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== Clinical Summary ==
This 39-year-old male had malignant hypertension with malignant nephrosclerosis, progressing to chronic renal failure. He underwent a bilateral nephrectomy for control of his hypertension and received a cadaveric renal transplant. He did well, although his bllod pressure was elevated and his BUN and creatinine were gradually rising despite aggressive treatment. A transplant nephrectomy was performed 4 years after his transplant and he resumed hemodialysis.
The kidney weighed 125 grams and was covered by a thick capsule, which was partially adherent to the cortex, but could be stripped from the kidney with slight difficulty. The cortex was thinned but calyces and pelvis of the kidney appeared normal. The vessels were not prominent. The renal arteries and vein appeared normal.
== Images ==
<gallery height="250px" widths="250px">
File:IPLab6ChronicRejection1IPLab6ChronicRejection1b.jpg|This is a low-power photomicrograph of the kidney from this case of chronic transplant rejection. Note the focal areas of hemorrhage and inflammatory cell infiltrate in this section. File:IPLab6ChronicRejection2.jpg|This is a higher-power photomicrograph of kidney containing a section of blood vessel that demonstrates a marked neointimal proliferative response (1). In this case the lumen of the artery is obliterated. Also note the cellular infiltrate in the interstitium of the kidney (2) and the paucity of tubules. File:IPLab6ChronicRejection3IPLab6ChronicRejection2b.jpg|This is a photomicrograph of kidney with a focal area of hemorrhage around a small blood vessel (left) congestion and congestion sclerosis of the glomeruli. Note that there is a marked loss of renal tubules throughout this section with replacement by fibrous connective tissue. Also note the cellularity of the glomeruli. File:IPLab6ChronicRejection4IPLab6ChronicRejection3b.jpg|This is another area of renal cortex similar to the previous image. Note the fibrosis (1) and loss of renal tubules throughout this section. Also note the focus of inflammatory cells (2) indicating that despite the chromic nature of this lesion, there is still ongoing active rejection and renal damage. File:IPLab6ChronicRejection5IPLab6ChronicRejection4b.jpg|This high-power photomicrograph of glomeruli from this kidney demonstrates congestion (1), demonstrating increased cellularity of glomeruli with mesangial expansion, (arrows). There is generalized loss of tubules and a glomerulus that is almost completely obliterated or sclerosed replacement by fibrosis in this section (21). File:IPLab6ChronicRejection6IPLab6ChronicRejection5b.jpg|This is a photomicrograph of rejected kidney with a focus of cellular infiltrate (left) infiltrates and a small artery with neointimal proliferation and stenosis (arrow).
File:IPLab6ChronicRejection7.jpg|This is a photomicrograph of a glomerulus with a mild cellular infiltrate (left) and a small damaged glomerulus (right). There is extensive interstitial fibrosis (1), loss of renal tubules, and the remaining tubules contain protein (2) indicating severe damage.
File:IPLab6ChronicRejection8.jpg|This is a high-power photomicrograph of renal cortex with cellular infiltrate and few remaining renal tubules. The cellular infiltrate comprises macrophages, activated (large) lymphocytes and a few neutrophils and plasma cells.
File:IPLab6ChronicRejection9IPLab6ChronicRejection9b.jpg|This is a high-power photomicrograph demonstrates the characteristic manifestations of a damaged chronic antibody-mediated rejection. The glomerulus. Note shows inflammatory cells within the loss of normal capillary structureloops (glomeruliitis), the accumulation of mesangial expansion matrix, and duplication (or multilamination) of the infiltration of large mononuclear cellscapillary basement membrane (arrow).
File:IPLab6ChronicRejection10.jpg|This is a high-power photomicrograph of a kidney from another case of chronic transplant rejection. In this case there is extensive damage to the kidney due to the chronic rejection (loss of tubules and glomerular lesions). In addition, this kidney was removed during an episode of acute rejection. The marked cellular infiltrate indicates acute rejection in a case of chronic transplant rejection.
File:IPLab6ChronicRejection11.jpg|This is a higher-power photomicrograph of kidney from the previous image demonstrating the cellular infiltrate which is comprised of lymphocytes, macrophages, plasma cells and a few neutrophils.
File:IPLab6ChronicRejection12.jpg|Photomicrograph from another region of previous image. Note the cellular infiltrate around a small blood vessel (right) and neutrophils within renal tubules (arrow).
</gallery>
== Virtual Microscopy ==
<peir-vm>IPLab6ChronicRejection</peir-vm>
== Study Questions ==
* <spoiler text="What is the pathogenetic mechanism of chronic transplant rejection?">Basically, chronic transplant rejection is the accumulated damage to the kidney that results from multiple episodes of acute transplant rejection. Despite immunosuppressive therapy, there is still some ongoing rejection and there are often flare-ups of acute rejection. Over time this cumulative damage results in loss of renal tissue and replacement by fibrous connective tissue.</spoiler>
* <spoiler text="Why does this case of chronic transplant rejection have cellular infiltrate and even some neutrophils (indicating acute inflammation)?">There is often ongoing rejection even in cases of long term transplant. This case and the images from the case of chronic rejection that was removed during an attack of acute rejection demonstrate the continuing ongoing nature of the rejection process.</spoiler>
* <spoiler text="What role do humoral antibodies play in chronic transplant rejection?">There is some controversy over this point. Some people think that since antibodies can be demonstrated in the vascular lesions (the intimal proliferation), these must be antibody-mediated. This is not necessarily true but the classic dogma is that chronic vascular rejection is both antibody-mediated and cell-mediated.</spoiler>
== Additional Resources ==
=== Reference ===
* [http://emedicine.medscape.com/article/429314-overview eMedicine Medical Library: Assessment and Management of the Renal Transplant Patient]
* [http://emedicine.medscape.com/article/430128-overview eMedicine Medical Library: Renal Transplantation]
* [http://emedicine.medscape.com/article/241640-overview eMedicine Medical Library: Malignant Hypertension]
* [http://www.merckmanuals.com/professional/cardiovascular_disorders/hypertension/hypertensive_emergencies.html Merck Manual: Hypertensive Emergencies]
* [http://www.merckmanuals.com/professional/genitourinary_disorders/renal_failure/chronic_kidney_disease.html Merck Manual: Chronic Kidney Disease]
* [http://www.merckmanuals.com/professional/genitourinary_disorders/renal_replacement_therapy/hemodialysis.html Merck Manual: Hemodialysis]
* [http://www.merckmanuals.com/professional/immunology_allergic_disorders/transplantation/kidney_transplantation.html Merck Manual: Kidney Transplantation]
=== Journal Articles ===
* Matas AJ. [http://www.ncbi.nlm.nih.gov/pubmed/11272615 Impact of acute rejection on development of chronic rejection in pediatric renal transplant recipients]. ''Pediatr Transplant'' 2000 May;4(2):92-9.
=== Images ===
* [{{SERVER}}/library/index.php?/tags/2146-rejection PEIR Digital Library: Rejection Images]
* [http://library.med.utah.edu/WebPath/IMMHTML/IMMIDX.html#4 WebPath: Transplant Rejection]
== Related IPLab Cases ==
* [[IPLab:Lab 1:Kidney Infarction|Lab 1: Kidney: Infarction (Coagulative Necrosis)]]
* [[IPLab:Lab 6:Acute Rejection|Lab 6: Kidney: Acute Transplant Rejection]]
* [[IPLab:Lab 10:Candidiasis|Lab 10: Kidney: Candidiasis]]
{{IPLab 6}}
[[Category: IPLab:Lab 6]]