Contributing factors for delayed postoperative cerebrospinal fluid leaks and suggested treatment algorithm

Area of Science:

• Neurosurgery
• Skull Base Surgery
• Cerebrospinal Fluid Dynamics

Background:

• Delayed cerebrospinal fluid (CSF) leaks are infrequent and understudied complications following endonasal skull base surgery.
• Understanding the etiology and effective reconstruction strategies for these leaks is crucial for patient management.

Purpose of the Study:

• To identify the primary causes of delayed postoperative CSF leaks.
• To evaluate the efficacy of different surgical reconstruction techniques for these leaks.

Main Methods:

• Retrospective analysis of 1017 endonasal skull base surgeries.
• Identification and detailed review of 17 cases with early or delayed CSF leaks.

Main Results:

• Common causes of delayed CSF leaks include flap dehiscence, provoking events, flap necrosis, displacement, and inadequate apposition.
• Symptoms frequently present as rhinorrhea, headache, and meningitis.
• Reconstruction involved free fat grafts, collagen matrix with fat grafts, or flap repositioning/replacement.

Conclusions:

• The study elucidates common etiologic factors and initial symptoms of delayed CSF leaks.
• A reconstructive algorithm prioritizing reinforcement with free abdominal fat grafts, potentially with collagen matrix, is proposed.