Pics 7

UVA CAUSING EXTREME PHOTOAGING

Dysplastic Nevus

Dermatopathology of BCC

Actinic Keratosis

Histology of different skin cancers

Dermatopathology of an AK:

• KERATINOCYTES OF THE BASAL LAYER ARE ABNORMAL: EPIDERMIS EXHIBITS HYPERKERATOSIS AND PARAKERATOSIS

Dermatopathology of SCC

Bowen’s disease: Squamous Cell Carcinoma in-situ

Squamous cell carcinoma in-situ

SCC in-situ

SCC in-situ:

• In-situ SCC; uncircumcised men, may progress to invasive SCCErythroplasia of Queyrat

Invasive Squamous cell carcinoma

• Erythematous nodule, indurated lesion, Sun exposed skin, Men> women

  Slow growth

Keratoacanthoma:

Squamous Cell Carcinoma: Cutaneous Horn: Well differentiated squamous cell carcinoma

BCC

Nodular BCC

Superficial BCC

Pigmented BCC

Infiltrative (Morpheaform) BCC

BCC; Rodent Ulcers

Malignant Melanoma (MM)

Histopathology of Melanoma

Acral lentiginous melanoma

Superficial spreading melanoma

Acral lentiginous melanoma- very aggressive

Lentigo maligna melanoma

Nodular melanoma

Melanoma

Freckle (Ephelis)

Lentigo

Melanocytic Nevus: Mole

Dysplastic nevus

Verrucae (Warts)

Verruca Histology; Arrow = Cytoplasmic vacuolization (koilocytosis)

Herpes Simplex Virus

Herpes Simplex Virus

Herpes Simplex Virus

Herpes Simplex Virus

Herpes Simplex Virus Histology

Herpes Simplex Virus Infected Cell Syncytia

Varicella (Chickenpox)

Herpes zoster (Shingles)

Molluscum Contagiosa

Molluscum Body

Measles

Measles Histology

Rubella (German Measles)

Fifth Disease (Erythema infectosum

Hand-foot-mouth Disease

Herpangina

Abscess

Folliculitis

“Hot tub” folliculitis (Pseudomonas aeruginosa)

Cellulitis

Streptococci Impetigo

Scalded Skin syndrome

Erysipelas

Scarlet Fever

Necrotizing Fasciitis

Ecthyma gangrenosum-

Anthrax Lesions

Leprosy (Hansen Disease)

Lyme disease

Rocky Mountain Spotted Fever

Tinea capitis

Tinea corporis

Tinea pedis

Tinea versicolor; Caused by Malassezia furur

Malassezia furfur: KOH preparation Round yeast and elongated pseudohyphal

forms, so-called "spaghetti and meatballs."

Candidiasis: Diaper Dermatitis

Sporotrichosis

Leishmaniasis

Filariasis

Scabies (Sarcoptes scabiei)

Arthropod Bites

Pediculosis capitis

Erythema Multiforme

Erythema Multiforme

Erythema Nodosum

Erythema nodosum histology

Erythema induratum

Erythema induratum histology

Erythema induratum

histology

Erythema induratum vasculitis

Pancreatic Panniculitis

Pancreatic Panniculitis

Pancreatic Panniculitis

Pancreatic Panniculitis

Basal layer

• keratinocytes,including stem cells

• nonkeratinocytes, including melanocytes

Herpes Zoster

HERPES ZOSTER

Herpes Zoster - V1