Peer-Review ReportNonglomic Tumors of the Jugular Foramen: Differential Diagnosis and Prognostic Implications

ObjectiveTumors of the jugular foramen are notably rare, and the majority of them arise from the glomic tissue of the jugular vein. There are other tumors that do not originate from that tissue, and these are called the nonglomic tumors. This report includes a series of patients with nonglomic tumors of the jugular foramen to analyze their biological and radiological behavior and the clinical outcomes of patients.MethodsPatients with tumors of the jugular foramen other than chemodectomas were included for the present series. All of the patients were subjected to a protocol that included imaging studies and a complete clinical evaluation. Surgery was planned and performed by a multidisciplinary team using the following approaches: retrosigmoid, infratemporal fossa, and zygomatic-transmandibular. Depending on the precise diagnosis and surgical outcomes, radiotherapy or radiosurgery were indicated. The average follow-up period was 5 years.ResultsThirty patients with nonglomic tumors were included: 18 schwannomas, 6 meningiomas, 5 chordomas, and 1 metastatic carcinoma. The patients with chordomas had the most severe clinical manifestations, and the chordomas were the largest and most invasive tumors that destroyed the jugular foramen contour on imaging studies. Schwannomas presented a more benign clinical evolution and enlarged (but did not destroy) the jugular foramen contour. Two patients died (chordomas) during the follow-up because of tumor activity.ConclusionsThe most common nonglomic tumor of the jugular foramen was the schwannoma, which was the lesion with the best surgical prognosis. Chordoma is a rare and highly destructive tumor that has a notably high recurrence index.