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Retired NBME 20 Answers

nbme20/Block 3/Question#7 (reveal difficulty score)
A 10-year-old boy has a palpable mass in the ...
Endoderm of foramen caecum ๐Ÿ” / ๐Ÿ“บ / ๐ŸŒณ / ๐Ÿ“–
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 +8  upvote downvote
submitted by โˆ—xxabi(293)
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This is a thyroglossal duct cyst. The tyroglossal duct may persist and result in a thyroglossal duct cyst (occurring in midline near hyoid bone or at the base of the tongue), thus will classically move up with swallowing or tongue protrusion.

The foramen cecum (of the tongue) is the normal remnant of the thyroglossal duct

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lilyo  I got it wrong though because the question clearly asks what does this structure (thyroglossal duct) DEVELOP from, not this structure eventually develops to form which structure. If it asked that then I would have picked option A but because it didnt that was the first option I crossed out. +16
misterdoctor69  It was a poorly worded question no doubt. But when they say "endoderm of foramen cecum" they're referring to the endoderm which is a primitive structure. The "foramen cecum" part is just a modifier that is added to describe what that endoderm would eventually become. +1
lovebug  FA 2019, page 322page! +1



 +2  upvote downvote
submitted by โˆ—hungrybox(1277)
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The endoderm of the 3rd and 4th pouches form the parathyroid gland and the parafollicular cells of the thyroid gland.

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