Preoperative prediction of the location of parotid gland tumors using anatomical landmarks.
BACKGROUND
The location of the parotid gland tumor can affect the duration and difficulty of operation. Therefore, accurate preoperative evaluation of tumor location can affect surgical outcomes.


METHODS
Results in 100 patients with parotid gland tumors who underwent parotidectomy between January 2000 and October 2005 were retrospectively reviewed. Tumor location was determined relative to four landmarks--facial nerve (FN) line, Utrecht (U) line, Conn's arc (CA), and retromandibular vein (RV)--on computerized tomography (CT) scans, and confirmed by intraoperative findings. The accuracy of each landmark was evaluated. Correlations between accuracy and tumor size were determined for tumors < or =2 cm and >2 cm in diameter.


RESULTS
Of the four landmarks, the U line was the most accurate (94%), sensitive (89.3%), and specific (97.7%) in predicting tumor location. However, for tumors < or =2 cm in diameter, FN line (p = 0.022) and RV (p = 0.028) were significantly more accurate than U line and CA.


CONCLUSIONS
Although the U line was the most accurate in predicting the location of parotid gland tumors, landmarks predicting accurate tumor location should be selected according to tumor size.
Lim
Chi Young
CY
Department of Surgery, National Health Insurance Corporation Ilsan Hospital, Gyeonggi-do, Korea. sur@hanmail.net
Chang
Hang-Seok
HS
Nam
Kee-Hyun
KH
Chung
Woong Youn
WY
Park
Cheong Soo
CS
D000293:Adolescent; D000328:Adult; D000368:Aged; D005154:Facial Nerve / Q000000981:diagnostic imaging; D005260:Female; D006801:Humans; D008297:Male; D008334:Mandible / Q000098:blood supply; D008875:Middle Aged; D010306:Parotid Gland / Q000000981:diagnostic imaging* / Q000294:innervation* / Q000601:surgery; D010307:Parotid Neoplasms / Q000000981:diagnostic imaging* / Q000601:surgery; D011237:Predictive Value of Tests; D011300:Preoperative Care; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed; D014680:Veins; D055815:Young Adult