CPT® Code 61530

Craniectomy, bone flap craniotomy, transtemporal (mastoid) for excision of cerebellopontine angle tumor; combined with middle/posterior fossa craniotomy/craniectomy

The procedure described by CPT® Code 61530 refers to a craniectomy that involves a bone flap craniotomy using a transtemporal (mastoid) approach specifically for the excision of a cerebellopontine angle tumor. The cerebellopontine angle is a critical anatomical region located at the junction of the cerebellum and the brainstem, filled with cerebrospinal fluid, and bordered medially by the brainstem, laterally by the temporal bone, and superiorly by the cerebellum. This area is significant as it is the most common site for intracranial posterior fossa tumors, with acoustic neuromas being the most prevalent type. Acoustic neuromas, also known as vestibular schwannomas, are slow-growing tumors that arise from the acoustic nerve, which is situated behind the ear and beneath the cerebellum. Other tumors that may occur in this region include various benign tumors and both primary and metastatic malignant tumors. The procedure combines the transtemporal approach with a middle and posterior fossa craniectomy to enhance the surgical exposure necessary for effective tumor removal. This approach allows for the identification and preservation of critical neural structures while facilitating the complete excision of the tumor, thereby addressing the underlying pathology effectively.