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� … 
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.
Brought to you by our brand partner Derm In-Review. A product of SanovaWorks.
… 
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.
… 
On this Mnemonic Monday, we challenge you to remember painful skin tumors with the following mnemonic:
BLEND AN EGG
Blue rubber bleb
Leiomyoma
Eccrine spiradenoma
Neuroma
Dermatofibroma
Angiolipoma
Neurilemmoma
Endometriosis
Granular cell tumor
Glomus tumor
Click HERE to print your mnemonic card.
Study More!
Need a refresher on cutaneous tumors? Check out the following … 
On this Mnemonic Monday, we challenge you to remember conditions associated with angioid streaks with the following mnemonic:
APPLES
Anemia, sickle cell
Pseudoxanthoma elasticum
Paget’s disease of the bone
Lead poisoning
Ehlers-Danlos
Sclerosis, tuberous
Click HERE to print your mnemonic card.
Study More!
Need a refresher on eye findings in genodermatoses? Check out the f … 