RESUMO
OBJECTIVE: Despite the surgical cotton patties application and meticulous manipulation, mechanical contact between the different microsurgical instruments and neurovascular structures may jeopardize its integrity through laceration or cerebrospinal perfusion. We present a technique based on using collagen films and cigarettes, both to protect and retract such structures, and compared it with the cottonoid technique. MATERIALS AND METHODS: During the last 3 years, collagen in "film and cigarette format" has been used in several microsurgical procedures for the treatment of craniospinal lesions by the first author. The collagen films were broken into pieces and adapted to the exposed neural surface measurements to protect and/or retract during microsurgical dissection. At the same time, handmade collagen "cigarettes" were used as retractors to keep open the neural lips of the transsulcal and transfissural corridors. To investigate the relevance of this technique for minimizing surgical morbidity, a blind third-party observer quantified the tissue preservation by a postoperative magnetic resonance imaging (MRI) protocol, in a short series with randomized cotton patty vs. collagen film protection. RESULTS: Only two of the 20 examined "collagen group" cases exhibited areas of additional abnormal signal, as against 16 cases of the "cotton patty group." Furthermore, a statistically significant difference between both the groups based on the radiological results was also demonstrated. CONCLUSION: The results of the present series support the usefulness of the neurovascular coverage and retraction with collagen films and cigarettes, respectively. It seems to be a good alternative to surgical cotton patties and other materials owing to its hemostatic, protection, retraction, and dissection capacity.