CPT® Code 61585

Orbitocranial approach to anterior cranial fossa, extradural, including supraorbital ridge osteotomy and elevation of frontal and/or temporal lobe(s); with orbital exenteration

The CPT® Code 61585 describes a complex surgical procedure known as the orbitocranial approach to the anterior cranial fossa, which is performed extradurally. This approach is primarily utilized for addressing various conditions affecting the anterior cranial fossa, including the resection of malignant tumors, management of infectious diseases, and treatment of traumatic injuries to the orbit and paranasal sinuses. A key component of this procedure is orbital exenteration, which involves the removal of the periorbita, eyeball, associated appendages, eyelids, and the surrounding skin. The surgical technique begins with an incision in the scalp, strategically placed along the inferior border of the zygomatic arch and extending upward and forward to intersect at the contralateral midpupillary line, ensuring minimal visibility post-operation. The procedure requires careful elevation of the frontal periosteum while preserving its attachment to the bone, allowing for optimal access to the underlying structures. The dissection continues with the mobilization of the temporalis muscle and the creation of a fascial cuff, which aids in the reapproximation of the muscle layer after the procedure. The meticulous dissection of the periorbita and the exposure of the supraorbital ridge are critical for achieving the necessary access to the orbit. The procedure may also involve the elevation of the frontal and/or temporal lobes, which can be performed without orbital exenteration, as indicated by the related CPT® Code 61584. The classification of orbital exenteration is further detailed, with four types based on the extent of tissue removal, ranging from sparing the palpebral skin and conjunctiva to complete removal of the eyeball, eyelids, and involved bone structures. This comprehensive description underscores the complexity and precision required in performing the orbitocranial approach to the anterior cranial fossa with orbital exenteration.