Endoscopic transpterygoidal repair of a large cranial defect with cerebrospinal fluid leak in a patient with extensive osteoradionecrosis of the skull base: case report and technical note

An Unknown Foreign laryngeal Object: an exotic complication of skull base osteoradionecrosis

BACKGROUND

Osteoradionecrosis (ORN) of the skull base is a rare complication after head and neck radiation with a broad variety of subsequent complications.

METHODS

A 68-year-old woman with a complex oncological history (right-sided sphenoid meningioma; left-sided neck metastasis of a Cancer of Unknown Primary-CUP) was admitted with a right-sided epi-/ oropharyngeal mass and severe pain exacerbations for further evaluation. CT scan revealed an advanced ORN of the skull base with subsequent abruption of the ventral part of the clivus. This dislocated part of the clivus wedged in the oropharynx for 48 h and then moved towards the larynx, resulting in dyspnea and almost complete airway obstruction.

RESULTS

Due to the dangerous airway situation, an urgent exploration and removal of the dislocated clivus was necessary. After a potential cervical spine instability was ruled out, the patient's airway was initially secured with an awake tracheotomy and the clivus was removed transorally. The tracheostomy tube was removed during the ongoing inpatient stay, and the patient was discharged with significant pain relief.

CONCLUSIONS

The present case illustrates an orphan complication of skull base ORN resulting in a major airway emergency situation.

Treatment Outcomes for Osteoradionecrosis of the Central Skull Base: A Systematic Review

Objective Osteoradionecrosis (ORN) of the skull base can have catastrophic consequences if not detected early and managed appropriately. This is a systematic review of the different treatment modalities for skull base ORN and their outcomes.

Study Design This study is a systematic review.

Materials and Methods Two researchers extracted information including patient population, surgical technique, outcomes of interest, and study design. A computerized search of Medline, Embase, and the Cochrane library (January 1990–June 2020) looked for several papers on the subject of skull base ORN.

Results A total of 29 studies had met inclusion criteria, including data from 333 patients. Nasopharyngeal carcinoma was the most common primary tumor (85%). Average age at diagnosis of ORN was 55.9 years (range = 15–80 years) and 72.3% of patients were males. The average time to diagnosis of ORN after radiation therapy was 77 months with an average radiation dose of 76.2 Gy (range = 46–202 Gy). Nighty-eight patients (29.4%) also had chemotherapy as part of their treatment regimen. Although all parts of the central skull base were reported to be involved, the clivus and sphenoid bone were the most commonly reported subsites. Trial of medical treatment had a success rate of 41.1%. About 66% of patients needed surgical treatment, either primarily or after failing medical treatment. Success rate was 77.3%. Overall, the surgical treatment was superior to medical treatment (p < 0.0001).

Conclusion ORN is a rare complication of the treatment of skull base tumors. Most cases require surgical treatment, including endoscopic debridement or free flap reconstruction, which has a high success rate.

Level of Evidence Level 3 evidence as a systematic review of case studies, case reports, retrospective, and prospective trials with no blinding or controls.

Anterior Skull Base Reconstruction following Ablative Surgery for Osteoradionecrosis: Case Report and Review of Literature

Introduction:

Osteoradionecrosis is one of many potentially severe complications of radiotherapy for nasopharyngeal carcinoma. Osteoradionecrosis of the skull base is life-threatening due to the critical proximity of the pathological process to vital structures, for example, the intracranial cavity, the upper spine, and major blood vessels. Reconstructive options following surgical debridement of the anterior skull base and upper spine osteonecrosis have been scarcely described in the literature.

Case presentation and management:

We present a rare case of osteoradionecrosis of the clivus and cervical vertebrae C1-C2 in a patient previously treated with chemoradiotherapy for nasopharyngeal carcinoma, presenting as severe soft tissue infection of the neck. Aggressive surgical debridement and reconstruction with a two-paddle free anterolateral thigh flap was performed using a combination of transcervical and transnasal endoscopic approaches. A novel endoscopic procedure in the sphenoid sinus enabled flap anchoring in this complex area.

Discussion:

Surgical modalities for osteoradionecrosis of the skull base and upper spine are discussed and review of the literature is presented.

Conclusion:

Reconstruction of the anterior skull base with a well-vascularized free flap following ablative surgery should be considered in management of life-threatening osteoradionecrosis of the area. Endoscopic opening of the sphenoid sinus and creating a funnel-shaped stem is a newly described technique that guarantees precise placement of the flap and is a valuable adjunct to the reconstructive armamentarium.