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Non cavitated coronal lesion — Clinical Guidelines

Overview

Non cavitated coronal lesions, often observed in the context of unilateral coronal synostosis (UCS), represent subtle asymmetries or deformities in the frontal and orbital regions that do not exhibit overt bony cavitation. These lesions are clinically significant due to their potential impact on facial symmetry, cranial development, and psychological well-being, particularly in pediatric patients. UCS predominantly affects infants and young children, with a slight male predominance. Early identification and intervention are crucial as these lesions can influence long-term craniofacial development and aesthetic outcomes. Understanding and managing these lesions effectively is essential for clinicians to ensure optimal surgical outcomes and patient satisfaction in day-to-day practice. 1 3 6

Pathophysiology

Unilateral coronal synostosis results from premature fusion of the coronal suture, leading to asymmetrical growth and development of the affected side of the skull. This premature synostosis disrupts the normal growth pattern, causing compensatory overgrowth on the contralateral side and resultant facial and cranial asymmetry. At the molecular level, aberrant signaling pathways involving fibroblast growth factors (FGFs) and their receptors play a critical role in suture closure and craniofacial morphogenesis. The lack of suture patency impedes the normal expansion of the cranial base and orbits, contributing to the characteristic flattening and retrusion of the supraorbital rim and orbital dystopia. Additionally, the altered growth dynamics can affect midface development, leading to persistent asymmetries even after surgical correction. These pathophysiological mechanisms underscore the complexity of managing non cavitated coronal lesions, necessitating comprehensive surgical approaches that address both structural deformities and functional outcomes. 1 3 7

Epidemiology

Unilateral coronal synostosis, and consequently non cavitated coronal lesions, typically present in early infancy, with an incidence ranging from about 1 in 5,000 to 1 in 10,000 live births. Males are affected more frequently than females, with a male-to-female ratio often reported around 3:1. Geographic distribution does not show significant variations, suggesting a consistent prevalence across different regions. Over time, there has been a trend towards earlier diagnosis and intervention due to improved prenatal and neonatal imaging techniques, allowing for timely surgical corrections that mitigate long-term deformities. However, the long-term outcomes and the persistence of subtle asymmetries like non cavitated lesions remain areas of ongoing research and clinical focus. 1 6 7

Clinical Presentation

Patients with unilateral coronal synostosis often present with characteristic clinical features including a flattened forehead on the affected side, a retruded supraorbital rim, and orbital dystopia leading to facial asymmetry. Additional signs may include a deviated nasal bridge, asymmetry in the position of the ears, and subtle differences in the midface projection. Red-flag features include significant respiratory distress, developmental delays, or neurological symptoms, which may indicate more severe underlying issues requiring immediate attention. Early detection through routine pediatric examinations and imaging studies like CT scans is crucial for timely intervention. 1 3 6

Diagnosis

The diagnosis of non cavitated coronal lesions typically involves a combination of clinical assessment and advanced imaging techniques. Clinicians should perform a thorough physical examination focusing on craniofacial symmetry, orbital alignment, and nasal morphology. Essential diagnostic tools include:

Computed Tomography (CT) Scans: Essential for detailed assessment of bony structures, measuring symmetry ratios such as supraorbital distance, midfacial angles, and endocranial angulation. Specific cutoffs include:

- Supraorbital distance ratio: Symmetry typically aimed at >0.95 post-surgery 1 - Midface angulation: Reduction from preoperative values (e.g., from 6.6 ± 2.2 degrees to 2.6 ± 1.9 degrees) 3 - Endocranial angulation: Improvement towards normal values (e.g., from 167.5 ± 5.0 degrees to 174.4 ± 3.4 degrees) 1

Three-Dimensional Photogrammetry: Useful in assessing soft tissue asymmetries in older patients, measuring distances like medial canthus to facial midline, middle facial depth, and lower facial depth 6

Differential Diagnosis: Conditions to consider include:

- Craniosynostosis syndromes (e.g., Apert syndrome) – distinguished by additional syndromic features 1 - Developmental plagiocephaly – often less severe and may involve lambdoid suture involvement 3 - Post-traumatic deformities – history of trauma can help differentiate 6

(Evidence: Moderate) 1 3 6

Management

Fronto-Orbital Advancement (FOA)

First-Line Approach: Fronto-orbital advancement (FOA) is a primary surgical intervention aimed at correcting bony asymmetries and improving facial symmetry. Key aspects include:

Indications: Infants with unilateral coronal synostosis presenting with significant craniofacial asymmetry.

Procedure: Combined advancement of the frontal bone and orbital structures, often with distraction osteogenesis.

Post-Operative Care: Use of custom-molded helmets to maintain correction and promote proper remodeling.

Monitoring: Regular follow-up imaging (CT scans) to assess symmetry ratios and adjust treatment as needed.

Endoscopic Strip Craniectomy (ESC) with Helmet Therapy

Alternative Approach: For older infants or those with less severe deformities, endoscopic strip craniectomy (ESC) combined with helmet therapy can be effective.

Indications: Patients older than 4 months with less severe asymmetry.

Procedure: Minimally invasive removal of fused suture with subsequent helmet therapy to guide cranial reshaping.

Helmet Therapy: Custom-molded helmets worn for several months to ensure proper skull reshaping.

Monitoring: Periodic anthropometric measurements and imaging to evaluate symmetry and growth patterns.

Specific Techniques for Nasal Asymmetry

Nasal Correction: Addressing nasal asymmetry requires precise surgical techniques:

Ex Vivo Repositioning: Complete dissection of nasal bones for repositioning, suitable for severe cases.

In Vivo Repositioning: Subperiosteal dissection limited to osteotomy sites, preserving nasal cartilage continuity, ideal for moderate asymmetry.

Post-Operative Assessment: Nasal angulation measured preoperatively and at 1-year follow-up to ensure correction.

Non-Surgical Interventions

Rehabilitation and Aesthetic Treatments: For residual soft tissue asymmetries:

Radiofrequency Therapy: Devices like ThermaCool TC system can tighten lower facial tissues, improving contour without surgery.

High-Intensity Focused Ultrasound (HIFU): Emerging for non-invasive body contouring but not yet extensively validated for craniofacial asymmetries.

Contraindications: Severe systemic comorbidities, contraindications to anesthesia, or significant craniofacial syndromes where surgical correction might not suffice alone.

(Evidence: Strong for FOA and ESC; Moderate for non-surgical interventions) 1 3 4 9

Complications

Surgical Complications

Immediate Postoperative: Infection, wound dehiscence, hardware complications (in cases involving distraction osteogenesis).

Long-Term: Residual asymmetry, cranial deformities, and potential need for secondary surgeries.

Management Triggers

Infection: Elevated inflammatory markers, fever, localized tenderness; prompt antibiotic therapy and wound care.

Asymmetry Persistence: Regular follow-up imaging and anthropometric measurements; consider secondary surgical interventions if significant asymmetry persists.

When to Refer

Complex Cases: Involvement of multiple craniofacial structures or syndromic features.

Psychological Impact: Significant psychosocial concerns requiring multidisciplinary support including psychologists and social workers.

(Evidence: Moderate) 1 3 6

Prognosis & Follow-Up

The prognosis for patients with non cavitated coronal lesions following surgical correction is generally favorable, with significant improvements in craniofacial symmetry observed in the majority of cases. Key prognostic indicators include:

Severity of Preoperative Asymmetry: Less severe preoperative deformities tend to have better long-term outcomes.

Timing of Intervention: Earlier surgical correction often leads to better symmetry and fewer complications.

Recommended Follow-Up:

Immediate Postoperative: Weekly for the first month, then monthly for the first year.

Long-Term: Annual evaluations with CT scans and anthropometric measurements to monitor symmetry and growth patterns.

Adolescent and Adult Follow-Up: Focus on soft tissue asymmetries and potential need for aesthetic interventions like radiofrequency therapy.

(Evidence: Moderate) 1 3 6

Special Populations

Pediatric Patients

Considerations: Early intervention is crucial; multidisciplinary teams including pediatric neurosurgeons, craniofacial surgeons, and pediatricians are essential.

Follow-Up: More frequent monitoring in early years to ensure proper growth and symmetry correction.

Adolescents and Adults

Focus: Soft tissue asymmetries and aesthetic outcomes; non-surgical interventions like radiofrequency therapy may be considered.

Psychosocial Support: Addressing long-term psychological impacts and cosmetic concerns.

Comorbidities

Impact: Systemic conditions like syndromic craniosynostosis may complicate surgical outcomes; tailored multidisciplinary approaches are necessary.

Management: Close collaboration with specialists managing comorbid conditions to optimize surgical timing and outcomes.

(Evidence: Moderate) 1 3 6 9

Key Recommendations

Early Surgical Intervention: Perform fronto-orbital advancement (FOA) or endoscopic strip craniectomy (ESC) in infants with unilateral coronal synostosis to achieve optimal craniofacial symmetry. (Evidence: Strong) 1 3

Detailed Preoperative Imaging: Utilize CT scans to quantify preoperative asymmetry ratios and guide surgical planning. (Evidence: Strong) 1 3

Post-Operative Helmet Therapy: Implement custom-molded helmets post-FOA to maintain correction and promote proper cranial remodeling. (Evidence: Strong) 1

Regular Follow-Up: Schedule annual follow-up evaluations with CT scans and anthropometric measurements to monitor long-term outcomes. (Evidence: Moderate) 6

Address Nasal Asymmetry Precisely: Employ specific surgical techniques (ex vivo or in vivo repositioning) tailored to the degree of nasal deviation. (Evidence: Moderate) 4

Consider Non-Surgical Aesthetic Interventions: For residual soft tissue asymmetries in older patients, radiofrequency therapy can be effective. (Evidence: Moderate) 9

Multidisciplinary Approach: Involve pediatricians, neurosurgeons, and craniofacial specialists for comprehensive care, especially in complex cases. (Evidence: Expert opinion) 1 3

Psychosocial Support: Provide psychological support and counseling to address long-term psychosocial impacts of craniofacial asymmetry. (Evidence: Expert opinion) 1 3

Monitor for Complications: Regularly assess for signs of infection, asymmetry persistence, and other complications requiring timely intervention. (Evidence: Moderate) 1 3

Tailored Management for Syndromic Cases: For patients with syndromic craniosynostosis, individualized treatment plans addressing multiple craniofacial anomalies are crucial. (Evidence: Moderate) 1 7

References

1 Park H, Min J, Choi JW, Ra YS. Facial and Cranial Symmetry after One-Piece Fronto-Orbital Advancement with Distraction for Isolated Unilateral Coronal Synostosis. Plastic and reconstructive surgery 2023. link 2 Atiyeh BS, Chahine F. Evidence-Based Efficacy of High-Intensity Focused Ultrasound (HIFU) in Aesthetic Body Contouring. Aesthetic plastic surgery 2021. link 3 Liu MT, Khechoyan DY, Susarla SM, Skladman R, Birgfeld CB, Gruss JS et al.. Evolution of Bandeau Shape, Orbital Morphology, and Craniofacial Twist after Fronto-Orbital Advancement for Isolated Unilateral Coronal Synostosis: A Case-Control Study of 2-Year Outcomes. Plastic and reconstructive surgery 2019. link 4 Chepla KJ, Alleyne BJ, Gosain AK. Primary correction of nasal asymmetry in patients with unilateral coronal synostosis. Plastic and reconstructive surgery 2014. link 5 Tan SP, Proctor MR, Mulliken JB, Rogers GF. Early frontofacial symmetry after correction of unilateral coronal synostosis: frontoorbital advancement vs endoscopic strip craniectomy and helmet therapy. The Journal of craniofacial surgery 2013. link 6 Oh AK, Wong J, Ohta E, Rogers GF, Deutsch CK, Mulliken JB. Facial asymmetry in unilateral coronal synostosis: long-term results after fronto-orbital advancement. Plastic and reconstructive surgery 2008. link 7 Farkas LG, Forrest CR. Changes in anthropometric values of paired craniofacial measurements of patients with right coronal synostosis. Annals of plastic surgery 2006. link 8 Knoll BI, Shin J, Persing JA. The bowstring canthal advancement: a new technique to correct the flattened supraorbital rim in unilateral coronal synostosis. The Journal of craniofacial surgery 2005. link 9 Hsu TS, Kaminer MS. The use of nonablative radiofrequency technology to tighten the lower face and neck. Seminars in cutaneous medicine and surgery 2003. link

Non cavitated coronal lesion

Overview

Pathophysiology

Epidemiology

Clinical Presentation

Diagnosis

Management

Fronto-Orbital Advancement (FOA)

Endoscopic Strip Craniectomy (ESC) with Helmet Therapy

Specific Techniques for Nasal Asymmetry

Non-Surgical Interventions

Complications

Surgical Complications

Management Triggers

When to Refer

Prognosis & Follow-Up

Special Populations

Pediatric Patients

Adolescents and Adults

Comorbidities

Key Recommendations

References

Original source