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  #1  
Old 10-28-2012
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Arrow Billy Step 1 Questions # 47

A 30-year-old man with a history of Crohn disease has noted the appearance of a painful red nodule on his left lower
leg during the past week. On physical examination, his temperature is 37.3°C. There is a 0.4-cm, dark red nodule that is
very tender to palpation and has a surrounding 5-cm diameter area of paler red skin. Over the next 3 weeks, this lesion
resolves, but another develops on the opposite calf. A skin biopsy of the second lesion is done, and microscopic
examination shows a dermal mixed inflammatory infiltrate with neutrophils, round cells, and giant cells with pronounced
edema. These lesions resolve without scarring, but more lesions develop during the next year. What is the most likely
diagnosis?


□ (A) Acne vulgaris
□ (B) Dysplastic nevus
□ (C) Erythema nodosum
□ (D) Impetigo
□ (E) Keratoacanthoma
□ (F) Molluscum contagiosum
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  #2  
Old 10-28-2012
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I will go with C) Erythema nodosum
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Old 10-28-2012
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C) erythema nodosum..

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  #4  
Old 10-28-2012
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Default my answer :)

(C) Erythema nodosum
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Old 10-28-2012
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(C) Erythema nodosum
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  #6  
Old 10-28-2012
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□ (C) Erythema nodosum
??/
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One day i will infect these microbes and they will search for "Anti-MEbiotic"....
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  #7  
Old 10-28-2012
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Correct Answer C is correct

Erythema nodosum is a form of panniculitis that can be associated with infections, drug ingestion, inflammatory
bowel disease, and malignancies, but an underlying condition is not always found. The inflammation primarily involves
dermal adipose tissue. Acne vulgaris is most likely to appear on the face and upper trunk centered around hair follicles; it
often resolves with scarring. Dysplastic nevi have atypical keratinocytes without panniculitis. Impetigo is seen on the face
and hands with crusting lesions from Staphylococcus aureus and β-hemolytic streptococcal infections producing
subcorneal pustules. A keratoacanthoma is a rapidly growing ulcerative nodule that typically regresses in several months;
it resembles squamous cell carcinoma. Melanomas have very atypical spindle to epithelioid cells that invade the dermis;
they tend to change in appearance over weeks to months, not years. The lesions of molluscum contagiosum are firm
nodules that microscopically contain pink cytoplasmic inclusions, called “molluscum bodies.”
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The above post was thanked by:
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