The authors will present a case report of a woman that presented a giant sphenoidal tumor with endocranially extension and compression of the cerebral trunk. The patient was already presented in a neurosurgical service where due to the tumor volume, the high-risk surgical elements involved was sent to our ENT department to try to perform an endoscopic biopsy. Using the endoscopic optical and mechanical ensemble the authors performed trans nasally a biopsy. The histopathologic result was a surprise and was confirmed with three different immune- histochemistry exams.