A novel endoscopic classification for craniopharyngioma based on its origin

Area of Science:

• Neurosurgery
• Endocrinology
• Oncology

Background:

• Craniopharyngiomas (CPs) are complex tumors affecting the pituitary stalk and hypothalamus.
• The endoscopic endonasal approach offers improved visualization for CP resection.
• Understanding tumor origin is crucial for surgical strategy and patient outcomes.

Purpose of the Study:

• To classify craniopharyngiomas based on their relationship with the pituitary stalk using an endoscopic endonasal approach.
• To analyze the growth patterns and surgical outcomes associated with different CP subtypes.
• To determine the impact of tumor origin on hypothalamus preservation and surgical strategy.

Main Methods:

• Retrospective analysis of 92 craniopharyngioma resections via endoscopic endonasal approach.
• Classification of CPs into Peripheral (further divided into Hypothalamic, Suprasellar, Intrasellar stalk subtypes) and Central types.
• Evaluation of tumor origin, growth pattern, and relationship to the pituitary stalk and hypothalamus.
• Assessment of pituitary stalk preservation rates and hypothalamic damage post-surgery.

Main Results:

• CPs were classified into Peripheral (71.7%) and Central (28.3%) types.
• Peripheral CPs showed higher pituitary stalk preservation rates (76.0%) compared to Central types (15.4%).
• Hypothalamic stalk CPs (54.6% of Peripheral) resulted in hypothalamus damage in all cases, while Suprasellar and Intrasellar subtypes had less damage.

Conclusions:

• The endoscopic endonasal approach allows for detailed classification of craniopharyngiomas based on their origin relative to the pituitary stalk.
• Distinguishing between Peripheral and Central CP types, and their subtypes, is critical for predicting surgical outcomes and minimizing hypothalamic injury.
• This classification aids in tailoring surgical approaches to optimize tumor resection and preserve vital neuroendocrine function.