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Retired 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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eorsrioPt rcod rsednmyo ruocsc ude ot tcifnnoira of eth etriropso lhaf fo the lpsina r,cdo ormf lcosoicun of eth tsoeirrpo lspani e.ayrtr Oru teaptin sneestrp htwi areeseddc nsinaoets ot iripkpnc lowbe hte lelve of teh nekse sa llwe sa iwalgkn tihw a ds-wbedaei i,tag eykill iigitancnd osls of .orcenpitoorpip Teh pttenai si sloa cinaem whit reseyeeg-mnphdt uso.hietrpln

sdyHegtpeenmer esrhulpnito era clialtypy csduae yb an ianilitby to mkea ohegnu ,DNA audcse yb a ackl fo caesenyrs osscuerprr dan iniastvm ugilcndni 9B (ea)tfol dna 21B olc.bam()ani fI het ntpaeit is flteoa ,ftndiicee ew see edteveal yoichtensemo fecidiec.ny If eth attinep si 21B ciet,enfid we see daeevelt anyeltomchilm daic and eeyncotimohs sveel.l cneyeepimtrsmoyHaioh nac nearesic mb.troshsio rsTiohsomb in eht ptoorrsei lpansi yraetr nac cusae oprseitor ordc ns.ermody In ,idinoatd clak fo avmniti B12 sriampi ilymen otamniofr adn ladse to teuScaub edoCmibn iegotenr,enaD iwchh efscfta eth amoaShilptcni tactr acogc(nuitn fro deescdear icprnkip o,esninas)t siplicooatCnr r,atTc nda Dlrosa dM-melCnlauio sisLenucm rtTca ginccatu(on for teh erducde pnioooprrtei.cp

A) Aetinorr rcdo snomdyre- lsso of otomr cmdn,amo sa ewll as itarelbla ossl of thea dan i,npa teh tpiante has ont lost romot oftnu,nic os it nnatco eb tsih. )B neCltar rodc noesd-yrm esrpsent sa a ninacitbomo of trmoo nad ssoryen ols,s lulyusa wtih dbadrel snctodiu.nyf iThs ptntiae oesd nto yldipas morot sslo ro erdlbda yufcsdntino. )C dimHcore y-mdrnsoe oAls cdllea Saonqedu,B-rrw tshi is emoceptl uryinj ot ithree teh letf or grhit seid of het lipasn .rodc It sptseern ithw ortom nofyscntuid nda eflxre itcuysonfnd itlalspeaylri ta eht lelve fo the ;esoiln lsso fo ruppe tomro amdmnoc wobel het eosnli laylislterpia stspc(ia spsa);eir sosl of sdolar r-uaomcnriecld otnnsesia liysilaarplte ta nad weobl eht soenl;i adn ossl fo nipa dan erteaepmutr aoseinstn elaarryactnllot 2 ot 3 rvbetaer bwoel hte oenlsi. )E nSymeegatr yesdornm- a egaioncntl ufleiar ot pedevol tapr of eth sainlp .codr hTe wne noets of ssymmpot at 82 eayrs ldo akmse tish an knllieyu goaniis,.ds

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yb_26  mzgaia,n ahknt !uyo +
aisel1787  egrta tnnxploiaae +
rockodude  ienosnsta ot ciikppnr is MCDL acttr. DCS tfcfeas elesnbprrieoalc (tno amilc,t)saponih iltsico,crnpoa and DMLC. rthosieew ogod aannoeix.ptl +4
azibird  noesaiStn to ncpripik si not soradl nc-doalmlmieu lalmnceis ttar,c ist' iaopschtaimnl tarc.t oS stih tanteip has a liones of het aldros lo,nusmc ohlimiaatsncp trcat mpnrehtseedgye hlsor,uipnte adn maan.ie hWta hte ellh is ggoin on? oHw si hsti jtsu reortiosp rcdo nrdymeo?s haSnoitplmcai si ont iorseptor do.rc +5
makingstrides  ekiL mots fo heste qusenti,os kpci hte tslcso/e tesb ensawr. rFo snoeras abevo, hsit is eht stbe n.oe +
skonys  F1A9 9gp6 yssa 2B1 iyciecfned ssceau SDC NDA h.asspresiata sTih ptaenit hsa ovgeirpsesr musncddeeeaesn/brs ,pnpkicir xiataa enbrp(aeosicrlel ;pm&a DM)LC. solA 'tsi tnmptrioa to mremreeb htat B9 dna B21 tohb eahv slaabctigmelo aeniam ubt B9 'SOTEDN veah grelolocnuia s.mmyptso +1



 +2  upvote downvote
submitted by โˆ—seagull(1933)
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B12 cfndcieiye asedl to edmaitynnilo fo eht CLDM and LSA wsathayp (ie.. etorsipor rocd .sn)modyre

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 +1  upvote downvote
submitted by โˆ—amarousis(27)
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tuB n'soetd cateuusb cdboeimn nnreeeiadotg aedl ot ptnraimeim ni ,DMLC aercbrlenpisoel adn otsprclciinao attc?r I gte hte tiaaxc taig - aeeCelM/Lcpbiol.nsDrr tBu the oasnestni ot inp,rkicp 'nuodwlt ttah eb het iihoapnmcstla cttr?a taTh si not llusayu dffeteac in beuuacst endiocbm iteoeg.enndar

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krewfoo99  tI wduol acffet teh osradl onmluc ttcra dan eth lmctnosipaiah ctr.ta It tonw fectaf the pieanblrlcrsoee cratt hs(Tu Rmseobrg igsn ni 1B2 ycediifnce lilw eb l itAliesp)ov etreh of teh atcrts ear tfcedfae ni eicrhFdsir xAaita +
krewfoo99  rr.Soy tJus keecchd no .FA tI wlil saol effcta eht ebeasrlnpoilrec attrc +
spow  tseonnSia to cnprpkii si MCDL +
meli  WDRLOU :D5I6 mn"ya attspnie odelevp necougroli naotssifmtinea ued ot: loaanx enirnotgaeed fo eht preprleiha en,esvr daigeln ot ,nsubesmn rteas,pehias nda eeddsepsr ormot xfe"erl.es o,S I hinkt het nisetason to pickpinr was ecsdginbri the saaietrhspe! +



 +0  upvote downvote
submitted by โˆ—masonkingcobra(408)
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yeolraslnP ym uesis ihtw ihts iunoesqt is thta I hthugo B21 uassce aiyneidtneolm in htbo hte TLSC dan eth MCLD (SDC) ubt ethy are itngste teh saihmmecn hree yellra tihw hte ohlew leoycanmtmih acdi bit nad eht miiaedrp elnymi hisssnyte

If or'uye oscuriu

i6dpr//c/cctutta/n.6ceh:.n21twarwmoewaslsss0

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 +0  upvote downvote
submitted by โˆ—krewfoo99(115)
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Cna moeesno apxlnie thaw het irucpte si ospepdsu to ?wsho sI ti edpspous to eb egentesmd eol?hnisuptr

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titanesxvi  esy do to 21B niiefeydcc +



 +0  upvote downvote
submitted by โˆ—titanesxvi(106)
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eHre si a dogo cuersero

gadnpdoocItsewwbe/osmss_ml_rtr.olumhwwe/ecs/otympnsk.cn:naeoi_/dpls/

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 -1  upvote downvote
submitted by โˆ—cheeseheadkids(22)
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I asyrlenlop flee isth qtoueins is dsgalmneii beaecsu eth sslo fo kpiipncr msetsndotrae lsso fo the imlocnahsitpa ttcar. iTsh si NOT arpt of uubeacts biondmce inoegteenrda deu to B12 ceydni.ecfi

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