Background: The isolated longstanding hypochromic hyposideremic anemia can be a unique symptom of the jejunal tumor.
Case Report: The authors present a case of 43-year-old woman with small intestine cancer, which manifested as longstanding anemia, decreased serum iron and remained undiagnosed over a period of several years. Special attention has been paid to the problem of adequate diagnostic procedure for disclosing the latent small intestine tumor.

Keywords: Iron deficiency anemia, small intestine carcinoma, diagnostics