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Congenital malposition of nasal turbinate — Clinical Guidelines

Overview

Congenital malposition of the nasal turbinate, specifically involving the cephalic malposition of the lateral crura of the lower lateral cartilages, is a significant anatomical variation that impacts both the aesthetic and functional aspects of the nose. This condition often manifests as nasal tip deformities such as bulbosity, parenthesis deformity, and nostril asymmetry, leading to decreased patient satisfaction and potential nasal obstruction. It is commonly encountered in rhinoplasty patients but can also affect individuals without prior surgical intervention. Understanding and addressing this malposition is crucial for achieving optimal outcomes in both aesthetic and reconstructive nasal surgeries, making it a vital consideration in day-to-day practice for otolaryngologists and plastic surgeons 1 2 3 5.

Pathophysiology

The pathophysiology of cephalic malposition of the lateral crura revolves around the altered orientation and positioning of the lower lateral cartilages, which form the structural framework of the nasal tip. Normally, the lateral crura should align laterally, contributing to a balanced nasal tip projection and contour. However, when these crura are positioned too far forward (cephalically malpositioned), they disrupt the natural tripod support system of the nasal tip, leading to deformities such as bulbosity and parenthesis deformity 1. This malposition can depress the nasal valve, causing functional issues like nasal obstruction, and aesthetically, it results in asymmetries and an unnatural tip shape. The vertical orientation of the short axis of the lateral crura does not significantly differentiate noses with parenthesis deformity from those without, suggesting that the primary issue lies in the long-axis orientation and projection rather than the vertical alignment 1.

Epidemiology

While specific incidence and prevalence figures for congenital malposition of the nasal turbinate are not extensively documented in the provided sources, certain trends emerge. Studies indicate that cephalic malposition of the lateral crura is relatively common, affecting a notable proportion of patients undergoing rhinoplasty. In one cadaver study involving Caucasian noses, approximately 37% of lateral crura were found to be malpositioned (≤30° angle with the midline) 1. Additionally, secondary rhinoplasty patients exhibit a higher frequency of alar cartilage malposition compared to primary rhinoplasty patients, suggesting that initial surgical interventions may sometimes exacerbate or reveal underlying anatomical issues 5. Geographic and ethnic variations are less explored in the given sources, but the studies predominantly focus on Caucasian populations, indicating a need for broader demographic studies to understand global prevalence.

Clinical Presentation

Patients with congenital malposition of the nasal turbinate typically present with a combination of aesthetic and functional complaints. Aesthetically, common presentations include nasal tip bulbosity, parenthesis deformity (a characteristic indentation or "parenthesis" at the nasal tip), nostril asymmetry, and alar collapse 1 2. Functionally, these deformities can lead to nasal obstruction, particularly due to compromised nasal valve function 2. Red-flag features that warrant further investigation include severe nasal obstruction impacting daily activities, recurrent sinusitis, or significant asymmetry that affects breathing patterns. Accurate clinical assessment often requires a thorough physical examination, including nasal endoscopy and photographic documentation to evaluate the extent of deformity 2.

Diagnosis

The diagnosis of cephalic malposition of the lateral crura involves a comprehensive clinical evaluation complemented by specific diagnostic criteria and techniques. Diagnostic Approach:

Physical Examination: Detailed inspection of the nasal tip for bulbosity, parenthesis deformity, and nostril asymmetry.

Nasal Endoscopy: To assess internal nasal structures and valve function.

Photographic Documentation: Essential for preoperative planning and postoperative assessment.

Specific Criteria and Tests:

Angle Measurement: Intraoperative measurement of the angle between the lateral crura and the midline using a goniometer; an angle ≤30° indicates malposition 2.

Cadaver Studies: Reference to cadaveric studies can provide normative data for comparison 1.

Differential Diagnosis:

- Nasal Valve Collapse: Distinguished by dynamic obstruction during nasal airflow assessment. - Alar Cartilage Fractures: Identified by history of trauma and specific deformities not explained by malposition alone. - Previous Rhinoplasty Complications: History of prior surgeries can indicate iatrogenic deformities 5.

Management

The management of congenital malposition of the nasal turbinate focuses on correcting both aesthetic and functional issues through surgical intervention. First-Line Treatment:

Lateral Crural Repositioning: Repositioning the lateral crura to their optimal orientation using techniques such as lateral strut grafting to restore nasal tip projection and symmetry 2.

Tip-Plasty Techniques: Utilizing maneuvers like columellar strut grafts, lateral crural overlay, and hinge release to address deformities effectively 3.

Second-Line Treatment:

Combined Procedures: Incorporating additional maneuvers such as supratip transposition flaps for complex deformities like pollybeak and dimpling 4.

Customized Grafts: Tailored use of cartilage grafts to support and reshape the nasal framework 5.

Refractory Cases / Specialist Escalation:

Referral to Specialists: Complex cases may require consultation with experienced rhinoplasty surgeons or otolaryngologists for advanced reconstructive techniques.

Multidisciplinary Approach: Collaboration with maxillofacial surgeons for comprehensive nasal reconstruction in severe deformities 5.

Specific Techniques and Considerations:

Lateral Strut Grafting: Placement of grafts to stabilize and reposition the lateral crura 2.

Columellar Support: Ensuring adequate support to prevent postoperative collapse 3.

Patient Selection: Careful preoperative assessment to identify candidates most likely to benefit from surgical correction 5.

Complications

Common complications following surgical correction of cephalic malposition include:

Nasal Obstruction: Persistent or worsening obstruction if valve function is not adequately restored.

Asymmetry: Residual or new asymmetries requiring revision surgery.

Scarring and Tissue Reaction: Potential for hypertrophic scarring or graft rejection.

Minor Flap Revisions: Some patients may require minor adjustments to achieve optimal results 4.

Management Triggers:

Persistent Symptoms: Immediate referral for reassessment if nasal obstruction or aesthetic concerns persist post-surgery.

Complications Monitoring: Regular follow-up to monitor for signs of graft rejection or scar formation, necessitating timely intervention 4.

Prognosis & Follow-up

The prognosis for patients undergoing correction of cephalic malposition of the lateral crura is generally favorable, with significant improvements in both aesthetics and function observed. Prognostic indicators include the severity of initial deformity, patient-specific anatomical factors, and the skill level of the surgeon. Recommended follow-up intervals typically involve:

Immediate Postoperative: Within 1 week for initial assessment.

3-6 Months: To evaluate early outcomes and address any immediate complications.

1 Year: Final assessment to confirm long-term stability and patient satisfaction 2 4.

Special Populations

Pediatrics

In pediatric patients, congenital malposition may present earlier and require careful surgical planning to avoid growth disturbances. Early intervention should be approached cautiously, considering the ongoing nasal development 5.

Secondary Rhinoplasty Patients

Secondary rhinoplasty patients often present with more complex deformities due to previous surgeries, necessitating a more nuanced approach and potentially more extensive corrective measures 5.

Ethnic Variations

While the provided studies predominantly focus on Caucasian populations, broader ethnic studies are needed to understand variations in anatomical predispositions and surgical outcomes across different ethnic groups 1 5.

Key Recommendations

Preoperative Assessment: Conduct thorough preoperative evaluation including angle measurement of lateral crura with midline using a goniometer (≤30° indicates malposition) 2.

Surgical Correction: Employ lateral crural repositioning with lateral strut grafting for both aesthetic and functional improvement 2.

Customized Techniques: Tailor surgical techniques based on individual patient anatomy and deformity complexity 3 5.

Postoperative Monitoring: Schedule regular follow-ups at 1 week, 3-6 months, and 1 year to assess outcomes and manage complications 2 4.

Referral for Complex Cases: Consider specialist referral for patients with severe or refractory deformities 5.

Patient Education: Inform patients about potential complications and the importance of postoperative care 4.

Documentation: Maintain detailed photographic and clinical documentation for preoperative planning and postoperative assessment 2.

Multidisciplinary Approach: Collaborate with other specialists when dealing with complex cases involving multiple deformities 5.

Ethnic Considerations: Be aware of potential ethnic variations in anatomical predispositions and tailor surgical approaches accordingly 1 5.

Evidence-Based Techniques: Utilize evidence-supported techniques such as lateral crural overlay and columellar strut grafts for optimal outcomes 3.

(Evidence: Strong) 2 3 4 5 (Evidence: Moderate) 1

References

1 Xavier R, Azeredo-Lopes S, Menger DJ, de Carvalho HC, Spratley J. Cephalic Malposition of the Lateral Crura and Parenthesis Deformity: A Cadaver Study in Caucasians. Aesthetic plastic surgery 2020. link 2 Ilhan AE, Saribas B, Caypinar B. Aesthetic and Functional Results of Lateral Crural Repositioning. JAMA facial plastic surgery 2015. link 3 Sepehr A, Alexander AJ, Chauhan N, Chan H, Adamson PA. Cephalic positioning of the lateral crura: implications for nasal tip-plasty. Archives of facial plastic surgery 2010. link 4 Jung DH, Lin RY, Jang HJ, Claravall HJ, Lam SM. Correction of pollybeak and dimpling deformities of the nasal tip in the contracted, short nose by the use of a supratip transposition flap. Archives of facial plastic surgery 2009. link 5 Constantian MB. The boxy nasal tip, the ball tip, and alar cartilage malposition: variations on a theme--a study in 200 consecutive primary and secondary rhinoplasty patients. Plastic and reconstructive surgery 2005. link

Congenital malposition of nasal turbinate