Q75.4

Clinical Causes: Genetic mutations affecting the development of facial bones and tissues Inheritance in an autosomal dominant pattern, meaning only one copy of the altered gene is sufficient to cause the disorder Certain genetic mutations involving the TCOF1 gene are most commonly associated with Treacher Collins syndrome New mutations can also occur, resulting in the disorder even if there is no family history

Key Symptoms: Underdeveloped facial bones, especially the cheekbones and jaw Downward-slanting eyes with skin folds extending to the cheeks Notched or deformed lower eyelids Absent or underdeveloped lhe upper and lower jaws, leading to breathing difficulties and feeding issues Malformed or absent ears, often leading to hearing loss Dental anomalies, including missing, misaligned, or extra teeth Narrow nasal passages with possible breathing problems Highly variable severity of facial features among individuals

Diagnosis Path: Diagnosis is typically based on physical examination and characteristic facial features observable at birth or in early childhood. Genetic testing can identify mutations in the TCOF1 gene, confirming the diagnosis. Imaging studies like X-rays or CT scans may be used to assess bony abnormalities. A comprehensive clinical assessment may involve audiological tests for hearing and evaluation of breathing and feeding difficulties. Early diagnosis allows for planning appropriate interventions and supportive care to improve quality of life.

Treatment Protocols: Management involves a multidisciplinary team approach, focusing on addressing specific health issues and improving appearance. Treatment options may include: - Surgical procedures to correct facial bone abnormalities and improve breathing, feeding, or hearing - Ear reconstruction or hearing aids for hearing impairments - Dental interventions to address alignment and missing teeth - Speech therapy to support communication skills - Ongoing evaluation and support by specialists in genetics, ENT, maxillofacial surgery, dentistry, and audiology While there is no cure for mandibulofacial dysostosis, early intervention and tailored care can significantly enhance functional and aesthetic outcomes, helping affected individuals lead more comfortable and confident lives.