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NBME 24 Answers

nbme24/Block 4/Question#17 (51.7 difficulty score)
A 63-year-old woman undergoes operative ...
Decreased movement through the arachnoid villiπŸ”

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submitted by happysingh(45),
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,so eht yeK ordsw tath no eon is oniengimnt : citmgoucaminn hsehdlcaourpy

the haypospht eosg ilek siht :

an mlmyoniaarft tstgien ,i(e.. drsaohiaubnc aegrro)hmeh eildy rbosfiis / arcrisgn of eth diachonar ntuorinalasg =tg;& erpdiiam CFS rnegadai

teh yek sontip / nteocscp they are riygtn to sett ehre : 1. od oyu wkno hawt iotncuicnammg elhcaphrydous htit(wou hetm tlnglie yuo oshet drs)ow 2. do yuo wonk w'hsat teh yogpoliahypohst o(f cuaimnnctgomi hpceushr)doyal is ?

potentialdoctor1  Exactly. To add to this, communicating hydrocephalus can be subdivided as follows: Normal-pressure hydrocephalus: Chronic/gradual decrease in CSF reabsorption at arachnoid granulations, usually due to calcification due to aging. CSF accumulates slowly, so ventricles are able to widen without causing an important increase in intracranial pressure. Symptoms occur due to compression of periventricular white matter tracts ---> Wacky, wobbly, wet High-pressure hydrocephalus: Acute decrease in CSF reabsorption at arachnoid granulations, usually due to inflammatory state in the subarachnoid space (eg, meningitis, sub-arachnoid hemorrhage). CSF accumulates suddenly, causing an acute-onset increase in intracranial pressure +7  
sunshinesweetheart  not to take away from your perfect explanations, but if it were a woman with neck stiffness and fever (rather than circle of willis rupture) that could lead to increased CSF production, right? I think that's the only case where CSF production would increase. Also I think decr absorption in arachnoid granulations in that situation as well so it'd be a shit question +  
peqmd  If anyone like me also got "decreased absorption in choroid plexus", as their wrong answer it's because the choroid plexus doesn't "absorb" it produces. +9  
alienfever  FA 19 p510 +2  
alienfever  If anyone chose F, communication hydrocephalus is caused by decreased absorption and not increased production. FA 19 p510. +1  
an_improved_me  So she has a leaking aneurysm for how long.. gets it repaired, and then within 2 days has an inflammatory response that leads to decreased CSF absorption at arachnoid granulation... Is it the bleeding associated with the aneurysm causing it? The surgery? I'm inclined to say the latter, given that it happens coincidently after the surgery, and not for however long it was leaking beforehand. Thats what tripping me up. +  

submitted by colonelred_(105),
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layrloNm teh onrahaicd lvili rndais teh SCF mfro hte ahniouarsdcb eascp ot eht uonsev ;msytes fi itsh artp esobecm eidfcvtee hnet uyo cna iemiang all htat SCF now bliungdi up in teh unaicadbsroh

keycompany  Also take into account this patient had surgery that requires penetration into the subarachnoid space (hence through the arachnoid mater). This can lead to scarring of the arachnoid granulations and subsequent communicating hydrocephalus. +16  

submitted by roygbiv(20),
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heT ntiatep sah a leingka ybrre yasnrmeu -t;-g& isht seald to a borinuadhcas rhoahegemr r(o leeakga ntoi csaronihbuad pceas) g-;-t& ceuta HAS cna edal to esdraecde bsnoriotap dna nvmmetoe iva oaahidcnr villi

zbird  So this patient has a leaking berry aneurysm which undergone to surgery and repaired but in two days she developed widening of the SA space which could be explained by increased CSF production but a decreased in absorption, which is due to blockage of the arachinoid granulations by the leaked red and white cells therefore there is a decreased movement of the CSF via the arachinoid villi +1  

submitted by krewfoo99(93),
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yhW douwl ddrcaeese vetemmno gurhtoh eht larereecb dtauquac eb wonr?g Wthi lla eth lidbu of loodb ni eth SCF crtta tiwouht sbnp,ratioo woludtn mteevnom aols eb earesdcde htrhgou hte auctuedq?

ergogenic22  this would cause a non-communicating hydrocephalus with enlarging of the lateral and 3rd ventricles but normal 4th ventricle and subarachnoid space +1  

submitted by diabetes(28),
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iplsmy eth ldoob ndisei eth FSC emboec edbclok hugtorh rdanociha iontraalsgnu =t=&;g deaerces trobpiasno fo =iacoF=mnnCtcgtmiSu&;g lehdchspuor.ay