DERM - Skin cancer Flashcards Preview

► Med Misc 43 > DERM - Skin cancer > Flashcards

Flashcards in DERM - Skin cancer Deck (27):
1

What are the worrying symptoms and signs of a potentially malignant lesion

Clues to melanoma:
• overall pattern recognition or the ‘ugly duckling’ sign rather than formal diagnostic criteria
•New lesion
•A history of CHANGE in a naevus is concerning

2

describe the epidemiology and anatomical distribution of NMSC and melanoma

Non-melanoma skin cancers (98%)
•BCC (67%), SCC (31%)
•Most common Cancer
•Common, usually not life threatening
•400 deaths per year (Mainly SCC)

Melanomas
(2%)
•Less common, more dangerous
•4th most common Cancer in Australia, highest rate
•Melanomas have the potential to spread internally to the lymph nodes and internal organs
•1500 deaths in Australia in 2011

The incidence of treated BCC and SCC is > 5x the combined incidence of all other cancers combined.

3

Where may SCC arise from?

a group of disorders characterised by keratinocyte dysplasia:
–Actinic keratosis
–SCC in situ (Bowen’s disease)
–SCC

4

What do melanomas arise from?

melanocytes

5

Describe SCC (Squamous cell carcinoma)
- appearance
- common sites

•SCC less common but more dangerous than basal cell carcinomas.
•Rapid rate of growth, over weeks or months, greater potential to metastasize to regional lymph nodes and distant sites –Urgent assessment required
•Usually present as a thickened scaly red patch or nodule, which may bleed easily or ulcerate and may be tender.

Common sites:
chronically sun-exposed sites; hands, forearms, head, ears, lower lip and neck.

6

Rx of SCC

Complete surgical excision with clear margins

High risk lesions may require additional adjunctive management eg radiotherapy
–Radiotherapy may be used alone if clinically warranted- eg elderly, surgical risks, size of defect

7

Describe BCC (basal cell carcinoma)
- characteristic of disease
- appearance
- common sites
- how Dx
- red flag

Common; 2/3 of all skin cancers in Oz. Locally invasive but very rare to metastasise. more indolent/slower growth than SCC

•PEARLY nodule with central ulceration measuring about 5mm in diameter
•Telangiectasia across the lesion

- chronically exposed to the sun; head and neck > trunk > limbs.

Confirm the diagnosis with a biopsy

Red Flag: Bleeding is an important clue for the diagnosis of BCC

8

What can nodular BCC mimic?

Melanoma if pigmented

9

Describe superficial BCC (SBCC)
- appearance
- red flag

Superficially invasive

- Presents as slowly enlarging plaque
- May develop superficial erosion
- Red Flag: Beware the solitary red plaque not responding to topical treatment

10

Rx of BCC

•Nodular or Infiltrating: Surgical excision with clear margins

Superficial BCCs
•Surgical excision
•Serial Curettage
•Topical Imiquimod
•Photodynamic Therapy (PDT)

11

Describe actinic keratoses (solar keratoses)
- characteristic of disease
- appearance
- common sites
- Red flag

Very common w/ age. Can progress to invasive SCC but rare.

•Erythematous scaly lesions on dorsum of hands
•Not indurated nor tender

Sites: Sun exposed skin on the face, scalp, forearms and dorsum of hands

Red Flag: Beware of the growing hyperkeratotic and tender nodule amongst the AKs – this could be a sign of malignant transformation into SCC

12

Rx of actinic keratoses

–Cryotherapy
–Topical: 5-FU, Imiquimod, Ingenol mebutate, diclofenac in hyaluronic acid, PDT

–Surgical excision for lesions which are
•resistant to treatment or
•suspicious for SCC

13

Describe Bowen's disease (in situ SCC)
- characteristic of disease
- appearance
- common sites

A type of keratinocyte dysplasia.
•It is a SCC in situ, where full thickness epidermal dysplasia is seen, but it is non invasive
•The risk of malignant transformation into SCC is estimated at 3-5%.
•These lesions are often asymptomatic, but can be itchy, painful or may bleed.

Common sites: sun exposed areas, esp lower limbs.

14

Rx of Bowen's disease

–Topical
•5-FU, Imiquimod, PDT

–Surgical excision for lesions which are
•resistant to treatment or
•suspicious for SCC
•certain high risk patient groups

15

Examples of pigmented lesions

•Lesions of melanocytes
–Benign naevi
–Malignant melanoma

•Also, some lesions which look pigmented, but are not melanocytic in origin
–Eg pigmented BCC, pigmented actinic keratosis, seborrhoeic keratoses, solar lentigines- due to melanin or keratin

16

Describe characteristics of benign moles

•Tend to be small
•Evenly coloured
•Regular edges
•1 colour
•Symmetrical
•Does not “stand out”
•Does not change with time

17

Describe pigmented solar keratoses

•Middle-aged people
•Sun-induced
•Usually scaly and erythematous, but can be pigmented
•Rough surface

18

Describe characteristics of dysplastic naevi
- size
- colours
- borders
- what is it an independent risk factor for?

•Naevi which show atypical features both clinically and histologically but are not malignant melanoma
•Larger (>5mm)
•Atypical pigment net on dermoscopy
•2 or more colours
•Smudgy borders
•Generally still symmetrical

Independent risk factor for development of melanoma, especially if several

There is no place for the prophylactic excision of dysplastic naevi but if melanoma suspected, it should be excised urgently

19

What are (11) risk factors for melanoma?

–Multiple dysplastic naevi (more than 5)
–Multiple (>100) typical naevi
–Past history of melanoma
–Strong family history (1 or more first degree family members)
–History of blistering sunburns (esp. childhood)
–Previous non-melanoma skin cancer
–Type 1 skin (burns easily with no tanning)
–Freckling
–Blue eyes
–Red hair
–Immunosuppression

20

Common sites of melanoma distribution in women & men

Women: legs
Men: trunk, head & neck

21

Px of melanoma

A - Asymmetry
B - Border irregularity
C - Colour variegation
D - Diameter (>5 mm)
E - Evolution (any changing lesion)

N.B: some subtypes of melanoma do not fulfil these criteria & Many benign lesions may satisfy all the ABCDE criteria (e.g. seborrhoeic keratoses or dysplastic naevi)

22

What are (4) melanoma subtypes?

•Superficial spreading melanoma (SSM): 80% of melanomas. Usually follow the ABCDE rules. Evolves over weeks to months
•Lentigo maligna: very slow evolution.
•Acral lentiginous melanoma
•Nodular melanoma: often do not fulfil ABCDE criteria. Rapid growth & early invasion. Common in older males (less doctor visit). Follow an EFG rule

23

How do nodular melanomas present?

EFG (rather than ABCDE)
•Elevated
•Firm
•Growing

If in doubt, excise completely and urgently

24

Describe (2) biopsy techniques in skin cancer
- what are they recommended for

1. Partial biopsies (not recommended for pigmented lesions – sampling error)
•Punch biopsy (2-3mm biopsy punch into lesion)
•Shave biopsy (shave across lesion into dermis. Not good for assessing depth of lesion)

2. Excisional biopsies (best for pigmented lesions)

Punch biopsy & shave biopsy are appropriate Ix to confirm the diagnosis of NMSC but be aware of limitations

25

What determines the excision margins for melanoma?

Breslow thickness

E.g.
- in situ thckness -> 5mm margin
- 1cm margin etc

26

Prognosis of melanoma

Survival depends on the depth

- In situ: 100%
- 4mm: 45-67%

Other factors determining prognosis:
–Ulceration, mitotic rate
–Age, sex, other patient factors
–Location

27

Advise on sunprotection

1. SLIP on a shirt
2. SLOP on some sunscreen
3. SLAP on a hat
4. SEEK shade
5. SLIDE on some sunglasses…

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