NBME Step 2 CK Form 7 Fibrosis of the sternomastoid muscle (NBME Answers)

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Retired NBME Step 2 CK Form 7 Answers

step2ck_form7/Block 4/Question#25 (reveal difficulty score)
A 6-week-old boy is brought to the physician ...
Fibrosis of the sternomastoid muscle 🔍 / 📺 / 🌳 / 📖
tags: msk peds

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submitted by ∗step_prep5(246)

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6 week old newborn who had a difficult delivery via forceps who now has his head rotated to the left with contralateral chin deviation with a nontender mass in the right side of the neck, most consistent with torticollis
Torticollis: Neck mass + ipsilateral head tilt + contralateral chin deviation

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step_prep5 https://www.correctivechiropractic.com/blog/can-chiropractic-help-torticollis-infants-children/ +

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submitted by ∗ht3(25)

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If the chin is deviated to the right, then wouldn't the "mass" (which I assume is the tight SCM muscle) be on the LEFT side of the neck??

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cinnapie Contraction of right SCM moves your chin to the left. I know its weird to think that the SCM kinda pushes the chin away but its how the origin and insertion of the muscle is. +3

fkstpashls If you're slouching in bed with your mouth open wondering why you get rammed by another question, tense up your SCM on one side and you'll feel your jaw move to the opposite. +

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