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NBME 21 Answers

nbme21/Block 4/Question#9 (39.7 difficulty score)
A 60-year-old woman with psoriasis comes to ...
Porphyria cutanea tardaπŸ”
tags: porphyria phototherapy 

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 +8 
submitted by imaginarybanana(29),
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tihw CPT uyo era posdusep to voaid xsseveice siguthnl and UV xpuer.eso lhentMsoeax kemas ryuo ikns mreo elusiebpcst to UV hgl.ti

notadoctor  Wouldn't UV light also be contraindicated in Vitiligo? +5  
sweetmed  Phototherapy with photochemotherapy (PUVA) is a well-known and well-studied modality for the treatment of psoriasis, which involves systemic or topical administration of chemicals known as psoralens and administration of ultraviolet light in increasing dosages after requisite time gap. PUVA is also used in the treatment of widespread vitiligo with moderately good results, though it is being surpassed by ultraviolet B (UVB), which is equally or slightly more efficacious with fewer side effects. +8  
dashou19  Honestly, I didn't even know what Methoxsalen is, just chose the right answer because I know you can not give UV light to people with PCT... +11  
sarahs  what about tcell lymphoma which also has cutaneous lesions? +  



 +4 
submitted by sweetmed(143),
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58on0i2tph2mhvg5wt/pi.bcwwn3b5e/.smlnu../:/d

PVAU si duse to etatr sosiarPis adn itgiiloV

minion7  puva also used in GVHD +  



 +0 
submitted by castlblack(53),

https://academic.oup.com/qjmed/article/107/11/945/2890493 PCT = vampires!

similar or same disease = Gunther's disease NSFL https://www.google.com/search?q=gunther+disease