CPT® Code 61522

The procedure described by CPT® Code 61522 refers to a craniectomy performed specifically in the infratentorial or posterior fossa region of the brain for the purpose of excising a brain abscess. The infratentorial area is located beneath the tentorium cerebelli and encompasses critical structures such as the cerebellum and brainstem. A craniectomy involves the surgical removal of a portion of the skull to access the brain. This is achieved by first creating scalp flaps, followed by the drilling of burr holes in the skull. The bone between these burr holes is then meticulously cut using a surgical saw or craniotome, allowing for the elevation and removal of a bone flap, which may be done temporarily or permanently. In the context of this procedure, the focus is on the excision of a brain abscess, which is a localized collection of pus within the brain tissue. The surgical approach requires careful dissection of the abscess wall from the surrounding brain tissue to ensure that the entire abscess pocket is removed without causing rupture of the abscess wall, which could lead to further complications. This procedure is distinct from other related procedures, such as craniotomy, where the bone flap is elevated to expose the brain for various interventions, including the excision or fenestration of cysts. After the abscess is excised, the dura mater, which is the outermost layer of the protective covering of the brain, is repaired. The bone flap is then repositioned over the dura and secured using steel sutures, or alternatively, the skull defect may be filled with materials such as bone wax or silicone. Finally, the scalp flap is reapproximated, and the skin incision is closed, completing the surgical intervention.