CPT® Code 61521

The procedure described by CPT® Code 61521 involves a craniectomy specifically for the excision of a brain tumor located in the infratentorial region or posterior fossa, particularly a midline tumor at the base of the skull. The infratentorial area is situated beneath the tentorium cerebelli, which is a significant fold of the dura mater that serves to protect and support the cerebellum and the brainstem. This surgical intervention is critical for addressing tumors that may affect vital neurological functions due to their proximity to essential brain structures. The craniectomy entails the removal of a section of the skull to access the brain, allowing for the careful dissection and removal of the tumor while minimizing damage to surrounding tissues. The procedure is performed with precision, often utilizing an operative microscope to enhance visualization of the surgical field, ensuring that blood vessels and other critical structures are preserved during the tumor resection. The ultimate goal of this procedure is to achieve complete tumor removal when feasible, or to excise as much of the tumor as possible while safeguarding the patient's neurological integrity.