We have carried out OUS to detect liver metastasis on 50 Patients (groupA) and depth of invasion on
44 patients. In another 50 patients (groupB) we tried to detect liver metastasis by palpation without OUS.
Both the 30 cases with no liver metastasis as judged by OUS (groupA) and the 23 cases with no liver
metastasis as judged by palpation (groupB) were followed up every 3 months for 2 years after operation
by computed tomography and ultrasonography to detect liver metastasis. In groupA, liver metastasis was
noted in only 4 cases from 15 months to 2 years (Mean±SD: 20±3.74 months) after operation, while in
groupB, liver metastasis was noted in 7 cases within 1 year (Mean±SD: 7.42±3.25 months) after
operation (2 cases within only 4 months after operation). Those suggest that GroupB surely included case
of occult liver metastasis. In fact we diagnosed 3 cases of small liver metastasis using only OUS. In trying
to detect depth of invasion by OUS, we achieved high diagnostic accuracy, 81.8% (36/44). Besides,
submucosal spreading from a main lesion that could not be palpated was clearly demonstrated by OUS.
OUS was very useful not only for detecting liver metastasis, but also for detecting the depth of cancer
invasion and submucosal spreading. During operations on gastric cancer, this information enable surgeon
to perform true radical operations.