Comparative Analysis of ESITA Versus EEMP for AITF and PPF Lesions

Overview

This study compares the Extradural Subtemporal Infratemporal Approach (ESITA) and the Endonasal Endoscopic Transmaxillary Transpterygoid (EEMP) approach for lesions in the anterior infratemporal fossa (AITF) and pterygopalatine fossa (PPF). ESITA provides superior resection volume and surgical freedom for AITF lesions, while EEMP offers better exposure and resection for PPF pathology with fewer major complications.

Background

Surgical access to the anterior infratemporal fossa and pterygopalatine fossa is challenging due to complex anatomy and proximity to critical neurovascular structures. ESITA and EEMP are established surgical routes that differ in approach and exposure. Quantitative comparison of these techniques can guide optimal surgical planning and improve clinical outcomes. This study uses cadaveric dissections and clinical case reviews to evaluate operative exposure, surgical freedom, angles of attack, and morbidity associated with each approach.

Data Highlights

Key Findings

• ESITA achieves significantly greater resection volume in the anterior infratemporal fossa compared to EEMP (92% vs 78.7%, p=0.043).
• EEMP provides complete resection volume in the pterygopalatine fossa (100%) superior to ESITA (73.1%, p=0.043).
• Both approaches offer comparable exposure length for the AITF, but EEMP offers superior vertical exposure for the PPF.
• ESITA affords wider surgical freedom and more favorable angles of attack than EEMP.
• Clinical gross total or near total resection rates are higher with endoscopic approaches (88%) compared to transcranial (56%) and combined approaches (60%).
• Minor complications such as nasal crusting and transient facial numbness are more common with EEMP, while serious complications like meningitis and visual impairment occurred rarely with ESITA.

Clinical Implications

Surgeons should consider ESITA for lesions primarily involving the anterior infratemporal fossa to maximize resection and surgical maneuverability. For pterygopalatine fossa pathology, the endonasal endoscopic EEMP approach offers superior exposure and resection completeness with a favorable safety profile. Awareness of the distinct complication profiles can guide perioperative planning and patient counseling.

Conclusion

ESITA and EEMP approaches provide complementary advantages for accessing AITF and PPF lesions respectively. Tailoring the surgical approach based on lesion location optimizes resection outcomes and minimizes morbidity.

References

1. Battaglia P et al. 2014 -- Endoscopic endonasal transpterygoid transmaxillary approach to the infratemporal and upper parapharyngeal tumors
2. Eloy JA et al. 2012 -- Graduated endoscopic multiangle approach for access to the infratemporal fossa: a cadaveric study with clinical correlates
3. Fahmy CE et al. 2014 -- Volumetric analysis of endoscopic and traditional surgical approaches to the infratemporal fossa
4. Hofstetter CP et al. 2010 -- The endoscopic, endonasal, transmaxillary transpterygoid approach to the pterygopalatine fossa, infratemporal fossa, petrous apex, and the Meckel cave