Reactive Dermal Infiltrates – Friday Pop Quiz 01/29
A pregnant 33-year-old female presents with the shown painful lesions that appeared abruptly one week ago. She additionally has been febrile to 38.3C with malaise and headaches. What do you expect to find on biopsy of a representative lesion?
A. Perivascular neutrophils with fibrinoid necrosis and RBC extravasation
B. Apoptotic individual keratinocytes with intracellular spongiosis
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A pregnant 33-year-old female presents with the shown painful lesions that appeared abruptly one week ago. She additionally has been febrile to 38.3C with malaise and headaches. What do you expect to find on biopsy of a representative lesion?
A. Perivascular neutrophils with fibrinoid necrosis and RBC extravasation
B. Apoptotic individual keratinocytes with intracellular spongiosis
… Continue reading "Reactive Dermal Infiltrates – Friday Pop Quiz 01/29"
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.
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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.
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The pathology of this lesion demonstrates reticulate strands of the epidermis with clefting between the strands and the stroma. What is the diagnosis?
A. Eccrine syringofibroadenoma
B. Fibroepithelioma of Pinkus
C. Squamous cell carcinoma
D. Reticulate seborrheic keratosis
E. Tumor of the follicular infundibulim
To find out the correct answer and read the explanation, click her … 