OBJECTIVE: The comparison of nerve conduction parameters of each laboratory is difficult because those are influenced by many factors. This study was performed to provide comprehensive normative nerve conduction parameters of median nerve by using a meta-analysis. METHOD: We searched MEDLINE between year 1965 to 2000. Among them we selected 7 articles that provided the mean, standard deviation and sample size of median nerve conduction study and estimated the reference value of median nerve conduction parameters using a meta-analysis. RESULTS: The distal latency of median motor nerve was measured at 8 cm proximal to motor point of abductor pollicis brevis and the distal latency of median sensory nerve was measured at 14 cm proximal to interphalangeal joint of 2nd or 3rd finger. Mean of distal onset latency, amplitude, and conduction velocities of median motor nerve were 3.46 msec, 11.12 mV, and 57.10 m/sec, respectively. Mean of onset distal latency, peak distal latency, and amplitude of median sensory nerve conduction study were 2.72 msec, 3.34 msec, and 37.29 mV, respectively. CONCLUSION: Meta-analysis can summarize large quantity of studies and can maximize subject numbers, it can provide reference value approximate to the normal one. So this value can be used in interpretation of the reference value of each laboratories.
Fingers ; Joints ; Median Nerve* ; Neural Conduction ; Reference Values* ; Sample Size

Adenoid cystic carcinoma (ACC) is a rare variant of adenocarcinoma that usually occurs in the major salivary gland. In breast, adenoid cystic carcinoma is a very rare carcinoma accounting for less than 1% of the all breast carcinoma. It has an excellent prognosis with the lower incidence of distant metastasis and axillary lymph node involvement, and a benign looking or low suspicious findings on imaging. We will report the radiologic and pathologic finding of the adenoid cystic carcinoma that is incidentally detected in the right breast of asymptomatic 47-year-old woman, who had taken annual screening mammogram and ultrasonogram.
Adenocarcinoma ; Adenoids* ; Breast Neoplasms ; Breast* ; Carcinoma, Adenoid Cystic* ; Female ; Humans ; Incidence ; Lymph Nodes ; Mass Screening ; Middle Aged ; Neoplasm Metastasis ; Prognosis ; Salivary Glands ; Ultrasonography