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Ochronosis is a dermatological disorder that results in the adverse pigmentation of cartilage from a long term buildup of phenylalanine or tyrosine.
In this disorder, a pigment substance resulting from incomplete catabolism of tyrosine and phenylalanine is deposited, over the years, in cartilage, the eye, and to a lesser degree in the skin.
[edit] Symptoms
Pigmented cartilage may appear blue due to scattering phenomenon, and to a lesser degree this may be true for skin with dermal deposition of this pigment. The skin of the axilla is very likely to be pigmented due to deposits of homogentisic acid in sudoriferous glands in these areas. The clinical features of this metabolic disorder are dark urine, pigmentation of the skin and arthritis. Particularly helpful is the almost constant presence of a patch of pigmentation (gray to brown in color) in the sclera, between the margin of the cornea and the outer or inner canthus. Because of the bluish color produced by the deep pigmentation, this condition may be confused with argyria.
[edit] See also
[edit] References
- Jeghers - New England Journal of Medicine, Vol. 231: 122 & 181,1944
- The University of Massachusetts Online Article on Skin Pigmentation Disorders [1]
|
Metabolic pathology (E70-90) |
| Amino acid |
Phenylketonuria - Alkaptonuria - Ochronosis - Tyrosinemia - Maple syrup urine disease - Propionic acidemia - Methylmalonic acidemia - Isovaleric acidemia - Primary carnitine deficiency - Cystinuria - Cystinosis - Hartnup disease - Homocystinuria - Citrullinemia - Hyperammonemia - Glutaric acidemia type 1 |
| Carbohydrate |
Lactose intolerance - Glycogen storage disease (type I, type II, type III, type IV, type V, type VI), Fructose intolerance, Galactosemia |
| Lipid |
Lipid storage disorders Sphingolipidoses: Gangliosidosis - GM2 gangliosidoses (Sandhoff disease, Tay-Sachs disease) - GM1 gangliosidoses - Mucolipidosis type IV - Gaucher's disease - Niemann-Pick disease - Farber disease - Fabry's disease - Metachromatic leukodystrophy - Krabbe disease
Neuronal ceroid lipofuscinosis (Batten disease) - Cerebrotendineous xanthomatosis - Cholesteryl ester storage disease (Wolman disease)
Hyperlipidemia - Hypercholesterolemia - Familial hypercholesterolemia - Xanthoma - Combined hyperlipidemia - Lecithin cholesterol acyltransferase deficiency - Tangier disease - Abetalipoproteinemia |
| Mineral |
Cu Wilson's disease/Menkes disease - Fe Haemochromatosis - Zn Acrodermatitis enteropathica - PO43− Hypophosphatemia/Hypophosphatasia - Mg2+ Hypermagnesemia/Hypomagnesemia - Ca2+ Hypercalcaemia/Hypocalcaemia/Disorders of calcium metabolism |
| Fluid, electrolyte and acid-base balance |
Electrolyte disturbance - Na+ Hypernatremia/Hyponatremia - Acidosis (Metabolic, Respiratory, Lactic) - Alkalosis (Metabolic, Respiratory) - Mixed disorder of acid-base balance - H2O Dehydration/Hypervolemia - K+ Hypokalemia/Hyperkalemia - Cl− Hyperchloremia/Hypochloremia |
| Porphyrin and bilirubin |
Acatalasia - Gilbert's syndrome - Crigler-Najjar syndrome - Dubin-Johnson syndrome - Rotor syndrome - Porphyria (Acute intermittent porphyria, Gunther's disease, Porphyria cutanea tarda, Erythropoietic protoporphyria, Hepatoerythropoietic porphyria, Hereditary coproporphyria, Variegate porphyria) |
| Glycosaminoglycan |
Mucopolysaccharidosis - Hurler syndrome - Hunter syndrome - Sanfilippo syndrome - Morquio syndrome |
| Glycoprotein |
I-cell disease - Pseudo-Hurler polydystrophy - Aspartylglucosaminuria - Fucosidosis - Alpha-mannosidosis - Sialidosis |
| Other |
Alpha 1-antitrypsin deficiency - Cystic fibrosis - Familial Mediterranean fever - Lesch-Nyhan syndrome |
