[Application of computer assisted navigation system in endoscopic sinus and skull base surgery].

Objective: To evaluate the applicative value of computer assisted navigation system in endoscopic sinus and skull base surgery.

Method: Forty-nine endoscopic surgery procedures were performed with the help of computer assisted navigation system, among which there were 25 cases of recurrent sinusitis and nasal polyps, 9 cases of nasal and sinus tumour, 7 cases of cerebrospinal fluid rhinorrhea, 2 cases of meningoencephalocele, 4 cases of congenital choanal atresia, 1 case of pituitary tumor and 1 case of foreign body in middle cranial fossa.

Result: The preoperative time was 5-13 minutes for preparation, 7 minutes in average.

[A comparison between anatomical landmark registration and surface registration for computer-assisted endoscopic sinus surgery].

Objective: To evaluate the clinical advantage and disadvantage of anatomical landmark registration (ALR) and surface registration (SR) in computer-assisted endoscopic sinus surgery (CAESS).

Method: Twenty-six patients were selected for the CAESS, the preparatory times and mean target registration errors (TRE) were recorded in order to compare the difference between them two, their convenience and their value were also analyzed.

Result: CAESSs were successfully used in 26 cases without complications.

[Functional evaluation and management of lower cranial nerve injuring after jugular foramen tumor surgery].

Objective: To evaluate the injuring and rehabilitation of lower cranial nerve after surgery of jugular foramen tumors.

Method: The lower cranial nerve functions were analyzed retrospectively in 32 cases with jugular foramen tumors in the past six years, including 12 jugular glomus, 10 schwannomas, three meningiomas, one cholesteatoma, two giant cell tumors, one fibromatosis, one chondromyxosarcoma, one adenoid cystic carcinoma and one embryonal rhabdomyosarcoma. All patients received surgical procedures.

[Endoscopic transnasal surgery for anterior skull base lesions].

Objective: To investigate the feasibility and subject range of endoscopic transnasal surgery for anterior skull base lesions.

Method: Six patients affected with anterior skull base diseases in recent years were studied. The lesions were included 3 cases of cen encephalocele, 2 of cerebrospinal rhinorrhea and one of left retrobulbar tumor.

[Surgery of jugular foramen region tumors].

Objective: To evaluate the various surgical approaches in removing the jugular foramen region tumors in order to obtain the maximal functional preservation.

Methods: Between March 1993 and May 2005, 32 patients with jugular foramen region tumors were operated. The mastoid and neck approach, the infratemporal fossa approach with and without rerouting the facial nerve, the combined transcochlear and infratemporal fossa approach were respectively used according to the tumor type, size, auditory, facial and lower cranial nerve functions.

[Intratympanic dexamethasone medication for sudden sensorineural hearing loss: clinical evaluation].

Objective: To investigate clinical efficacy of intratympanic dexamethasone injection for sudden sensorineural hearing loss.

Method: Subjects received an course of at least 7-day dexamethasone [5 g/(L x d)] intratympanic injection. Pure-tone averages (PTA) calculated using air conduction thresholds at 4 -frequencies (500, 1000, 2000, 4000 Hz) at pre-injection and post-injection were compared.

[Facial nerve monitoring in parotid gland surgery].

Objective: To investigate the use and effect of facial nerve monitoring in parotid gland surgery.

Method: Twenty-two patients with benign parotid tumor who received parotidectomy with continuous monitoring of the facial nerve were selected to analyse.

Result: Each patient had a total resection of tumor without facial nerve paresis or sialocele formation.

[Clinical analysis of 68 patients with obstructive sleep-disordered breathing in children].

Objective: To explore the clinical features and the diagnosis and the treatment of pediatric obstructive sleep-disordered breathing.

Method: Sixty- disordered breathing.

Method: Sixty eight cases with obstructive sleep-disordered breathing were reviewed including clinical features and cephalometric analysis and endoscopic examination, 46 of all them were study of polysomnography.

[Resection of child meningoencephaloceles by transnasal endoscopy].

Objective: To discuss the diagnosis of child meningoencephaloceles in nasal cavity and its methods of transnasal endoscopic surgery.

Method: Two cases of congenital meningoencephalocele which have manifested mass in nasal cavity or nasopharynx received total resection by transnasal endoscopic surgery. Their medical records, radiographic imagings, and surgical procedures were reviewed.

[Exposing the rabbit cerebellopontine angle through post-sigmoid sinus approach and recording the direct compound action potential of the auditory nerve].

Objective: To study the way of exposing the rabbit cerebellopontine angle through post-sigmoid sinus approach and recording the direct compound action potential of the auditory nerve, and to investigate the stability of DCAP N1 wave latency.

Method: Fifteen New Zealand rabbits which had normal Preyer's auricle reflex were selected. Each one was studied in the left ear.

[Enlarged translabyrinthine resection of recurrent acoustic neuroma after suboccipital resection].

Objective: To evaluate the technique and the outcome of enlarged translabyrinthine removal of recurrent acoustic neuromas after a suboccipital resection.

Method: Five patients were proved to have recurrent acoustic neuromas after previous suboccipital removal procedures. Revision surgery was accomplished in these patients using the enlarged translabyrinthine approach by sufficiently removing petrous temporal bone to enlarge exposed sight during the operation.

[Clinical diagnostic value for nasal bone fracture by three-dimensional reconstruction of spiral CT].

Objective: To evaluate the value of three-dimensional reconstruction of spiral CT in diagnosing nasal bone fracture.

Method: Forty-six patients with nasal bone fracture were scanned transverselly and reconstructed with three-dimensional software by GE Lightspeed Plus Multiple Slices Scaner.

Result: Nine cases (19.

[Partial remove of mastoid tip in open-ended tympanoplasty or mastoidetomy].

Objective: To summarize the effect of partial remove of mastoid tip in open-ended tympanoplasty or simple redical mastoidectomy.

Method: Ten cases of cholesteatoma otitis media were treated with simple redical mastoidectomy. Thirty-four cases were treated with open-ended tympanoplasty.

[Prevention and therapy of cerebrospinal fluid leakage after translabyrinthine acoustic neuroma removal].

Objective: To evaluate the modified wound closure technique and other methods for preventing and treating the cerebrospinal fluid (CSF) leakage after removal of acoustic neuroma by translabyrinthine approach.

Methods: In a series of 85 cases of acoustic neuroma surgery, two kinds of technique of wound closure, the traditional (as first group) and the modified (as second group), have been subsequently used to prevent CSF leakage. The incidences of CSF leak were analyzed respectively.

[Surgical management of Mondini dysplasia with cerebrospinal fluid leakage].

Objective: To evaluate the clinical manifestation and surgical technique of Mondini dysplasia with cerebrospinal fluid (CSF) leakage.

Method: Three Mondini dysplasia with spontaneous cerebrospinal fluid leakage were treated by the authors. A transcanal tympanotomy were used to pack the vestibular cavity with muscle.