Primary renal carcinoid tumor

Primary renal carcinoid tumor (PRCT) is extremely rare since normally no enterochromaffin cells will be found in renal parenchyma. The clinical manifestations of PRCT are often non-specific, sometimes even without symptoms. There were about 90 cases reported in the literatures to our knowledge. We reported a PRCT in a 67-year-old woman, which was incidentally found in the health examination. The literature was reviewed. We suggest that PRCT should be considered when a renal tumor coexists with horseshoe kidney or a renal mass shows hypovascularity on the angiography.