[A comparison between CT and SPECT in detecting mandibular invasion by lower gingival squamous cell carcinoma].
OBJECTIVE
The purpose of this study is to compare the value of CT and SPECT in diagnosis of lower gingival carcinoma invading the mandible.


METHODS
From February 2002 to October 2006, twenty-one patients with lower gingival squamous cell carcinoma were enrolled.The data of CT and SPECT were studied,and compared with histopathological findings.


RESULTS
Among the 21 patients,the sensitivity, accuracy, negative predictive value and Youden's index of SPECT were 100.00%, 95.24%, 100.00% and 1.00,respectively. While the sensitivity, accuracy, negative predictive value and Youden's index of CT were 80.00%, 80.95%, 20.00% and 0.80, respectively. There were four false negatives assessments of bone invasion(80.00%) by CT scan, while no false negatives by SPECT.


CONCLUSIONS
SPECT is superior to CT, and can be used as a routine screening method to assess lower gingival carcinoma invading the mandible.
Duan
Qing-Yun
QY
Department of Oral and Maxillofacial Surgery, Hangzhou First People's Hospital, Hangzhou 310006, Zhejiang Province, China. dqybd@163.com
Jia
Mu-Yun
MY
Zhang
Xiong
X
Yuan
Rong-Tao
RT
Bu
Ling-Xue
LX
Shang
Wei
W
Zhao
Jie
J
Zuo
Shu-Yao
SY
Jin
Xiao-Ming
XM
Li
Ning-Yi
NY
D002294:Carcinoma, Squamous Cell / Q000473:pathology*; D005887:Gingival Neoplasms / Q000473:pathology*; D006801:Humans; D008334:Mandible; D009361:Neoplasm Invasiveness; D012680:Sensitivity and Specificity; D015899:Tomography, Emission-Computed, Single-Photon; D014057:Tomography, X-Ray Computed