LAUSR

OBJECTIVE Secondary trigeminal neuralgia (TN) caused by cerebellopontine angle (CPA) tumors are rare. However, TN may be a primary manifestation in the neurosurgery department. In this study, we aimed to retrospectively assess patients with CPA tumor-induced TN from a single center. METHODS Of 819 consecutive patients with TN treated at our center between 2007 and 2017, 36 with CPA tumor-induced TN were enrolled, and their medical and surgical records were analyzed. RESULTS The 36 patients accounted for 4.4% of all patients with TN. A comparison of patients with classical and tumor-induced TN indicated significant intergroup differences in the mean age at surgery (58.94 vs 49.33 years, P = 0.000), the mean age at onset of TN (52.01 vs. 38.04 years), and affected side (298/485 vs 22/14 in left/right, P = 0.006); no such difference was noted in the sex ratio (0.598 vs. 0.385, P = 0.214). The rates of excellent, good, and fair clinical outcomes were 80.56%, 13.89%, and 2.78% respectively. The offending vessels found during surgery included the superior and anterior inferior cerebellar arteries in three and four cases, respectively. Postoperative complications included aseptic meningitis, facial numbness, hearing disturbance, facial palsy, hemorrhage, and diplopia in one, two, three, four, one, and two cases, respectively. CONCLUSIONS Secondary TN caused by CPA tumors is not as frequent as classical TN. Compared to classical TN, tumor-induced TN is characterized by symptom onset and surgery at a younger age. Direct compression rather than chemical irritation is the cause of secondary TN.