1. Intravenous Tamm-Horsfall Protein Polyps: Report of a Case in Association With a Hematoma That Mimicked a Renal Neoplasm 
John P.T. Higgins, MD, Philip Huie, MS, Gilbert Rigaud, MD, Richard K. Sibley, MD 
American Journal of Kidney Diseases 
Volume 48, Issue 5, Pages e67-e71 (November 2006)
DOI: /j.ajkd
Copyright © 2006 National Kidney Foundation, Inc. Terms and Conditions

2. Fig 1
Computed tomographic scan of the abdomen showing left renal mass. *Cystic mass in the left kidney.
American Journal of Kidney Diseases  , e67-e71DOI: ( /j.ajkd )
Copyright © 2006 National Kidney Foundation, Inc. Terms and Conditions

3. Fig 2
The margin of the mass. On the right, the mass consists of necrotic renal parenchyma with hemorrhage. This transitions into viable renal parenchyma on the left, from which it is not separated by a fibrous capsule. (Hematoxylin and eosin stain; original magnification ×40.)
American Journal of Kidney Diseases  , e67-e71DOI: ( /j.ajkd )
Copyright © 2006 National Kidney Foundation, Inc. Terms and Conditions

4. Fig 3
Low-magnification view to show involvement of several veins by THP polyps. Several large-caliber veins are occluded partially or completely by fibrin and paucicellular mucoid material (arrows). An arcuate artery is unremarkable (*). (Hematoxylin and eosin stain; original magnification ×40.)
American Journal of Kidney Diseases  , e67-e71DOI: ( /j.ajkd )
Copyright © 2006 National Kidney Foundation, Inc. Terms and Conditions

5. Fig 4
Arcuate vein containing THP polyp. Endothelium covers portions of the polyp adjacent to the residual lumen. (Hematoxylin and eosin stain; original magnification ×200.)
American Journal of Kidney Diseases  , e67-e71DOI: ( /j.ajkd )
Copyright © 2006 National Kidney Foundation, Inc. Terms and Conditions

6. Fig 5
Immunohistochemical stain for THP in the renal medulla. Cytoplasmic staining of distal tubules confirms the specificity of the antibody for THP. (Hematoxylin counterstain; original magnification ×200.)
American Journal of Kidney Diseases  , e67-e71DOI: ( /j.ajkd )
Copyright © 2006 National Kidney Foundation, Inc. Terms and Conditions

7. Fig 6
(Left) Hematoxylin and eosin–stained section shows intravenous THP polyp. (Right) Immunohistochemical stain for THP highlights a venous polyp. THP also is abnormally present in Bowman space of the adjacent glomeruli. (Hematoxylin counterstain; original magnification ×200.)
American Journal of Kidney Diseases  , e67-e71DOI: ( /j.ajkd )
Copyright © 2006 National Kidney Foundation, Inc. Terms and Conditions