Derm

Question 1

DDX for palisaded granulomatous dermatitis

Answer 1

1. granuloma annulare
2. necrobiosis lipoidica diabeticorum
3. rheumatoid nodule
4. epithelioid sarcoma

Question 2

Calciphylaxis

Answer 2

Renal failure, purpuric patches, calcification of vessels in subcutis with associated fat necrosis

Question 3

Psoriasiform dermatitis

Answer 3

• parakeratosis
• elongation of rete ridges
• thinning of dermal papillae (why they bleed clinically-Auspitz sign)
• often PMNs (Munro’s microabscesses)

Question 4

Infantile myofibroma

Answer 4

Nodule on lower extremity of baby, myxoid nodules with HPC-like areas