CPT® Code 61312

A supratentorial craniectomy or craniotomy is a surgical procedure performed to evacuate a hematoma located in the supratentorial region of the brain, which is situated above the tentorium cerebelli. The tentorium cerebelli is a fold of dura mater that separates the cerebrum, specifically the frontal and occipital lobes, from the cerebellum. This procedure is indicated for two types of hematomas: extradural and subdural. An extradural hematoma occurs when there is a collection of blood between the inner table of the skull and the dural membrane, often resulting from trauma. In contrast, a subdural hematoma is characterized by blood accumulation between the dural and arachnoid membranes, typically due to the tearing of veins during head injury. The surgical approach involves either a craniectomy, where a portion of the skull is removed, or a craniotomy, where the skull is opened but may be replaced after the procedure. The choice between these techniques depends on the specific circumstances of the hematoma and the surgeon's assessment. The goal of the procedure is to relieve pressure on the brain caused by the hematoma, thereby preventing further neurological damage. Proper execution of this procedure is critical to ensure the safety and recovery of the patient, as it involves careful manipulation of brain structures and the surrounding tissues.