Lesions SDL Flashcards
(33 cards)
what do linear lesions indicate
external trauma or lesions associated with a blood vessel, dermatome or a congenital malformation
What do annular lesions indicate
annular lesions usually indicate peipheral spreading of disease as a pyoderm or demophytosis
name the lesison
linear
name the lesion
annular
what do symmetrical lesions often indicate
systemically mediated disease
what is a macule
a circumscribed flat area of change in coloud of the skin less than 1 cm in diameter
what is a patch
same as a macule (change in skin colour) exceeding 1 cm in diameter
what is petechiae
pin point macules caused by hemorrhage of less than 1 cm in diameter
what is ecchymoses
pathces caused by hemorrhage of more than 1 cm in diameter
this is an example of what lesion
macules
what is a papule
small solid elevation of the skin less than 1 cm in diameter
what is a plaque
a large flatter elevation of the skin, sometimes formed by papules coalescing. a common example is the eosinophilic plaque seen in some cats with allergic skin disease
what is a nodule
a solid elevation of the skin greater than 1 cm in diameter that usually extends into the deeper skin layers
- can result from neoplasia, inflammatory cell accumulation or tissue dysplaysia/hyperplasia or mineral deposition
what is a tumour
a large mass involving skin structures. the term is often used in relation to neoplasia but can technically be used in inflammatory disease
what is a cyst
a cavity with an epithelial lining
what is a pustule
a small circumscribed elevation of the epidermis containing pus
what is a vesicle
a small circumscribed elevation of the epidermis containing clear fluid less than 1 cm
what is a bulla
a circumscribed elevation of the epidermis containing clear fluid more than 1 cm in diameter
what is a wheal
a circumscribed raised lesion consisting of dermal oedema
- usually reflect localised mast cell degranulation within the skin
what are scales
an accumulation of loose cornified fragments of the epidermis
what is a comedone
a dilated hair follicle devoid of hair and plugged with keratinous debris (a blackhead)
what is a follicular cast
an accumulation of keratinous debris around the hair shaft seen protruding from the follicular ostium or present when hairs are plucked and examined
what is a crust
a dried exudate on the skin sruface, either serum, blood, pus or a combo
what is an erosion
a break in the continuity of the epidermis that does not penetrate the basement membrane
