Amyloid

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Amyloid
Diagnosis in short

Cardiac amyloidosis. H&E stain.
LM typically extracellular, amorphous (no specific shape), acellular and pink (on H&E stain) -- cotton candy like, classically has a "cracked" appearance
Subtypes multiple subclassifications: Robbins (AL amyloidosis, AA amyloidosis, non-AA and non-AL), set of six subtypes (primary (AL amyloidosis), secondary (AA amyloidosis, hemodialysis-related, localized), hereditary, senile systemic amyloidosis)
LM DDx fibrin, collagen, smooth muscle
Stains Congo red +ve
EM non-branching fine fibrils - usually 8-12 nm in diameter (accepted range 8-15 nm)
Molecular beta sheet
Gross waxy appearance
Site pretty much anywhere, blood vessels
Associated Dx very many
Clinical history variable
Prevalence uncommon
Prognosis dependent on subtype

Amyloid is one of those things clinicians can put in many differential diagnoses. The pathologist can diagnose it.

This article is a general overview of the topic. Links are provided to articles that deal with amyloidosis at specific sites, see specific site section below.

Overview

Definition

  • Disorder of protein folding - structure: beta sheet.[1]

Appearance

Light microscopy

Features:[2]

  • Pink (on H&E stain).
  • Extracellular location.
  • Amorphous - no specific shape.
  • May have a "cracked" appearance.[citation needed]

DDx - ABCs of pink:

  • Amyloid.
  • Blood (fibrin).
  • Collagen.
  • Smooth muscle.

Images

  • Amyloid - H&E stain. (WC)

  • Amyloid - congo red stain. (WC)

Electron microscopy

Features:[3]

  • Fine fibrils, non-branching.
    • Usually 8-12 nm in diameter; accepted range 8-15 nm.[4]

Images:

DDx

  • CADASIL (cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy).
    • Typically has basophilic granularity in the blood vessels.[5]

Stains

  • Congo red +ve.
    • Positive:[6]
      • Orange/light red (non-polarizaed light).
      • Apple green birefringence (polarized light).
    • Negative:
      • Blue birefringence (polarized light) = collagen fibers.[7]
  • Thioflavin T stain.[8]
  • Sodium sulphate-Alcian Blue stain +ve.[9]

Sign out

BONE LESION, RIGHT ILIAC, BIOPSY:
- AMYLOID ASSOCIATED WITH HISTOCYTES, GIANT CELLS AND A FEW LYMPHOCYTES
  AND PLASMA CELLS.

COMMENT:
The presence of amyloid is confirmed with congo red staining and polarization.

There are no histomorphologic findings suggestive of a plasma cell neoplasm
in this biopsy.

Clinical correlation with serum protein electrophoresis, urine protein electrophoresis
and bone marrow sampling is suggested.

Associations - DDx

Classification

Amyloidosis can be classified a number of different ways.

Six subtypes classification

Amyloid classified into six groups:[6]

  1. Primary (AL amyloidosis).
    • Monoclonal light chains in serum and/or urine, may be due to plasma cell dyscrasia.
  2. Secondary (AA amyloidosis).
  3. Hemodialysis-related.
    • Beta-2 microglobulin.[13]
  4. Localized.
  5. Hereditary.
  6. Senile systemic amyloidosis.

How to remember: Two As = secondary amyloidosis.

Three main types - Robbins classification

Amyloid classified into three groups:[1]

  1. AL amyloidosis - "AL" = Amyloid Light chain.[16]
    • Primary amyloidosis.[10]
    • Bence Jones protein (light chains -- kappa or lambda) +ve -- necessary for amyloidosis but not sufficient.[17]
  2. AA amyloidosis - "AA" = Amyloid Associated.[18]
    • Secondary amyloidosis.
  3. Abeta amyloid - found in Alzheimer's disease.[19]

Additional types:

  • ATTR = Amyloid Transthyretin (TTR)
    • Transthyretin - serum protein that transport thyroxine and retinol; transthyretin AKA prealbumin.

Treatment

The very short version:

  • AL - chemotherapy & stem cell transplant.[6]
  • AA - treat underlying cause.[6]

Classification of amyloid - differentiation

Biochemical techniques

  • Pre-treated with potassium permanganate, to obliterate congo red reactivity, was though be definitive for AA amyloidosis;[20] this is now generally considered to be unreliable.[21]

Immunohistochemistry

  • IHC may be useful for the subclassification of amyloidoses.[22]
    • The reliability of IHC for the subclassification of amyloidoses is thought to be low.[23][24]
      • Extreme caution is advised when interpreting IHC results.

Possibly useful immunostains:

  • Kappa.
  • Lambda.
  • Transthyretin.
    • The name transthyretin is from transports thyroxine and retinol (previous unknown as prealbumin).

Mass spectroscopy

  • Can be typed using mass spectroscopy.[25]
    • Considered to be the definitive test.[24][26]
      • High specificity and sensitivity vis-à-vis clinicopathologic correlation.[27]
    • May be done on formalin-fixed paraffin embedded (FFPE) material.[27]

Types

Secondary amyloidosis

  • AKA AA amyloidosis.
  • Pathophysiology: acute-phase reactant serum amyloid A (SAA) - degraded + deposits.[10][28]

Cerebral amyloid angiopathy

Main article: Cerebral amyloid angiopathy

A common cause of lobar hemorrhage (cerebral cortex, cerebellar cortex) in the elderly.

Senile systemic amyloidosis

  • Abbreviated SSA.

General

  • Previously known as senile cardiac amyloidosis.[29]
  • May be referred to as ATTR = amyloidosis TTR; in SSA the TTR is not mutated.
    • There is a hereditary form of amyloidosis with mutated TTR deposition known as ATTR type FAP = ATTR type Familial Amyloid Polyneuropathy.

Epidemiology:

  • Common in the elderly, as the word senile suggests.
  • Found in approx. 25% of elderly over 80 years old,[29] and in upto 65% of patients over 90 years old.[30]

Treatment:

  • No effective treatment.

Gross pathology

  • Grey/black "peppering" of left atrial endocardium - in fixed specimens.[31]
    • "Peppering" should be present if severe.

Microscopic

Features:

  • Heart most commonly involved, followed by lungs and then by kidney (renal papilla).
  • DDx of pink of H&E is important to remember: amyloid, muscle, collagen, clotted blood.
    • Amyloid vs. Fibrosis? Subendocardial fibrosis may have rim of (diffusion) preserved myocytes. (???)
  • Amyloid often present in the subepicardial tissue[30] - less commonly affected by ischemia.

Images

  • Senile systemic amyloidosis - H&E. (WC)

  • Senile systemic amyloidosis - congo red. (WC)

  • Senile systemic amyloidosis - Movat's. (WC)

Site specific

Abdomen

Abdominal fat pad biopsy redirects here.

General

  • Abdominal fat pad biopsy - common screen for amyloidosis.
    • May be done with FNA.
      • Suffers for poor sensitivity.[7]

Microscopic

Features:

  • Small-to-intermediate sized arteries with a thickened amorphous eosinophilic media.
    • Thickening classically nodular.
    • Apple green-birefringence -- with polarization.

Note:

  • Evaluation of at least 15 small blood vessels is recommended.[7]

Sign out

SOFT TISSUE, ABDOMEN, BIOPSY:
- AMYLOIDOSIS.

Negative

SOFT TISSUE, ABDOMEN, BIOPSY:
- BENIGN FIBROADIPOSE TISSUE.
- NEGATIVE FOR AMYLOIDOSIS WITH CONGO RED STAINING AND POLARIZED LIGHT.

COMMENT:
Correlation with serum protein electrophoresis, urine protein electrophoresis
and bone marrow sampling should be considered within the clinical context.

Cardiac amyloidosis

General

Cardiac amyloidosis - subtypes:

  1. AL amyloidosis - associated with plasma cell dyscrasia - most common cardiac amyloidosis.[30]
  2. Senile systemic amyloidosis - TTR-related amyloidosis (unmutated TTR).
  3. Hereditary amyloidosis.
  4. AA amyloidosis is uncommon.

Clinical:

  • CHF, conduction abnormalities.
  • Kidney disease (proteinuria) - associated with AL amyloidosis.

Pulmonary amyloidosis

Main article: Pulmonary amyloidosis
  • Very rare.

Renal amyloidosis

Main article: Medical kidney diseases

General

  • Both AL and AA amyloidosis can affect the kidney.[8]

Clinical:

Microscopic

Features:

  • Paucicellular mesangial expansion.
  • Fluffy hyaline material in medium-sized blood vessels.

DDx:

Images

  • Renal amyloidosis - high mag. (WC)

  • Renal amyloidosis - high mag. (WC)

  • Renal amyloidosis - very high mag. (WC)

www:

Urinary bladder amyloidosis

Main article: Urinary bladder amyloidosis

GI amyloidosis

  • GI amyloidosis can lead to obstruction and usually is greatest in the small bowel.[6]

Liver amyloidosis

Main article: Liver amyloidosis

Features:

  • Parenchymal deposition (common).
  • Portal triad deposition (less common).

Gastric amyloidosis

Main article: Amyloidosis of the stomach

Bone

Amyloid is reported in association with:

See also

References

  1. ↑ 1.0 1.1 Lachmann HJ, Hawkins PN (2006). "Amyloidosis and the lung". Chron Respir Dis 3 (4): 203-14. PMID 17190124. http://crd.sagepub.com/cgi/pmidlookup?view=long&pmid=17190124.
  2. ↑ Cotran, Ramzi S.; Kumar, Vinay; Fausto, Nelson; Nelso Fausto; Robbins, Stanley L.; Abbas, Abul K. (2005). Robbins and Cotran pathologic basis of disease (7th ed.). St. Louis, Mo: Elsevier Saunders. pp. 259. ISBN 0-7216-0187-1.
  3. ↑ 3.0 3.1 URL: http://www.fondazionedamico.org/biopsiarenale_atlas/seco/amil/amil21.htm. Accessed on: 9 November 2010.
  4. ↑ Alpers, CE.; Kowalewska, J. (Jan 2008). "Fibrillary glomerulonephritis and immunotactoid glomerulopathy.". J Am Soc Nephrol 19 (1): 34-7. doi:10.1681/ASN.2007070757. PMID 18045849.
  5. ↑ Kleinschmidt-DeMasters BK, Prayson RA (November 2006). "An algorithmic approach to the brain biopsy--part I". Arch. Pathol. Lab. Med. 130 (11): 1630–8. PMID 17076524.
  6. ↑ 6.0 6.1 6.2 6.3 6.4 Ebert EC, Nagar M (March 2008). "Gastrointestinal manifestations of amyloidosis". Am. J. Gastroenterol. 103 (3): 776-87. doi:10.1111/j.1572-0241.2007.01669.x. PMID 18076735.
  7. ↑ 7.0 7.1 7.2 Devata, S.; Hari, P.; Markelova, N.; Li, R.; Komorowski, R.; Shidham, VB. (2011). "Detection of amyloid in abdominal fat pad aspirates in early amyloidosis: Role of electron microscopy and Congo red stained cell block sections.". Cytojournal 8: 11. doi:10.4103/1742-6413.82278. PMID 21760829.
  8. ↑ 8.0 8.1 Nishi S, Alchi B, Imai N, Gejyo F (April 2008). "New advances in renal amyloidosis". Clin. Exp. Nephrol. 12 (2): 93-101. doi:10.1007/s10157-007-0008-3. PMID 18175051.
  9. ↑ Pomerance, A.; Slavin, G.; McWatt, J. (Jan 1976). "Experience with the sodium sulphate-Alcian Blue stain for amyloid in cardiac pathology.". J Clin Pathol 29 (1): 22-6. PMID 55419.
  10. ↑ 10.0 10.1 10.2 10.3 10.4 10.5 Amyloidosis. Merck Manual. URL: http://www.merck.com/mmpe/sec12/ch160/ch160a.html. Accessed on: 3 December 2009.
  11. ↑ Cotran, Ramzi S.; Kumar, Vinay; Fausto, Nelson; Nelso Fausto; Robbins, Stanley L.; Abbas, Abul K. (2005). Robbins and Cotran pathologic basis of disease (7th ed.). St. Louis, Mo: Elsevier Saunders. pp. 261. ISBN 0-7216-0187-1.
  12. ↑ Cotran, Ramzi S.; Kumar, Vinay; Fausto, Nelson; Nelso Fausto; Robbins, Stanley L.; Abbas, Abul K. (2005). Robbins and Cotran pathologic basis of disease (7th ed.). St. Louis, Mo: Elsevier Saunders. pp. 261. ISBN 0-7216-0187-1.
  13. ↑ Cotran, Ramzi S.; Kumar, Vinay; Fausto, Nelson; Nelso Fausto; Robbins, Stanley L.; Abbas, Abul K. (2005). Robbins and Cotran pathologic basis of disease (7th ed.). St. Louis, Mo: Elsevier Saunders. pp. 260. ISBN 0-7216-0187-1.
  14. ↑ URL: http://www.umm.edu/altmed/articles/amyloidosis-000007.htm. Accessed on: 23 October 2010.
  15. ↑ URL: http://library.med.utah.edu/WebPath/EXAM/IMGQUIZ/enfrm.html. Accessed on: 6 December 2010.
  16. ↑ Comenzo, RL.; Vosburgh, E.; Falk, RH.; Sanchorawala, V.; Reisinger, J.; Dubrey, S.; Dember, LM.; Berk, JL. et al. (May 1998). "Dose-intensive melphalan with blood stem-cell support for the treatment of AL (amyloid light-chain) amyloidosis: survival and responses in 25 patients.". Blood 91 (10): 3662-70. PMID 9573002.
  17. ↑ Cotran, Ramzi S.; Kumar, Vinay; Fausto, Nelson; Nelso Fausto; Robbins, Stanley L.; Abbas, Abul K. (2005). Robbins and Cotran pathologic basis of disease (7th ed.). St. Louis, Mo: Elsevier Saunders. pp. 261. ISBN 0-7216-0187-1.
  18. ↑ Cotran, Ramzi S.; Kumar, Vinay; Fausto, Nelson; Nelso Fausto; Robbins, Stanley L.; Abbas, Abul K. (2005). Robbins and Cotran pathologic basis of disease (7th ed.). St. Louis, Mo: Elsevier Saunders. pp. 259. ISBN 0-7216-0187-1.
  19. ↑ Cotran, Ramzi S.; Kumar, Vinay; Fausto, Nelson; Nelso Fausto; Robbins, Stanley L.; Abbas, Abul K. (2005). Robbins and Cotran pathologic basis of disease (7th ed.). St. Louis, Mo: Elsevier Saunders. pp. 259. ISBN 0-7216-0187-1.
  20. ↑ van Rijswijk MH, van Heusden CW (October 1979). "The potassium permanganate method. A reliable method for differentiating amyloid AA from other forms of amyloid in routine laboratory practice". Am. J. Pathol. 97 (1): 43–58. PMC 2042379. PMID 495695. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2042379/.
  21. ↑ Picken, MM. (Apr 2010). "Amyloidosis-where are we now and where are we heading?". Arch Pathol Lab Med 134 (4): 545-51. doi:10.1043/1543-2165-134.4.545. PMID 20367306.
  22. ↑ Röcken C (December 2009). "[Update on immunohistological classification of amyloidoses]" (in German). Pathologe 30 Suppl 2: 121–3. doi:10.1007/s00292-009-1183-7. PMID 19756621.
  23. ↑ Solomon, A.; Murphy, CL.; Westermark, P. (Jan 2008). "Unreliability of immunohistochemistry for typing amyloid deposits.". Arch Pathol Lab Med 132 (1): 14; author reply 14-5. doi:10.1043/1543-2165(2008)132[14b:IR]2.0.CO;2. PMID 18181665. http://www.archivesofpathology.org/doi/pdf/10.1043/1543-2165%282008%29132%5B14b%3AIR%5D2.0.CO%3B2.
  24. ↑ 24.0 24.1 Murphy CL, Eulitz M, Hrncic R, et al. (July 2001). "Chemical typing of amyloid protein contained in formalin-fixed paraffin-embedded biopsy specimens". Am. J. Clin. Pathol. 116 (1): 135–42. doi:10.1309/TWBM-8L4E-VK22-FRH5. PMID 11447744.
  25. ↑ Chee, CE.; Lacy, MQ.; Dogan, A.; Zeldenrust, SR.; Gertz, MA. (Jun 2010). "Pitfalls in the diagnosis of primary amyloidosis.". Clin Lymphoma Myeloma Leuk 10 (3): 177-80. doi:10.3816/CLML.2010.n.027. PMID 20511161.
  26. ↑ Murphy CL, Wang S, Williams T, Weiss DT, Solomon A (2006). "Characterization of systemic amyloid deposits by mass spectrometry". Meth. Enzymol. 412: 48–62. doi:10.1016/S0076-6879(06)12004-2. PMID 17046651.
  27. ↑ 27.0 27.1 Vrana JA, Gamez JD, Madden BJ, Theis JD, Bergen HR, Dogan A (December 2009). "Classification of amyloidosis by laser microdissection and mass spectrometry-based proteomic analysis in clinical biopsy specimens". Blood 114 (24): 4957–9. doi:10.1182/blood-2009-07-230722. PMID 19797517.
  28. ↑ Cotran, Ramzi S.; Kumar, Vinay; Fausto, Nelson; Nelso Fausto; Robbins, Stanley L.; Abbas, Abul K. (2005). Robbins and Cotran pathologic basis of disease (7th ed.). St. Louis, Mo: Elsevier Saunders. pp. 260. ISBN 0-7216-0187-1.
  29. ↑ 29.0 29.1 Ikeda, S. (Dec 2004). "Cardiac amyloidosis: heterogenous pathogenic backgrounds.". Intern Med 43 (12): 1107-14. PMID 15645642.
  30. ↑ 30.0 30.1 30.2 Sharma, PP.; Payvar, S.; Litovsky, SH.. "Histomorphometric analysis of intramyocardial vessels in primary and senile amyloidosis: epicardium versus endocardium.". Cardiovasc Pathol 17 (2): 65-71. doi:10.1016/j.carpath.2007.05.008. PMID 18329550.
  31. ↑ Pomerance, A. (Sep 1965). "Senile cardiac amyloidosis.". Br Heart J 27 (5): 711-8. PMID 5829755. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC469777/pdf/brheartj00340-0085.pdf.
  32. ↑ Cardiac amyloidosis. Medlineplus.org. URL: http://www.nlm.nih.gov/medlineplus/ency/article/000193.htm. Accessed on: 3 December 2009.
  33. ↑ Satoskar, AA.; Burdge, K.; Cowden, DJ.; Nadasdy, GM.; Hebert, LA.; Nadasdy, T. (Jun 2007). "Typing of amyloidosis in renal biopsies: diagnostic pitfalls.". Arch Pathol Lab Med 131 (6): 917-22. doi:10.1043/1543-2165(2007)131[917:TOAIRB]2.0.CO;2. PMID 17550319. http://www.archivesofpathology.org/doi/full/10.1043/1543-2165(2007)131%5B917:TOAIRB%5D2.0.CO;2.
  34. ↑ Petruzziello, F.; Zeppa, P.; Catalano, L.; Cozzolino, I.; Gargiulo, G.; Musto, P.; D'Auria, F.; Liso, V. et al. (May 2010). "Amyloid in bone marrow smears of patients affected by multiple myeloma.". Ann Hematol 89 (5): 469-74. doi:10.1007/s00277-009-0857-9. PMID 19894050.
  35. ↑ Alabi, ZO.; Ojo, OS.; Odesanmi, WO. (1991). "Secondary amyloidosis in chronic osteomyelitis.". Int Orthop 15 (1): 21-2. PMID 2071276.
  36. ↑ Miossec, P.; Lormeau, B.; Valensi, P.; Arthuis, F.; Amouroux, J.; Attali, JR. (Sep 1999). "Bone amyloidoma in a diabetic patient with morbid obesity.". Diabetes Metab 25 (3): 261-3. PMID 10499196.


External links

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