Derm Path Lesions Flashcards
What type of lesion is this? Is this a primary or secondary lesion? What are some potential diseases you might see these with?
- Callus
- Primary lesion
- seen with trauma over a bony prominence such as elbow or sternum
What type of lesion is this? Is this a primary or secondary lesion? What are some instances you might see these?
- Comedo = a plug of stratum corneum and sebum (arrows) within the lumen of the hair follicle
- Primary lesion
- seen with canine actinic dermatitis, chin acne, hyperadrenocorticism, Schnauzer comedo syndrome
What type of lesion is this? Is it a primary or secondary lesion? What are some instances you might see these?
- Crust
- Secondary lesion; should be collected with the biopsy and examined b/c can help with diagnosis
- seen w/ chronic stage of pustular dz such as Staph infxn or pemphigus foliaceus
What type of lesion is this? Is this a primary or secondary lesion? What are some instances you might see these?
- cyst - cavity lined by epithelium and filled with liquid or semisolid material and located in the dermis or subcutis
- primary lesion
- e.g. follicular cyst, apocrine cyst, dermoid cyst
What type of lesion is this? Is this a primary or secondary lesion? What are some instances you might see these?
- Epidermal collarette - Flat to minimally elevated ring (arrows) of scale that enlarges peripherally
- Primary lesion
- e.g. superficial bacterial infxn, insect bite, fungal infx
What type of lesion is this? Is this a primary or secondary lesion? What are some instances you might see these?
- Erosion - loss of part of the epidermis; depressed, moist, glistening
- Secondary lesion
- e.g. secondary to vesicle or pustule rupture or secondary to surface trauma
What type of lesion is this? Is this a primary or secondary lesion? What are some instances you might see these?
- Excoriation - linear loss of epidermis
- Secondary lesion
- e.g. abrasion or scratch
What type of lesion is this? Is this a primary or secondary lesion? What are some instances you might see these?
- Fissure - linear crack or break from the epidermis to the dermis
- Primary lesion
- e.g. footpad fissue seen with pemphigus foliaceus, superficial necrolytic dermatitis, or digital hyperkeratosis
What type of lesion is this? Is this a primary or secondary lesion? What are some instances you might see these?
- Lichenification - rough, thickened epidermis secondary to peristent rubbing, scratching, or irritation
- secondary lesion
- e.g. chronic dermatitis
What type of lesion is this? Is this a primary or secondary lesion? What are some instances you might see these?
- Macule - flat, circumscribed area that is a change in the color of the skin, < 1 cm in diameter
- Primary lesion
- e.g. hemorrhage, lentigo, vitiligo
What type of lesion is this? Is this a primary or secondary lesion? What are some instances you might see these?
- Neoplasm
- Primary lesion
- e.g. lipoma, mast cell tumors, SCC
What type of lesion is this? Is this a primary or secondary lesion? What are some instances you might see these?
- Nodule - elevated, firm, circumscribed lesion 1-2 cm in diameter
- Primary lesion
- e.g. bacterial or fungal infection, infectious or sterile granuloma
What type of lesion is this? Is this a primary or secondary lesion? What are some instances you might see these?
- Papule - elevated, firm, circumscribed area < 1 cm in diameter
- Primary lesion
- e.g. insect bites, papilloma, superficial folliculitis
What type of lesion is this? Is this a primary or secondary lesion? What are some instances you might see these?
- Plaque - elevated, firm lesion with a flat top surface > 1 cm in diameter
- Primary lesion
- e.g. calcinosis cutis, reactive histiocytosis, eosinophilic plaque
What type of lesion is this? Is this a primary or secondary lesion? What are some instances you might see these?
-
Pustule - elevated superficial accumulation of purulent fluid within the epidermis
- 3 types:
- Neutrophilic - bacterial infxns, pemphigus foliaceus
- Eosinophilic - parasitic dz, allergic, immune, microbial
- Pautrier’s microabscesses
- 3 types:
- Primary lesion
What type of lesion is this? Is this a primary or secondary lesion? What are some instances you might see these?
- Scale - fragmented, keratinized cells, flaky skin, irregular, thick or thin, dry or oily
- Secondary lesion
- e.g. cornification disorders, sebaceous adenitis, ichthyosis
What type of lesion is this? Is this a primary or secondary lesion? What are some instances you might see these?
- Scar - think or thick fibrous tissue that replaces normal skin following injury or laceration to the dermis
- secondary lesion
- e.g. healed wound, surgical scar
What type of lesion is this? Is this a primary or secondary lesion? What are some instances you might see these?
- Ulcer - loss of epidermis and basement membrane with exposure of dermis, concave
- secondary lesion
- e.g. ischemic lesions resulting from vasculitis, indolent ulcer, feline herpesvirus infection, feline ulcerative dermatosis syndrome
What type of lesion is this? Is this a primary or secondary lesion? What are some instances you might see these?
- Vesicle - elevated, circumscribed, fluid-filled lesion < 1 cm in diameter
- Bulla - a large vesicular lesion > 1 cm in diameter
- Primary lesion
- e.g. secondary to marked spongiosis, ballooning degeneration, hydropic degeneration, acantholysis or basement membrane damage, bullous pemphigoid, or viral diseases
What type of lesion is this? Is this a primary or secondary lesion? What are some instances you might see these?
- Wheal - elevated, irregular-shaped area of cutaneous edema; solid, transient
- Primary lesion
- e.g. insect bites, urticaria, allergic rxn
