MRI of gastric carcinoma: results of T and N-staging in an in vitro study.
OBJECTIVE
To determine the accuracy of 1.5-T magnetic resonance imaging (MRI) in the evaluation of gastric wall invasion and perigastric lymph node metastasis in gastric adenocarcinoma.


METHODS
Twenty resected gastric specimens containing 20 tumors were studied with a 1.5-T MR system using a commercial head surface coil. MR scanning was performed with a T1 weighted image (TR/TE = 500/20), and a T2 weighted image (TR/TE = 2500/90). MR findings were compared with pathologic findings.


RESULTS
A T1-weighted image demonstrated three layers in the normal gastric wall. All of the gastric tumors were well demonstrated by lesions and location. In a MRI findings of gastric wall invasion, there was 1 case of T1, 7 of T2, 11 of T3. Pathologic results of resected specimens included 3 cases of pT1, 4 of pT2, and 12 of pT3. The accuracy of T staging with MRI was 74% (14 of 19). MRI findings of lymph node metastasis included 6 cases of N0, 13 cases of N1. The accuracy of the N staging with MRI was 47% (9 of 19).


CONCLUSIONS
MRI has a high diagnostic accuracy in the evaluation of the T staging of gastric cancer in vitro and thus potentially enables preoperative histopathologic staging.
Kim
Il Young
IY
Department of Radiology, Soonchunhyang University Cheonan Hospital, Cheonan, Choongnam 330-720, South Korea. ilykim@schca.ac.kr
Kim
Sang Won
SW
Shin
Hyeong Cheol
HC
Lee
Moon Soo
MS
Jeong
Dong Jun
DJ
Kim
Chang Jin
CJ
Kim
Young Tong
YT
D000230:Adenocarcinoma; D000328:Adult; D000368:Aged; D002277:Carcinoma / Q000175:diagnosis* / Q000473:pathology*; D005260:Female; D006801:Humans; D066298:In Vitro Techniques; D008207:Lymphatic Metastasis; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008495:Medical Oncology / Q000379:methods; D008875:Middle Aged; D009361:Neoplasm Invasiveness; D009367:Neoplasm Staging; D015203:Reproducibility of Results; D013274:Stomach Neoplasms / Q000175:diagnosis* / Q000473:pathology*
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