title: [Review of 300 cases of parotidectomy for benign parotid tumors].
abstract: OBJECTIVE
  The objective of this study was to analyze the diagnosis and postoperative complications of benign parotid tumors for a series of 300 patients who underwent the same diagnostic methods and operation procedure in a single institute.
  
  
  METHODS
  A series of 300 patients who underwent primary parotidectomy for benign parotid tumors over a 12-year period was reviewed.
  
  
  RESULTS
  There were 145 female and 155 male paitents. The site of the tumors was divided into three groups, superficial, deep, and lower pole tumor. The number of each type of the tumor was 152, 45, 103 cases, respectively. The most common pathology of the parotid tumor was a pleomorphic adenoma (147 cases) followed by a Warthin tumor (111 cases). Pleomorphic adenomas and Warthin tumors accounted for 86% of all benign tumors. The accuracy rate of fine needle aspiration cytology (FNAC) for all benign tumors was 66%, 80% for pleomorphic adenoma and 67% for Warthin tumor. Transient facial nerve dysfunction was observed in 63 patients (20.3%) in all benign parotid tumors, and no patients developed a permanent weakness. The incidence of transient facial nerve dysfunction was 16.4% in superficial tumors, 55.3% in deep tumors, and 10.7% in lower pole tumors. Significant risk factors for development of a transient facial palsy were the site of tumors, operation time, and bleeding volume. Transient facial nerve dysfunction recovered with 1.7 months and 2.8 months in superficial and deep tumors, respectively.
  
  
  CONCLUSIONS
  The accuracy rate of FNAC for benign parotid benign tumors was 66%. The incidence of transient facial nerve dysfunction in deep tumors was significantly higher compared to that in superficial and lower pole tumors. According to the rate of facial palsy, operation time, and bleeding volume, benign parotid tumor should be divided into three groups, superficial, deep, and lower pole tumors.
authors: Department of Otolaryngology, Osaka Medical College, Takatsuki.
authors: Ryo
authors: R
authors: Kawata
authors: Kotetsu
authors: K
authors: Lee
authors: Katsuhiro
authors: K
authors: Yoshimura
authors: Shuji
authors: S
authors: Nishimawa
authors: Michitoshi
authors: M
authors: Araki
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D044963:Biopsy, Fine-Needle; D013507:Endocrine Surgical Procedures / Q000009:adverse effects; D005154:Facial Nerve / Q000503:physiopathology; D005158:Facial Paralysis / Q000209:etiology / Q000503:physiopathology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010306:Parotid Gland / Q000473:pathology / Q000601:surgery*; D010307:Parotid Neoplasms / Q000473:pathology / Q000601:surgery*; D011183:Postoperative Complications / Q000453:epidemiology; D016896:Treatment Outcome; D055815:Young Adult