NBME 22 Metastatic carcinoma (NBME Answers)

NBME 22 Answers ↦

nbme22/Block 4/Question#27 (50.4 difficulty score)
A 78-year-old man comes to the physician ...
Metastatic carcinoma🔍,📺
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+9
submitted by notadoctor(159),

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Matistecat isedsae si rome momcon anht apymrir oebn u.smrto

lba9587 Might be helpful to consider eg. of a lung tumor. one lesion? you’re leaning lung primary. Multiple lesions in lung? METS. Q stem here included, “numerous lytic lesions along the vertebral column.” Thus, METS. +

jurrutia Also, pain that is worse at nights and persists regardless of activity. Paget's is typically asymptomatic (although pain is the most common symptom) and would have other findings (deformities, AV shunts, etc.) +

+4
submitted by oznefu(22),

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’mI ihnvag reotlbu tnuiadgrnsned hyw shti si a ttrbee hceioc tnah Pateg siaede,s cepillasey wtih teh csenrdiea ALP?

zelderonmorningstar Paget’s would also show some sclerosis. +5

seagull ALK is increased in bone breakdown too. Prostate loves spreading to the lumbar Spine. It's like crack-cocaine for cancer. +28

aesalmon I think the "Worse at night" lends itself more towards mets, and the pt demographics lean towards prostate cancer, which loves to go to the lumbar spine via the Batson plexus. I picked Paget but i think they would have given something more telling if they wanted pagets, histology or another clue +1

fcambridge @seagull and aesalmon, I think you're a bit off here. Prostate mets would be osteoblastic, not osteolytic as is described in the vignette. +17

sup Yeah I chose Paget's too bcz I figured if it wasn't prostate cancer (which as @fcambridge said would present w/ osteoblastic lesions) they would give us another presenting sx of the metastatic cancer (lung, renal, skin) that might point us in that direction. I got distracted by the increased ALP too and fell for Paget :( +1

kernicterusthefrog @fcambridge, not exactly. Yes, prostate mets tends to be osteoblastic, but about 30% are found to be lytic, per this study: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2768452/ Additionally, the night bone pains point to mets, and Paget's is much more commonly found in the cranial bones and appendicular skeleton, than axial. This could also be RCC mets! +

sweetmed I mainly ruled out pagets because they said the physical examination was normal. He would def have other symptoms. +4

cathartic_medstu From what I remember from Pathoma: Metastasis to bone is usually osteolytic with exception to prostate, which is osteoblastic. Therefore, stem says NUMEROUS lytic lesions and sounds more like metastasis. +5

medguru2295 If this is Metastatic cancer, it is likely MM. MM spreads to the spinal cord and causes Lytic lesions. It is NOT prostate as stated above. While Adenocarcinoma does spread to the Prostate, it produces only BLASTIC lesions. +

but prostate cancer is not lytic as blastic lesions

+4/- titanesxvi(82),

+3
submitted by j000(7),

multiple myeloma is the most common PRIMARY malignancy of bone (pathoma), so it's not MM.

it's not paget (lack other Sx, would also have sclerotic lesions)

mostly likely renal or lung cancer metast to the bone

+1
submitted by amphotericin(8),

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I lerud out aegts'P beauecs tea'sPg si ullusay azieocdll, rpe ,AF hPta,moa &;aBmBp. ghuhtoAl htsi npitaet dtiefyinel sift hte hicdrpmoaeg upc,tire tprsoeat enarcc si iteidynelf ont eht olyn cecran atth nca itzeaamsset ot hte noseb. uecBsae heset aer iclyt ,lessoin tsi' poyablrb esmo ehtor cacner stht'a edpsra ot eth onbes

medguru2295 Possibly Multiple Myeloma. That is classic for an older person with back pain and lytic lesions in the back. +

asharm10 osteolytic- multiple myeloma, Osteoblastic- Prostate; dont think beyond this for this exam, i have never seen a question in NBME or uworld they tried to fool us off on this concept so far. +1

euchromatin69 u world 341 same concept +

skuutnasty I'd like to reiterate what's stated above... dx NOT MM in this question because MM is PRIMARY not METASTATIC @ bone (answer reads: metastatic carcinoma) <3 +

+0
submitted by paperbackwriter(114),

I also chose Paget :/ but realized this which I didn't before:

The stages are not uniform across different bones, so you could have some bones that are in the osteoblastic stage, while others are in the lytic stage etc.

orthobullets.com/topic/8040/images/paget's%20bone%20scan.jpg

paperbackwriter oops: https://upload.orthobullets.com/topic/8040/images/paget's%20bone%20scan.jpg +