processes: blood pressure regulation and/or vessel integrity, angiogenesis, coagulation, cell-cell and/or cell-matrix adhesion, dermis integrity, and wound healing (P < 0.05).

CONCLUSIONS

Our findings suggest that gastroschisis may result from the interaction of several chromosomal regions in an additive manner as a pool of candidate genes were identified from critical regions supporting a role for vascular disruption, thrombosis, and mesodermal deficiency in the pathogenesis of gastroschisis.

Associated malformations and the "hidden mortality" of gastroschisis

BACKGROUND

Little is known about associated anomalies in fetuses with gastroschisis (GS) who experience an "atypical perinatal event," defined as spontaneous abortion, stillbirth, termination, or death within 24 hours of birth.

PURPOSE

This study aims to compare associated malformation rates in an atypical perinatal event cohort vs newborns with GS surviving longer than 24 hours.

METHODS

A national prospective GS database was analyzed for cases with an atypical perinatal event. Associated anomaly rates were compared between this cohort and babies surviving longer than 24 hours.

RESULTS

Twenty-three atypical perinatal events (2 spontaneous abortions, 7 stillbirths, 11 terminations, and 3 deaths within 24 hours) were identified from 529 total GS cases. Autopsies in 14 (61%) of 23 identified at least 1 anomaly (excluding intestinal, patent ductus arteriosus, and undescended testicle) in 11 (78.6%) and a "lethal" anomaly in 4 (36%). The associated anomaly rate in newborns surviving longer than 24 hours was 7.3% (37/506; P < .0001). The anomalies in the atypical perinatal event cohort were musculoskeletal (35%), cardiac, central nervous system, pulmonary, and genitourinary (12% each). Among survivors, the most common anomalies were cardiac (38%), genitourinary (32%), musculoskeletal (16%), and central nervous system (8%).

CONCLUSION

Rates of associated anomalies are significantly higher in fetuses experiencing atypical perinatal events and may represent the "hidden mortality" of GS.

Oromandibular-limb Hypogenesis Syndrome Type II C: A Rare Case

The oromandibular-limb hypogenesis syndrome comprises a group of anomalies which simultaneously affect the mandible, tongue, and maxilla with or without reductive limb anomalies. It is characterized by failure of development of the intraoral region and distal extremities. Multiple and variable deformities of the mandible, maxilla and tongue may occur in combination with a variety of limb defects. The wide range of presentation and combination of anomalies make classification difficult. They usually feature primarily in sporadic case reports because of their low incidence. The genetic origin of this syndrome is uncertain. It is congenital and there seems to be no sex predilection. The key radiographic features are retruded mandible, impacted teeth and malformed phalanges. When compared to available literature, frequently reported features like hypodontia, hypoglossia, microstomia, protruded maxilla and limb anomalies were present in our case. The case presented here is one of the rarest subtypes of this rare syndrome.