Chapter 25: Skin

Chapter 25: Skin

Complete Chapter Questions With Answers

Sample Questions Are Posted Below

MULTIPLE CHOICE

1. Which of the following skin lesions becomes darker and more pigmented upon exposure to sunlight?
2. Vitiligo
3. Lentigo
4. Ephelis
5. Congenital melanocytic nevus
6. Dysplastic nevus

ANS: C, Ephelis (freckle) becomes more pigmented upon exposure to sunshine. Freckles differ from nevi (moles) and lentigines, which do not respond to ultraviolet light stimulation. Vitiligo is a depigmentation of the skin that does not respond to sunlight.

2. A well-demarcated, coin-like, dark brown lesion appeared on the shoulder of a 59-year-old man. The lesion appears velvety, greasy, and has a “stuck on” appearance so that it can easily be removed. Which of the following is the most likely diagnosis?

1. Lentigo
2. Ephelis
3. Vitiligo
4. Seborrheic keratosis
5. Actinic keratosis

ANS: D, This well-demarcated, “stuck on” pigmented lesion, which appears greasy and velvety on palpation, most likely represents seborrheic keratosis. Such benign epithelial tumors are extremely common in middle-aged and elderly persons.

3. Which of the following skin lesions will most likely progress to invasive squamous cell carcinoma?
4. Actinic keratosis
5. Seborrheic keratosis
6. Seborrheic dermatitis
7. Epidermal inclusion cyst
8. Steatocystoma multiplex

ANS: A, Actinic keratosis is an intraepithelial malignancy that can progress to invasive squamous cell carcinoma; it is therefore advisable to remove these lesions before they transform into squamous cell carcinoma.