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Retired NBME 21 Answers

nbme21/Block 2/Question#19 (reveal difficulty score)
A 3-year-old boy who recently immigrated to ...
Increased proportions of osteoid ๐Ÿ” / ๐Ÿ“บ / ๐ŸŒณ / ๐Ÿ“–
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 +13  upvote downvote
submitted by โˆ—ragacha(17)
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PATHOMA page 196 DUE A OSTEOID DEPOSITION โ€ฆ RICKETS is due low vit D .. RACHITIC ROSARY due to osteoid deposition at the COSTOCHONDRIALJUCTION.

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 +10  upvote downvote
submitted by โˆ—lola915(57)
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Think of it this way: Kid has Vit.D deficiency/ Rickets. He needs Vit D to mineralize bone, which means make osteoid into mature bone. No Vitamin D means excess unmineralized bone aka osteoid.

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 +9  upvote downvote
submitted by โˆ—hayayah(1212)
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This pt has osteomalacia / rickets (since he's a kiddo). Caused by defective mineralization of osteoid (osteomalacia) or cartilaginous growth plates (rickets, only in children).

Most commonly d/t Vitamin D deficiency.

Children with rickets have pathologic bow legs (genu varum), bead-like costochondral junctions (rachitic rosary), craniotabes (soft skull).

  • Dec. Vitamin D (normal function is to reabsorb Ca2+ and PO4)

  • Dec. serum Ca2+

  • Dec. ย serum PO4

  • Inc. PTH

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lovebug  FA2019 455pg !!! +2



 +2  upvote downvote
submitted by โˆ—rdk3434(5)
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i couldnt even guess this was rickets homie

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divinedomain  you made my day +



 +0  upvote downvote
submitted by โˆ—beethove(0)
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sketchy path: rickets are "decreased mineralization of cartilage bone @ epiphyseal growth plate"

which I thought was choice A. " absence of cartilage @ epiphyseal growth plate". But I think that's referring to achondroplasia.

pppth

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