Blumer's shelf, or the rectal shelf, is a finding palpable (felt) in rectal or vaginal examination that indicates that a tumor has metastasized to the pouch of Douglas.
It is usually a site of metastasis of cancers of the lung, pancreas and stomach,[1] due to metastatic tumor cells gravitating from an abdominal cancer and growing in the rectovesical[2] or rectouterine pouch.
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