Posterior Displacement of the Motor Blood Oxygen Level‐Dependent Functional MRI Signal into the Postcentral Gyrus in Patients with Preoperative Brain Tumor and Healthy Volunteers: Practical Guidelines to Correctly Interpret Functional MRI Findings

Blood oxygen level‐dependent functional MRI is a useful method for mapping functional cortices in preoperative patients with brain tumor. However, motor functional MRI activation is occasionally displaced from the precentral gyrus into the postcentral gyrus; this displacement could lead to errors in the interpretation of eloquent cortices in patients with brain tumor. Being aware of this phenomenon and using the guidelines, one will be able to correctly identify the precentral (motor) gyrus by using functional MRI even in cases of displacement.