Presentation on theme: "Dermatology for Primary Care:"— Presentation transcript:
1Dermatology for Primary Care: Recognizing Common Skin TumorsAlbert G. Caruana Jr., MDResident’s ConferenceApril 23, 2004Presbyterian Hospital of Dallas
2AcrochordonHave various names: fibroepithelial polyp, skin tag, squamous papilloma.Oval skin excrescence on a broad or narrow stalk, can be brown or flesh colored.A pedunculated tumor.Occur more frequently in obese patients.Location: axilla (48%), neck (35%), also inguinal region.Majority of patients (78%) have less than 3 lesions per area.They begin to appear after 2nd decade of life.They cease growing after the 5th decade of life.
3AcrochordonComposed mainly of loose fibrous tissue (like superficial dermis), covered by thin layer of epidermis.They are benign.Can be irritating to patients (caught in clothes and jewelry).Treatment:Can be snipped off by scissorselectrocautery
4AcrochordonAcrochordon: “skin tags.” Round, black-colored, fleshy excrescences on abroad or narrow stalk (left). Clustering of lesions, the groin here, is commonin patients with obesity.
5AcrochordonAcrochordon: “skin tags.” Can present on or around the eyelid (left) or oftenin the axilla (right). Axilla and neck are most common locations.
6Seborrheic KeratosisThe most common benign skin neoplasm. No malignant potential.Origin is unknown.Become more frequent as we age.Diagnosis is easy to make clinically, biopsy is usually not necessary.Study has shown clinical diagnostic accuracy of 99% by dermatologists.Tend to occur on trunk most often, but can appear on head and extremities.Lesions contained entirely in epidermis, treat with cryosurgery or curettage.
7Seborrheic Keratosis Appearance: Size can range from 0.2 to 3.0 cm in diameter.Can have smooth surface or be rough and cracked.Characteristic “stuck-on” appearance.Color can be tan, brown, or black.The height of the lesion can vary.Can resemble melanoma (SK has uniform surface appearance).Key to visual diagnosis is identification of horn cystsBlack or pearly-white cysts either embedded in or on the surface of the lesion.These are dilated follicular ostia filled with keratin.
8Seborrheic KeratosisSeborrheic Keratoses: tend to occur in sun-exposed areas. These patientshave many on the back, but none on the buttocks.
9Seborrheic KeratosisSeborrheic Keratosis: May be flat with some scale (left) orraised (right) with deep cracks.
10Seborrheic KeratosisSeborrheic Keratosis: have characteristic horn cysts. They canbe white and deeper seated (left) or black and superficial (right).
11Seborrheic KeratosisSeborrheic Keratoses: flat lesions are often brown, can often form near hairline(left). They also commonly can be found under the breasts, where they canBecome red and macerated (right).
12Seborrheic Keratosis: Melanoma Look-Alikes Seborrheic Keratosis: Has dark pigmentation, irregular borders, andsome variation of color, but horn cysts help to make diagnosis clinically.
14Seborrheic Keratosis Inflammed SK’s: Have swollen and irregular borders.Develop an erythematous base.Can develop nummular dermatitis around edges.Common in intertriginous areas where skin is macerated.ItchingDevelop inflammation around other SK’s that are not mechanically aggravated.Severely affected lesions can appear like oozing, red masses with a friable surface. Confused with melanoma or pyogenic granuloma.Treat with topic steroids or remove all lesions.
15Seborrheic Keratosis: Inflammed SK’s Seborrheic Keratosis: Often only one lesion is inflammed, but many canbecome inflamed at once (left). This lesion has minimal inflammationat the base (right).
16Seborrheic Keratosis: Inflammed SK’s Seborrheic Keratosis: As inflammation worsens, scale may obscuretypical features (left). With severe inflammation, mass may oozeAnd lose all typical features (right).
17Dermatosa Papulosa Nigra Multiple brown to black dome-shaped papules.Occur on face of young to middle-aged African Americans.Thought to be a type of seborrheic keratosis.
18Keratoacanthoma A common benign epithelial tumor. Thought to be a variant of squamous cell carcinoma.Unknown etiology.Incidence 104 per 100,000.Mean age of onset is 64 years. Disease of elderly.Seasonal association implies role of UV radiation in development.Will appear on sun-exposed areas most commonly, followed by the trunk.Also develops at sight of previous trauma.Most rapidly grow and eventually regress.There are rare variants (2%) which are destructive.
19Keratoacanthoma Appearance & Natural History: Rapid growth phase: starts as a small domed-shape papule that may mimic molluscum contagiosum.Will progress in weeks to grow 1-2cm and often develop a central keratin-filled crater with crusting.Untreated, will stop growing in about 6 weeksStable phase: will remain unchanged for a variable length of time.Regression phase: will diminish in size, eventually disappearing, leaving behind a scar. Often regresses in 2 to 12 months.
20KeratoacanthomaCan be difficult to distinguish from squamous cell carcinoma (particularly nodular SCC).This lesion retains a smooth surface, unlike SCC.This can be treated medically or surgically, as it is a scarring lesion.Large KA on face may require Mohs’ surgery.Medical therapy options:5-FU creams (Efudex, Carac). Remove crust prior to application or pretreat with a 40% urea cream (Vanamide). Response in 1-6 wks.5-FU intralesional injection. Less efficacious on slow growing lesions.Intralesional methotrexate. Treat monthly.Imiquimod (Aldara) – QOD for weeks.
21KeratoacanthomaKeratoacanthoma: smooth, dome-shaped papules or nodules, often with acentral keratin plug.
22Dermatofibroma Common benign lesion. Most commonly occur on anterior surface of legs.Fibrous reaction to insect bite, truama, viral infection.Can be asymptomatic, painful, or slightly pruritic.Raised, pink or brown papule.Can be hard, scaly.“Dimpling test”Will retract beneath the skin surface when compressed.
23Sebaceous Hyperplasia Common small tumors of enlarged sebaceous glands.Start as pale, yellow papules on forehead, cheeks, nose.Develop telangectasias and central umbilication.Occur after age 30 in 25% of the population.May look like BCC. But lesions of SH are soft to palpation.Can express sebum.Treated with electrocautery.
24Actinic Keratosis Also called solar keratosis. Squamous cell carcinoma confined to the epidermis.Commonly thought of as a “pre-cancerous” lesion.Induced by sun-exposure, years of cumulative exposure are required.Lesions increase with age.Can spontaneously regress if sun-exposure is removed.Lesions have increased vascularity (erythematous).Develops adherent white or yellowish scale.Can bleed if picked.Many lesions are more readily identified by rough texture than appearance.
25Actinic KeratosisActinic Keratosis: classic appearance with scale and crust on anerythematous base (left). Many AKs on the face, the surroundingskin has irregular pigmentation and some dilated vessels (right).
26Actinic KeratosisActinic Keratosis: Larger lesions may have significant depth (left).Large lesions like this one may take years to develop (right).
27Actinic KeratosisCan progress to SCC: intra-epithelial lesion spreads to involve the papillary or reticular dermis.Risk of transformation is 0.085% per lesion per year.60% of SCC develop from actinic keratosis.AK can be difficult to distinguish from SCC, particularly thickened hypertrophic AK’s.Worrisome signs: induration, oozing, inflammation.Clinical variants:Cutaneous hornSpreading pigmented AK (can resemble SK or melanoma)Actinic chelitis (scaling, red lesion on lower lip with cracking or ulceration).
28Actinic KeratosisActinic Keratosis: thicker lesions can develop into squamous cellcarcinoma (left). AK’s can often clinically appear like SCC (right).
29Actinic Keratosis: Pigmented AK’s Pigmented Actinic Keratosis: Can resemble a scaling lentigo, aSK, or a melanoma in some cases.
30Actinic Keratosis Treatment: Regular use of sunscreen is essential. Cryosurgery is preferred since this method separates epidermis from the dermis. It may leave hypopigmented lesions.For many lesions, topical 5-FU therapy may be preferred.Incorporated into rapidly growing cells, causing cell death. Normal cells unaffected.Duration of therapy depends on location (2-8 weeks).Treatment causes marked inflammation in phases:Early inflammatory phase (erythema)Late inflammatory phase (burning, edema, stinging, oozing)Lesion disintegration phase (erosion, ulceration, eschar formation, re-epithelialization)
31Actinic Keratosis: Treatment Actinic Keratosis: Treatment with topical 5-FU follows a predictable clinical progression of inflammation of lesions. Right: 3 weeks after starting treatment.
32Basal Cell Carcinoma Most common type of skin cancer. Commonly presents as recurring bleeding or scabbing wound.Can occur at any age, but most common after age 40.Locally invasive, aggressive, and destructive.Limited capacity to metastasize.Often occurs in areas not sun-exposed (behind ears, medial canthus).Weaker causal relationship with UV exposure than SCC.85% located on head and neck, 25-30% on the nose alone.Tumor arises from basal keratinocytes and the surrounding adnexal structures (hair follicles, eccrine sweat ducts).
33Basal Cell Carcinoma Nodular BCC: Progression unpredictable: long periods of stability followed by rapid progression or regression.Clinical types: nodular, pigmented, sclerosing, superficial.Nodular BCC:Most common type of BCC.Pearly-white or pink, dome-shaped papule.They may be flat.Often has telangectasia.Center may ulcerate, bleed, and develop crust and scale (“rodent ulcer”).Any non-healing ulcer that fails to respond to treatment should be biopsied to rule out BCC.
34Basal Cell CarcinomaClassic appearance of nodular BCC: pink or pearly dome shaped papuleswith telangectasias.
35Basal Cell CarcinomaNodular BCC: “Rodent-Ulcer” with central scaling and crusting.
36Basal Cell Carcinoma Nodular BCC: small lesions can be easy To miss on physical exam.Nodular BCC: On leg. Consider whenA chronic ulcer fails to improve withtherapy.
37Basal Cell Carcinoma Pigmented BCC: Sclerosing (Morpheaform) BCC: Contains melanin.May resemble melanoma or seborrheic keratosis.Look for pearly-white, transluscent borders.Sclerosing (Morpheaform) BCC:Innocuous surface appearance which can mask deep and wide extension.Pale-white to yellow, waxy, firm, flat to slightly-raised.Can look like localized scleroderma.Borders are indistinct.Requires wide excision.
38Basal Cell CarcinomaPigmented BCC: Can have variable amounts of melanin. Look for elevated,Pearly-white borders.
40Basal Cell Carcinoma Superficial BCC: Least aggressive variety. Most often seen on trunk or extremeties.Can occur on the face.Well-circumscribed, oval to round, red and scaling plaque.Tend to bleed easily.May resemble eczema or psoriasis.Examine borders, which will be raised and pearly-white.Tension on surrounding skin may make border characteristics more obvious.
41Basal Cell CarcinomaSuperficial BCC: well circumscribed, with raised pearly-white borders, red,scaly, and sometimes resembling eczema.
44Squamous Cell Carcinoma Unlike BCC, these lesions have significant chance of metastasis.Risk Factors: childhood sun exposure, blistering sunburns, light skin, outdoor occupations, freckling, hazel/blue eyes.UV radiation is involved in the pathogenesis of SCC.Found in sun-exposed areas (scalp, back of hands, pinna).Actinic keratosis is most common precursor lesion.Capacity for metastasis related to lesion size and location.Thickness of lesion best predictor:One study found recurrent tumors always at least 4mm thick and all fatal tumors at least 10mm thick.Surgical margins 2-4mm depending on grade.
45Squamous Cell Carcinoma A nodular lesion that had been previously treated with cryotherapy.A red, keratotic papule withsurface scale. Resembles AK.
46Squamous Cell Carcinoma SCC on the lip of a patient who has spent years working outdoors.
48Malignant MelanomaMalignancy of melanocytes with high metastatic potential.Increasingly common: incidence in Caucasians has tripled in last 40 years.Lifetime risk in 1987 was 1 in By 2010 will be 1 in 50.Incidence in African Americans 1/20 that of Caucasians, in Hispanics, 1/6.Causes 75% of cancer deaths in the United States.Median age of diagnosis is 53.Significant association with UVA exposure ( nm).Risk highest to those that tan poorly and get intermittent sun exposure.Four major clinical subtypes: superficial spreading, lentigo maligna melanoma, nodular, acral-lentiginous melanoma.
49Malignant Melanoma: Risk Factors (Greatly Increased Risk)Risk Status:Relative Risk:History of atypical moles, family hx of MM, having more than moles35Previous Nonmelanoma skin cancer17Congenital Nevus (>20cm)5-15History of previous melanoma9-10Family hx of melanoma in first degree relative8Immunosuppression6-8
52Malignant Melanoma: Recognizing Suspicious Nevi The evolution of the benign mole (acquired nevi):Lentigo simplex (freckle)Pigmented junctional nevus (flat)Pigmented compound nevus (elevated)Flesh-colored intradermal nevus (more elevated)This occurs over decades
53Malignant Melanoma: Recognizing Suspicious Nevi The ABCD’s of moles:AsymmetryBordersScalloped edgesColorUneven pigmentationVarious shades brown, black, redDiameterGreater than 6mm
54Malignant Melanoma: Recognizing Suspicious Nevi Sign:Implication:Changes in ColorSudden darkening (brown or black)Increased number of tumor cells, with varying density (and thus pigmentation)Spread of color onto previously normal skinTumor cells migrating through epidermis (horizontal spread)Red colorVasodilation and inflammationWhite colorAreas of regression, inflammation (hypopigmentation) or even “halo” effectBlue colorPigment deep in the dermis, a sign of increasing depth of tumor
55Malignant Melanoma: Recognizing Suspicious Nevi Sign:Implication:Changes in BordersIrregular outline (scalloping)Malignant cells migrating horizontally at different ratesSatellite pigmentationMalignant cells migrating past borders of the primary tumorDevelopment of haloDestruction of the melanocytes by immunologic reaction and inflammationA halo nevus.
56Malignant Melanoma Superficial Spreading Melanoma (SSM) Comprises 70% of melanomas.More immature histologically than lentigo maligna.Rapid phases of radial growth and regression.Most common in 4th to 5th decade of life.Can occur anywhere on body.Most common on back of either sex or the legs of women.Known for random combinations of colors.Color becomes more varied as time progresses.Radial growth phase can last months to years.Nodules can appear as lesion get larger than 2.5cm
57Malignant Melanoma Superficial Spreading Melanoma (SSM) SSM: note irregular borders and varied color patterns. There arealso white areas of tumor regression.
58Malignant Melanoma Superficial Spreading Melanoma (SSM) SSM: Angular notching occurs as tumor regresses. These laterlesions show thickened areas that imply vertical growth phase.
59Malignant Melanoma Nodular Melanoma (NM) Comprises 15-20% of melanomas.Poorly-differentiated histologically. Does not respect histologic boundaries of skin.Male to female ratio 2:1.Most often dark brown, red-brown, red-black.Can be amelanotic (1.8-8% of NM).Dome-shaped, polypoid, or pedunculated.Most common on trunk and legs.Most commonly mis-diagnosed subtype (mistaken for hemangioma, dermatofibroma, dermal nevus).Often ulcerates and bleeds.
60Malignant Melanoma Nodular Melanoma (NM) NM: Thickened nature of lesions reveal its tendency for verticalgrowth. Color may vary.
61Malignant Melanoma Nodular Melanoma (NM) NM: Often ulcerate and bleed. Note the amelanotic (flesh-colored)lesion pictured to the right.
62Malignant Melanoma Lentigo Maligna Melanoma (LMM) Comprises 4-15% of melanomas.Presents in 6th to 7th decades of life.Radial growth phase called lentigo maligna (Hutchinson’s Freckle), which may last for years.Some LM never progress.Risk of progression related to age:For 45yo patient, lifetime risk of progression 4.7%.For 65yo patient, lifetime risk of progression 2.2%.Tend to have bizarre shape from years of growth and regression.Nodules do not develop until lesions as large as 5-7cm.
65Malignant Melanoma Acral Lentiginous Melanoma (ALM) Comprises 2-8% of melanomas for Caucasians, but 30-75% for Hispanics, African Americans, and Asians.Most often seen in males over age 60.Appears on palms of hands, soles of feet (most common), mucous membranes, or terminal phalanges.Grows slowly over years.Similar presentation to LM and LMM.These tend to be flat and are ignored by patients early on. Can be deeply invasive.Usually presents late when nodule forms. Poor prognosis.Hutchinson’s sign: pigmented band at proximal nail fold.
66Malignant Melanoma Acral Lentiginous Melanoma (ALM) ALM: Most commonly presents on sole of foot in non-whites.Looks like LM or LMM.
67Malignant Melanoma Acral Lentiginous Melanoma (ALM) ALM: Pigmented band starting at proximal nail fold is calledHutchinson’s sign. Can have peri-ungual spread (right).
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