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NBME 23 Answers

nbme23/Block 1/Question#28 (reveal difficulty score)
An otherwise healthy 82-year-old man is ...
Posterior cord syndrome ๐Ÿ” / ๐Ÿ“บ / ๐ŸŒณ / ๐Ÿ“–
tags: neuro b12 vitamins

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 +27  upvote downvote
submitted by โˆ—sajaqua1(607)
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iorseProt codr nymroesd crocsu ude to aiionfrtnc fo eth errptisoo hafl fo the lipsan ro,cd rmof ioonccusl of eht rrtesoiop lnipsa rtyear. rOu tntiaep sseprnte ihtw ercddaees ieonssnta ot icrpkpni woebl eth levle fo het sneke sa ellw as aniwlgk twhi a swededbai- g,tia lkelyi nniigdtcia loss fo roe.ocirpptoipn hTe intepta is olsa naicme wtih sregenedptmhy-e liuost.penhr

rsemeeHgpyetdn opslteuirhn ear ylypitcal esduac yb na iiiyaltbn ot emka gunoeh ADN, acdues yb a aclk fo nescsayer spurrrceso and itvsmina indgnucil B9 faelto() nda B12 ao)n.lmicab( fI het epatint si oeltaf f,cidentei ew ese edvteela otsyhnmoceie y.nedficeci fI het iatentp si B21 f,cdneitei ew see tleedaev oenhmyciatlml dcia dan onicsheeyomt lsveel. eemposmceanHyyiirtoh can eeisnacr br.mtosohsi osmhiorTbs in het roepsoirt silpan yaertr nca euasc rrootsiep docr medny.sro In ditano,di ckla fo tnmiavi B21 rsimapi nmyeli amnfooitr dan sdlae ot utbuSeca mnCodibe ertonegenia,D whhic ceffsat het lopnacamhitSi tcart atguicno(nc rof aedecsrde ppnkciir ,i)ossaentn Ccatrslinpooi t,rTac and aorlsD aiden-mulloCM smcnLeuis rtcaT atnnougcic( for hte rdceued cpprit.ooronpei

)A trireAno odrc noryemd-s osls of omrto mn,ocadm sa lewl sa itaaelbrl loss fo teha adn a,ipn eth eiatntp ash ont tlso morot fit,unnoc os it tanocn eb t.shi )B rCtlena ocdr edorsynm- stenrpse as a imacotonnib fo tormo nad ssornye ,lsso yalsluu ihtw dardelb tnsoyfudn.ci shTi eatntip dseo ont pladsyi moort slos or learbdd fycsdtnunio. C) remHdcoi -dnormyse Also eadlcl nrBdo-,euSqrwa tish si lemctope yjirnu ot eireht eth left ro trgih iesd fo teh aisnlp o.drc It spseenrt hwit rtomo nfcntuydois adn erexfl iotsfncdynu aryteliasllpi ta eht eellv fo the ;slineo slso of uperp ormot coammdn owbel eth olsnie rplatealilsyi aits(cps aep)sir;s slso fo loasdr ra-ocdlrceuimn iosnetnsa esprililtlaya at dna lwoeb eth lneoi;s and ssol fo pina dan mptrrteueae nniosetas erylnlcatltoara 2 to 3 bevraetr webol eth oesn.li )E gnyeSrteam rnsy-eomd a neaoctglni lruifea ot epolvde rtap fo the alnips d.roc Teh nwe tesno of mmpotsys at 28 eyras dlo saemk tihs an lulynike .aindgs,ois

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yb_26  i,zganam nkaht ouy! +
aisel1787  ratge xeoiantpanl +
rockodude  isoatnnes ot kpciipnr is CDLM ctrat. SCD eacftfs ilsberornlcpaee tno( icaoalsp),hnimt alpri,oconcist dan CD.LM hsrteiowe dogo aotelixn.pan +4
azibird  nsitenSoa ot nricippk si tno sdorla oianedcm-mllu iasmnlecl ttar,c is't nlpthiasomcia acttr. oS shit antipet has a eonsil of het lsdoar nclsu,om alaimhontcips rtatc megsdeypehtenr tlueinoprhs, nad iamean. hWat hte llhe is ngogi no? oHw is tish sjtu itrrsooep odcr ?onsdeyrm aimSlthopnaic is nto perooitsr odc.r +5
makingstrides  eLik smto of tehes eqtunsos,i kcpi hte octles/s ebst sr.wena orF erasnso bvoea, hsit is teh tseb .neo +
skonys  91AF pg96 says 21B ndciiceyfe ecssau CSD AND staeai.shsrap sTih tnietap sah rrvgeeopssi urnee/ecasmsesdnbd ,rpnikicp taaaxi abeloperl(nrisec apm&; .LCDM) Alos i'st totnipamr to bmrreeem htat 9B nda 2B1 hobt vahe begiactalsmol anaiem btu 9B SO'ENDT aveh elrauigcolno tmy.ssmop +1



 +2  upvote downvote
submitted by โˆ—seagull(1933)
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B12 idcicnyefe slaed to mtnnaielioyd of the LDCM nad LSA ayhawstp (.ie. trisoorep cdor ).edymsrno

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 +1  upvote downvote
submitted by โˆ—amarousis(27)
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uBt dost'ne bacsuuet oiemndcb tareegnideon adle ot niermmitpa in ,LMCD arplceensoebrli and olicosnirtcpa rtta?c I egt eth atcaxi gtia - eLeDbircse/rlpl.aCnMo Btu teh nosasient to ,rppkncii 'oudnwtl atht eb eth pcmlotahansii ?ttacr That si tno lulayus adfteecf in sbtecuau nbiedmoc neda.enritego

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krewfoo99  It lwduo tcaffe eht olrdas loncmu tcrta dan the hnilopistcama ct.rta tI tnow feftac eht roeanlpbcieesrl ractt h(usT erbgsmRo gisn in 1B2 efdecyicin illw eb Apvlslitio)e reeth fo het tastrc aer efeftadc ni crredFhisi axiAta +
krewfoo99  oyrrS. usJt hccdkee on AF. It illw also ceffat teh lecrpebaenoisrl ctatr +
spow  nSneaotis to pipicrnk si LCMD +
meli  LUWDOR D:I65 nm"ay satptein elodpev glerunooci atsfnmtaoeisin eud o:t anxoal riteenaonegd of teh liraepephr vens,re dgnaeil ot nubne,mss reaes,siphta nda pesderesd omtor fe"eslex.r S,o I itnkh eht tansonesi ot nkricppi swa ncsbirgide eht r!pahaiteess +



 +0  upvote downvote
submitted by โˆ—masonkingcobra(408)
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alnelyorsP ym isseu htwi htsi nstuioqe si htta I guothh 21B scaues mtedeynniloai in obth eht CSLT nda eht MDLC C(DS) ubt yeth ear tgtensi the csemaihnm eehr aerlyl whit teh ehlwo ymhlcietnmao adic tbi nad eht iimedapr lnyemi tssnhieys

fI uoyre' ucuiors

otcesacu/2rsiarhac0ps/n16wm:des6n/cwt./t.wtl

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 +0  upvote downvote
submitted by โˆ—krewfoo99(115)
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anC eosoemn pnxlaie waht teh eucprti si psuodsep ot wsoh? Is it epdspsuo ot be esendgtme tshuep?ornli

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titanesxvi  esy od to 1B2 inifdyceec +



 +0  upvote downvote
submitted by โˆ—titanesxvi(106)
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Hree si a godo uoerrcse

tnwnmw.lsade:eceswmnm_clyoromio/k/ptch.wtIss/uoerg_oasodsn/_pbe/lpsd

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 -1  upvote downvote
submitted by โˆ—cheeseheadkids(22)
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I posenryall efel isth siqenuto is maigsidlen auecseb teh slso fo cirpnipk stsrnmaetdoe sosl of eht haasnltipcoim t.atrc This is OTN atpr of utcesbau nmedbioc ntgoeiedraen ude ot 12B .icdicneyef

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