CD1+S100+ – Friday Pop Quiz 01/22
A 24 month-old infant presents with red-brown, crusted papules with petechiae in a seborrheic distribution. A biopsy is done to confirm a diagnosis. Which histologic picture is most likely?
A. CD1-, S100- cells with reniform nuclei
B. Foamy histiocytes with Touton giant cells
C. CD1+, S100+ cells with reniform nuclei
D. Mixed cellular infiltrate in a “ball and claw� …
A 24 month-old infant presents with red-brown, crusted papules with petechiae in a seborrheic distribution. A biopsy is done to confirm a diagnosis. Which histologic picture is most likely?
A. CD1-, S100- cells with reniform nuclei
B. Foamy histiocytes with Touton giant cells
C. CD1+, S100+ cells with reniform nuclei
D. Mixed cellular infiltrate in a “ball and claw� … 
For most dermatologic conditions, my mantra for treatment tends to be “less is more”. I prefer to use the fewest number of creams, pills, and steps to achieve the best results. However, after watching this year’s ODAC Sneak Peek Inflammatory Diseases Symposium, I may have a new mantra for treating my rosacea patients – “forks, spoons, and knives”.
At the ODAC 2021 Pre-Conference Sne … 
What is the diagnosis:
A. Alopecia areata
B. Trichotillomania
C. Androgenetic alopecia
D. Tinea capitis
E. Temporal triangular alopecia
To find out the correct answer and read the explanation, click here.
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At the ODAC 2021 Sneak Peek Symposium on Inflammatory Skin Diseases, expert faculty presented on the topics of acne, rosacea, atopic dermatitis, hidradenitis suppurativa, and psoriasis. If you missed the live symposium, Next Steps will be sharing highlights and a summary of each lecture over the course of the next few weeks. Today, Dr. Blari Allais shares an excellent recap of Dr. Joslyn Kirby's s … 
Histologically, this lesion shows plump, polygonal cells arranged in nests and fascicles with granular cytoplasm. Which immunohistochemical stain would be positive?
A. CD31
B. Synaptophysin
C. Factor XIIIa
D. S-100
E. CD34
To find out the correct answer and read the explanation, click here.
Brought to you by our brand partner Derm In-Review. A product of SanovaWorks.
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