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Recognition and Description of Lesions (view source)
Revision as of 12:39, 15 February 2011
, 12:39, 15 February 2011no edit summary
====Black or Brown/ Black====
====Black or Brown/ Black====
* This pigmentation may be due to
* This pigmentation may be due to
** [[Pigmentation and Calcification - Pathology#Melanin|Melanin]]
** [[Pigmentation - Pathology#Melanin|Melanin]]
** [[Pigmentation and Calcification - Pathology#Carbon (Anthracosis)|Exogenous carbon]]
** [[Pigmentation - Pathology#Carbon (Anthracosis)|Exogenous carbon]]
** Putrefactive bacteria
** Putrefactive bacteria
** [[Pigmentation and Calcification - Pathology#Haemosiderin|Haemosiderin]].
** [[Pigmentation - Pathology#Haemosiderin|Haemosiderin]].
* Examples
* Examples
** If the lesion is a mass, consider a melanoma.
** If the lesion is a mass, consider a melanoma.
*** Hydrogen sulphide from gastro-intestinal bacteria can give black discolouration
*** Hydrogen sulphide from gastro-intestinal bacteria can give black discolouration
**** Known as pseudomelanosis
**** Known as pseudomelanosis
** [[Pigmentation and Calcification - Pathology#Haemosiderin|Haemosiderosis]] (brown to golden brown).
** [[Pigmentation - Pathology#Haemosiderin|Haemosiderosis]] (brown to golden brown).
*** Implies old/ chronic congestion or [[Haemorrhage|haemorrhage]].
*** Implies old/ chronic congestion or [[Haemorrhage|haemorrhage]].
* Yellow pigmentation can be given by:
* Yellow pigmentation can be given by:
** Fat
** Fat
** Bile pigment (bilirubin)
** Bile pigment ([[Bilirubin|bilirubin]])
** Fibrin
** Fibrin
** [[Oedema#Composition of oedema fluid|Cellular exudates]]
** [[Oedema#Composition of oedema fluid|Cellular exudates]]