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NBME 20 Answers

nbme20/Block 1/Question#27 (23.3 difficulty score)
A 53-year-old woman comes to the physician ...
Schistosoma mansoni 🔍
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 +7 
submitted by monoloco(132),
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 +4 
submitted by strugglebus(163),
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tI soal ooldke eyxalct keil htmciosesos on hte i-sld-tie dha eth leiltt .snipe tanombaeE lowdu aehv dah a hnbcu of sCBR sie.nid




 +3 
submitted by hellohello(8),

Schistosoma mansoni and haematobium can be ID'd by their unique spines. S. mansoni has a lateral spine as seen on the path while S. haematobium has a terminal spine (S. japonicum has no spine).

See following for path comparisons (mansoni L, haematobium M, japonicum R)

https://www.yourgenome.org/sites/default/files/images/photos/Schistosome%20eggs.jpg

fatboyslim  Schistosoma haemaTobium: spine is on the Tip ("T" for Tip and haemaTobium) and Schistosoma manSoni has a spine on the Side ("S" for manSoni and Side) +2  
kevin  nice +  
thegooddoctor  Excellent explanation! +3  



 +2 
submitted by usmleaspirant5(2),
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ossathciomS hsa nspsei aeehwsr riiadGa otsend aehv a sipne