Craniotomy - Procedure, Indications and Contraindications

Introduction:

A craniotomy is a surgery in which a portion of the skull is removed transiently to uncover the brain and execute an intracranial procedure. The typical conditions that can be handled through this method include tumors, brain aneurysms, arterio-venous disorders, subdural empyemas, subdural hematomas, and intracerebral hematomas. Technical instruments and tools are utilized to extract the bone segments called bone flaps. This bone flap is extracted transiently, kept at the instrument table, and then repositioned post-surgically.

What Is Craniotomy?

A craniotomy is a procedure done to remove a part of the skull. Based on the cause and indication, the bone can be scrapped and kept in the abdominal subcutaneous area. The approach is called a craniectomy if the flap is scrapped or not repositioned into the skull in operation. Decompressive craniectomy is used in treating cancerous brain edema, and the flap is repositioned after the swelling is reduced. In the second procedure, the surgical method to rebuild and reposition the flap into the skull is called cranioplasty. Based on the kind of lesion occurring intracranially, its pathology, and the approach used, craniotomy processes can be done by neuronavigation guidance depending on magnetic resonance imaging. It also uses computed tomography scans for the process using the least incision. Neuronavigation is a computerized technology that supports surgeons in localized diseases. It gives a higher grade of confidence and an improved postoperative result.

What Is the Difference Between Craniotomy and Craniectomy?

Craniotomy and craniectomy are both types of brain surgery; however, they are different procedures. In the case of craniotomy, a part of the skull is removed and replaced to access the brain. Even in the case of craniectomy, a part of the skull is removed; however, it is not replaced immediately after the surgery. A follow-up surgery called a cranioplasty will be performed to replace the skull.

What Are the Types of Craniotomy?

There are many types of craniotomy procedures; some are:

• Frontal: Front of the skull at the hairline.

• Temporal: Session of the skull, which includes part next to the eyes and front of the ear.

• Parietal: This part includes the top-middle and upper back of the skull.

• Pterional: Side of the skull.

• Orbitozygomatic: Skull present near the eye socket and cheek.

• Retrosigmoid: Incision of the skull behind the ears.

• Suboccipital: Base of the skull.

What Are the Anatomic and Physiologic Considerations in Craniotomy?

• There are various craniotomy procedures. The type of craniotomy is based on the open top portion of the skull. Characteristic skull bones are selected for craniotomy, involving the frontal, parietal, temporal, and occipital bones. Based on the pathology, supratentorial or infratentorial craniotomies can be used.

• One of the conventional craniotomies employed is peritoneal craniotomy. It is a supratentorial craniotomy employed for front region blood circulation aneurysms, basilar tip artery, straightforward surgical procedures to the cavernous sinus, frontal lobe tumors, temporal lobe tumors, suprasellar tumors like pituitary adenomas and craniopharyngiomas. Another kind of supratentorial craniotomy is the temporal craniotomy or subtemporal craniotomy, which can be used for biopsy procedures, especially for the temporal lobe, lobectomy, epilepsy procedure, and lobe. It also provides an entrance to the middle cranial fossa.

• The craniotomy of the front portion is utilized to reach the frontal skull floor and the frontal lobe for procedures to the third ventricle tumors or sellar area tumors, craniopharyngiomas, planum sphenoidal meningiomas, tumors, and restoration of anterior cerebrospinal fluid fistulas.

What Are the Indications of Craniotomy?

The craniotomy procedure is indicated in numerous conditions requiring the opening of the skull. It is done to find the disease and also for its treatment.

Common conditions in which craniotomy is indicated are-

• Brain aneurysm.

• Vascular malformations include arterio-venous disorganization, cavernous angioma, and fistula in the vessels.

• Brain tumors include the meningioma, elevated-grade and inferior-grade glioma, epidermoid, ependymoma, oligodendroglioma.

• Orbital tumors or tumors in the eyes.

• Pituitary adenomas.

• Tumors in the cerebellopontine angle.

• Pain management is like microvascular decompression.

• Abscess.

• Empyema.

• Intracerebral hematomas, epidural hematoma, subdural hematoma.

• Decompressive.

• Lobectomy.

• Epilepsy procedure.

• Craniosynostosis.

• Depressed ruptures.

• Intracranial foreign bodies.

• Cerebrospinal fluid leak restoration.

What Are the Contraindications of Craniotomy?

There are some contraindications to achieving this procedure, and those depend on the patient's disease condition.

Some contraindications are -

• Older age.

• Inadequate functional grade.

• Extreme cardiopulmonary condition.

• Severe systemic collapses like sepsis and multiple organ failure.

• Diseases that a single bur hole can manage.

• Changed preoperative coagulation parameters.

• Bleeding disorders.

How Is Pre-operative Preparation Done in Craniotomy?

• The patient must be in good condition to accept the process. The patient should fast and have an empty stomach. Anticoagulants (blood-thinning medications) should be stopped three to 10 days before the procedure.

• Craniotomy processes are executed under general anesthesia, requiring anesthesiological discussion to determine practical and etiological reasons for management. In a few cases, craniotomy is accomplished under local anesthesia, so communication between patient and surgeon is possible during the procedure involving motor and vocabulary rooms.

• Periodic antibiotics are given preoperatively before the process, which is given for infection prevention along with other drugs, such as anticonvulsants and corticosteroids. Original equipment like a neuronavigation system, microscope, and nerve monitoring is achieved. Preoperatively confirm the availability of intensive care units.

What Are the Complications of Craniotomy?

Like other surgical procedures, a craniotomy can also cause certain complications. Preoperatively, patients should be aware of these complications, which can be managed by taking certain precautions to achieve better outcomes.

They are,

• Loss of blood that occurs intraoperatively.

• Sinus perforation.

• Intracerebral, epidural, or subdural hematomas.

• Laceration occurs with the craniotome.

• Seizure.

• Stroke.

• Coma and death.

• Hydrocephalus.

• Neurologic deficit.

• Infection.

• Osteomyelitis of the bone flap.

• Meningitis can be bacterial or fungal.

• Headache occurring postoperatively.

• Drill perforator plunge.

• Embolism.

What Is the Clinical Significance of Craniotomy?

The process of craniotomy is an essential method in advanced healthcare for neurological diseases. Before the beginning of the approach, some patients would not survive circumstances managed daily. Conditions varying from tumors, pathologies of the vascular system, and concussion are treated regularly, which may cause a devastating patient injury if entry to the intracranial cavity is restricted. The procedure has been updated and resumed with the beginning of the latest technology. It produces a process for neurosurgical and neurological management.

What Are the Risk Factors Related to Craniotomy?

Some risk factors are:

• Bleeding.

• Pain.

• Seizure.

• Infection.

• Headache.

• Come.

• Stroke.

When Should the Person See the Health Care Provider?

The person needs to consult the doctor if:

• The operated site is not healing.

• The person has a fever.

• The operated site is very painful and has swelling.

They should immediately consult the doctor if:

• The person experiences any signs of stroke.

• Breathing issues.

• Experience seizure.

Conclusion:

Distinct improvement techniques are developed to enhance patient management, and doctors' team results are split into preoperative, intraoperative, and postoperative. Postoperative patient management includes an interprofessional team that includes an intensive care unit and nurses. A few cases require speech pathologists, physicians, physical therapists, respiratory doctors, and a discharge scheduling team.