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Finance Minister Masajuro Shiokawa has been diagnosed as having acute gallbladder inflammation caused by gallstones, ministry officials said Thursday.

The 81-year-old Shiokawa was hospitalized Wednesday and is expected to remain there for about a week, the officials said.

He was in stable condition after undergoing treatment Wednesday evening, they said.

Shiokawa canceled a trip to Thailand to attend a meeting of finance ministers of the Asia-Pacific Economic Cooperation forum starting Thursday after experiencing stomach problems.