The retrosigmoid approach is a well-established surgical corridor to the posterior cranial fossa, and it is primarily used for accessing lesions in the cerebellopontine angle (CPA), such as acoustic neuromas, meningiomas, and vascular compression syndromes [1–3]. This approach involves a curvilinear incision behind the ear, followed by craniotomy that provides direct access to the CPA while minimizing cerebellar retraction [4]. The key anatomical landmarks include the transverse and sigmoid sinuses, which dictate the craniotomy boundaries to prevent iatrogenic vascular injury [5]. Studies have refined the optimal burr hole placement to reduce complications, such as excessive sinus bleeding, and to ensure a safe surgical corridor [5]. Advancements in microsurgical techniques and neuronavigation have further enhanced the efficacy and safety of this approach, making it a preferred option for posterior fossa tumor resection and neurovascular decompression [3].