The most common tumor in the pontocerebellar horn region is auditory neuroma, followed by meningioma, trigeminal nerve sheath tumor, and epidermoid cyst. The diagnosis mainly relies on MRI examination, which is clearer than CT examination and has nearly 100% diagnostic reliability. The principle of treatment is to perform complete surgical resection in order to obtain a radical cure. The aim is to remove the tumor completely and preserve the neurological function to the maximum extent. The following 10 tips should be paid special attention in the operation of posterior approach of pontocerebellar horn tumor via sigmoid sinus: 1. Make good preoperative preparation, read MRI film carefully, fully understand the texture, shape, boundary of tumor and anatomical relationship with surrounding nerves, blood vessels and brainstem, and do MRA, CTA or DSA if the tumor is large. 2. When designing the position, scalp incision, bone window size and dural incision, comprehensive consideration should be made to fully expose the surgical field and consider the size of trauma and safety; 3. Pay attention to the order of tumor exploration and resection, and clarify the relationship between the tumor and its neighbors; 8.