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Objective@#To summarize the clinical characteristics and therapeutic experiences of the middle ear teratoma in infants.@*Methods@#Three cases of middle ear teratoma, from 2012-2015 in Beijing Friendship Hospital were analyzed.@*Results@#The three cases all developed slowly and presented unilateral otorrhea and hearing loss. Otoscopy showed the granulation tissue in the external ear canal. Audiological changes varied according to the degree of severity. Imaging features showed the pocket-like occupancy lesions in the Eustachian tube area. The temporal bone CT showed mass with soft tissue density usually involved in the mastoid and tympanic cavity. MRI showed mixed signal intense on both T1 and T2 weighted imaging. All the three cases received neoplasm resection of the middle ear. Only one case received tympanoplasty surgery at the same time. And all the pathology results displayed mature teratoma. The follow-up time was 17 to 54 months. MRI showed complete removal of the tumor.@*Conclusions@#Teratoma are rare in the head and neck neoplasm. When the infants suffer from the unilateral otorrhea, hearing loss, and granulation tissue formed in the external ear canal, it should be vigilant for teratoma. The differential diagnosis is middle ear cholesteatoma, congenital first branchial cyst or fistula, and middle ear carcinoma. Temporal bone CT combined with MRI could improve the accuracy of diagnosis. It should be totally resection as soon as possible if there is no contraindication. Postoperative follow-up and imaging examination are necessary to eliminate tumor recurrence.
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OBJECTIVE@#To report intraoperative round window cochlear microphonic potential test (CM) in patients with profound sensorineural deafness.@*METHOD@#Intraoperative round window CM test were performed on 40 cases with profound sensorineural deafness during cochlear implantation surgery under general anesthesia in the standard operating room. CM were compared with their reliable preoperation distortion product otoacoustic emission (DPOAE).@*RESULT@#The CM were found in 40 patients. The rate at 0.5, 1.0, 2.0, 4.0. kHz was respectively 90%, 97.5%, 100%, 92.5%. The preoperation DPOAE were found in some frequency in 9 cases. The rate at 0.5, 1.0, 2.0, 4.0 kHz was respectively was 2.5%, 2.5%, 17.5%, 2.5%.@*CONCLUSION@#The elicited rate of CM was obviously higher than the one of DPOAE in the same patient with profound sensorineural deafness. The intraoperative round window CM may objectively and accurately estimate the part of cochlear function in patients with profound sensorineural deafness.
Subject(s)
Adolescent , Adult , Child , Child, Preschool , Female , Humans , Infant , Male , Young Adult , Cochlear Implantation , Methods , Cochlear Microphonic Potentials , Hearing Loss, SensorineuralABSTRACT
Objective To explore the threshold and latency of patients receiving cochlear implantation using electrically evoked auditory brainstem responses (EABR), and to evaluate the significance of EABR applied to those patients.Methods The EABR and ECAP were recorded in 14 subjects who were operated for Nucleus24 cochlear implant.They were assigned to Group A and Group B according to the results of ECAP. The threshholds of EABR, the wave latency of III and V and inter-wave latency of III-V of EABR were compared and analyzed between Group A and Group B.Results The threshholds of EABR were higher in Group B than in Group A on electrode No 22 when the pulse width was 25,50,75,100,125 ?s,respectively. There were significant differences between Group A and Group B(P0.05).Conclusion The threshholds of EABR were lower in patients whose ECAP findings were positive. The latencies of III and V,and inter-wave latency of III–V of EABR had no significant difference according to the positive findings of ECAP.