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NBME 21 Answers

nbme21/Block 3/Question#27 (reveal difficulty score)
A 55-year-old woman with a benign nodule in ...
External carotid πŸ” / πŸ“Ί / 🌳

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submitted by βˆ—haliburton(222),
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oflmirucrausb dislapsya ni hte tfel nlera a. seacus wol olfw geisnulrt in lwo .RGF hciroCn low GFR escsua rtauubl optyh.ra xert(pce dna efrceneer lewo)b.

ubulTar ohaprty si a lnargee tmer hatt sdrbeesic lsverea psnrtaet fo rcnoihc lratubu ruynji hwit enkidhcet utablru bensaemt en,mbsmaer nda liccnlaily nmafisste as ocricnh iydenk ssadiee wthi esdercdea auormgllre aitiflonrt ret.a nerscIaed etetxn fo rutualb ropahyt adn naomaipcgync tateiinltrsi siofbrsi actsroleer ithw ewros sigrpn.soo ioreunPtair si rvlaeia,b ndgnpeeid no .cesau


submitted by βˆ—hayayah(1145),
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The doriyht si ppdeiuls hwti elaiartr lbodo ormf het rpuroise itdhory reart,y a cbanhr fo hte axteenlr itoadcr yrtrae, nad hte rfiroein hoidtyr ,tayrre a abhrnc of teh ytilcorevrcha .krntu

sahusema +6  

submitted by sharpscontainer(16),
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I swa ;dpedu did yanobdy erhe teg it gwron aecsueb hyet thuthgo abuot hte rdoithy iam erytra nagsrii mfor eth cclaebipichharo sNJ uttn?orku? O? .akemy

peridot  Ooh that is tricky tricky. In the question stem they said they already ligated that one ("a branch of the brachiocephalic trunk") and were wondering what else needs to be ligated in addition to that. Therefore the answer is the superior thyroid artery, which is coming from the external carotid. I don't think I knew any of this when I did the question though, cause I had to google all this just now. +1  
anechakfspb  In the stem they said they ligated a branch of the thyrocervical trunk, not the brachiocephalic. According to Wiki, the thyroid ima artery (which does arise from the brachiocephalic trunk) is only present in about 3-10% of the population. Therefore, while technically this answer could be correct, external carotid is "more correct". Source: +1  

submitted by βˆ—schep(36),
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A freeehsrr no hte abrencsh of lrnetaex atcrido Peaxy-LtraMASSOFr

rreuoipS idotr,hy igenndscA nrypae,hlag ,giuaLln l,aFcai ctp,Oilcai oseritroP caruralu,i alxMraily and eariuplciSf topmlaer

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