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

Area of Science:

• Genetics and Developmental Biology
• Craniofacial Anomalies
• Limb Malformations

Background:

• Oromandibular-limb hypogenesis syndrome (OMIMHS) is a rare congenital disorder characterized by anomalies affecting the mandible, tongue, and maxilla, often with limb defects.
• The syndrome presents with a wide range of deformities, making classification challenging and leading to its frequent reporting in sporadic case studies due to low incidence.
• The exact genetic etiology of OMIMHS remains uncertain, and it typically manifests without a discernible sex predilection.

Observation:

• The case presented exhibits a rare subtype of OMIMHS, featuring simultaneous intraoral and distal extremity developmental failures.
• Key radiographic findings included a retruded mandible, impacted teeth, and malformed phalanges, consistent with reported features of the syndrome.
• Observed anomalies in this case included hypodontia, hypoglossia, microstomia, protruded maxilla, and limb anomalies, aligning with frequently reported manifestations.

Findings:

• The study details a rare presentation of oromandibular-limb hypogenesis syndrome, underscoring the variability in its clinical and radiographic features.
• Simultaneous occurrence of intraoral hypogenesis (hypoglossia, microstomia, mandibular and maxillary anomalies) and limb hypogenesis was noted.
• Radiographic analysis confirmed characteristic features such as mandibular hypoplasia, dental anomalies, and phalangeal malformations.

Implications:

• This case report contributes to the understanding of the phenotypic spectrum and rarity of oromandibular-limb hypogenesis syndrome subtypes.
• Further research into the genetic underpinnings of OMIMHS is warranted to improve diagnosis and potential therapeutic strategies.
• Recognizing the diverse presentations of OMIMHS is crucial for accurate diagnosis and management of affected individuals, particularly regarding craniofacial and limb development.