CPT® Code 61526

The procedure described by CPT® Code 61526 refers to a craniectomy involving a bone flap craniotomy performed via a transtemporal (mastoid) approach specifically for the excision of tumors located at the cerebellopontine angle. The cerebellopontine angle is a critical anatomical region situated between the cerebellum and the brainstem, bordered laterally by the temporal bone. This area is filled with cerebrospinal fluid and contains important structures, including lower cranial nerves (IX, X, XI) and the internal auditory canal. Tumors in this region, particularly acoustic neuromas, are the most prevalent type of intracranial posterior fossa tumors. Acoustic neuromas, also known as vestibular schwannomas, are benign, slow-growing tumors that arise from the acoustic nerve, which is positioned behind the ear and beneath the cerebellum. Other less common tumors may also occur in this area, including various benign tumors and both primary and metastatic malignant tumors. The transtemporal approach utilized in this procedure allows for effective access to the tumor by creating a postauricular skin flap, exposing the temporalis muscle and mastoid periosteum, and performing a mastoidectomy to facilitate the removal of the tumor while preserving surrounding critical structures.