Does interscalene block increase intracranial pressure?

Interscalene brachial plexus (ISB) block is widely used in shoulder and humerus surgeries, especially in patients that have high risk for general anesthesia. Increased intracranial pressure (ICP) is not among the complications of this block because there is no data about this issue in the literature. In this traumatic case report, a patient with headache and with a known meningioma in his right temporo occipital region is gonna have a proximal humerus fracture surgery with ISB block under repetitive optic nerve sheath diameter measurements. The result of this case report can add a unique information to the ISB literature.