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That's where prostate volume and PSA density come in.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"This calculator takes your prostate dimensions from an ultrasound or MRI report and converts them into a volume estimate using the standard ellipsoid formula. Pair that with your PSA blood test result, and you get your PSA density — a number that helps put your PSA into proper context. Whether you're a urologist checking numbers between patients or someone sitting at home trying to make sense of your imaging report before your next appointment, this tool gives you a clearer starting point for that conversation.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"What Is Prostate Volume and Why Does It Matter?","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"heading","version":1,"tag":"h2"},{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Your prostate is a small gland — roughly the size of a walnut in younger men — that sits just below the bladder. Its volume is measured in cubic centimeters (cc), and in a man under 40, a typical prostate measures about 20-25 cc.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Here's why that number matters more than most people realize.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"The prostate grows with age. By the time a man reaches his 60s or 70s, his prostate may be 40, 50, or even 80+ cc. This growth is usually benign prostatic hyperplasia (BPH) — not cancer — but a bigger prostate naturally produces more PSA. So when a blood test comes back with a PSA of 7.0 ng/mL, the critical follow-up question is whether that's a lot of PSA for the size of the gland producing it.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Prostate volume also drives treatment decisions. A 35 cc prostate with urinary symptoms might respond well to medication alone, while a 90 cc prostate causing the same symptoms may need a completely different surgical approach. 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Above it, further evaluation — potentially including an MRI or biopsy — is often recommended. But this threshold isn't a hard line. 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And if you take finasteride or dutasteride (common BPH medications), your measured PSA is artificially reduced by about 50% — so you'd need to double your result to get a truer picture.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":1,"textStyle":""},{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"If your PSA was drawn during an infection, shortly after a procedure, or while on medications that affect PSA, bring that up with your doctor. 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If you can, bring your last 2-3 PSA results with dates.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"listitem","version":1,"textFormat":1,"value":2},{"children":[{"detail":0,"format":1,"mode":"normal","style":"","text":"Write down your questions.","type":"text","version":1},{"detail":0,"format":0,"mode":"normal","style":"","text":" It's easy to forget what you wanted to ask once you're in the room. Even simple questions — \"Is my PSA density concerning?\" or \"Should we do an MRI?\" — are worth putting on paper.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"listitem","version":1,"textFormat":1,"value":3},{"children":[{"detail":0,"format":1,"mode":"normal","style":"","text":"Note any medications you're on.","type":"text","version":1},{"detail":0,"format":0,"mode":"normal","style":"","text":" Especially finasteride, dutasteride, or testosterone therapy, since these directly affect PSA levels.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"listitem","version":1,"textFormat":1,"value":4}],"direction":null,"format":"","indent":0,"type":"list","version":1,"textFormat":1,"listType":"bullet","start":1,"tag":"ul"},{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Remember that your urologist sees these numbers every day. What feels alarming on a lab report often looks very different when placed in the full clinical context.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Technical Notes","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"heading","version":1,"tag":"h2"},{"children":[{"detail":0,"format":1,"mode":"normal","style":"","text":"Formulas used:","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":1,"textStyle":""},{"children":[{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Prostate Volume (cc) = Length (cm) x Width (cm) x Height (cm) x pi/6","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"listitem","version":1,"value":1},{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"PSA Density (ng/mL/cc) = PSA (ng/mL) / Prostate Volume (cc)","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"listitem","version":1,"value":2},{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"pi/6 = approximately 0.5236, commonly rounded to 0.52 in clinical practice","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"listitem","version":1,"value":3}],"direction":null,"format":"","indent":0,"type":"list","version":1,"listType":"bullet","start":1,"tag":"ul"},{"children":[{"detail":0,"format":1,"mode":"normal","style":"","text":"Unit conversions:","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":1,"textStyle":""},{"children":[{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"1 cc = 1 mL = 1,000 mm3","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"listitem","version":1,"value":1},{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Inputs in millimeters are converted to centimeters before volume calculation","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"listitem","version":1,"value":2}],"direction":null,"format":"","indent":0,"type":"list","version":1,"listType":"bullet","start":1,"tag":"ul"},{"children":[{"detail":0,"format":1,"mode":"normal","style":"","text":"Clinical references:","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":1,"textStyle":""},{"children":[{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"The ellipsoid formula is endorsed by the American Urological Association (AUA) and the European Association of Urology (EAU) for estimating prostate volume from imaging.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"listitem","version":1,"value":1},{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"The 0.15 ng/mL/cc PSA density threshold is referenced in active surveillance guidelines and multiple biopsy decision frameworks.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"listitem","version":1,"value":2}],"direction":null,"format":"","indent":0,"type":"list","version":1,"listType":"bullet","start":1,"tag":"ul"},{"children":[{"detail":0,"format":1,"mode":"normal","style":"","text":"Disclaimer:","type":"text","version":1},{"detail":0,"format":0,"mode":"normal","style":"","text":" This calculator is for educational and informational purposes only. It does not provide medical advice, diagnosis, or treatment recommendations. Always consult a qualified healthcare professional about your specific situation. Clinical decisions should never be based solely on calculator results.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":1,"textStyle":""}],"direction":null,"format":"","indent":0,"type":"root","version":1}}},"id":"6979a749a1775b000470e8c2"}]}]}],"$L36"]}],"$L37"]}]]}]}]}]
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2d:[["$","title","0",{"children":"Prostate Volume Calculator & PSA Density Calculator"}],["$","meta","1",{"name":"description","content":"Calculate prostate volume and PSA density from ultrasound or MRI measurements. Free tool with ellipsoid formula and interpretation ranges."}],["$","link","2",{"rel":"canonical","href":"https://activecalculator.com/calculators/health/prostate-volume-calculator"}],["$","meta","3",{"property":"og:title","content":"Prostate Volume Calculator & PSA Density Calculator"}],["$","meta","4",{"property":"og:description","content":"Calculate prostate volume and PSA density from ultrasound or MRI measurements. Free tool with ellipsoid formula and interpretation ranges."}],["$","meta","5",{"property":"og:url","content":"https://activecalculator.com/calculators/health/prostate-volume-calculator"}],["$","meta","6",{"property":"og:site_name","content":"ActiveCalculator"}],["$","meta","7",{"property":"og:locale","content":"en_US"}],["$","meta","8",{"property":"og:image","content":"https://activecalculator.com/api/og/calculator?title=Prostate%20Volume%20Calculator%20%26%20PSA%20Density%20Calculator"}],["$","meta","9",{"property":"og:image:width","content":"1200"}],["$","meta","10",{"property":"og:image:height","content":"630"}],["$","meta","11",{"property":"og:image:alt","content":"Prostate Volume Calculator & PSA Density Calculator"}],["$","meta","12",{"property":"og:type","content":"website"}],["$","meta","13",{"name":"twitter:card","content":"summary_large_image"}],["$","meta","14",{"name":"twitter:site","content":"@activecalculator"}],["$","meta","15",{"name":"twitter:creator","content":"@activecalculator"}],["$","meta","16",{"name":"twitter:title","content":"Prostate Volume Calculator & PSA Density Calculator"}],["$","meta","17",{"name":"twitter:description","content":"Calculate prostate volume and PSA density from ultrasound or MRI measurements. Free tool with ellipsoid formula and interpretation ranges."}],["$","meta","18",{"name":"twitter:image","content":"https://activecalculator.com/api/og/calculator?title=Prostate%20Volume%20Calculator%20%26%20PSA%20Density%20Calculator"}],["$","link","19",{"rel":"icon","href":"/favicon.ico?756f06c5b2066fec","type":"image/x-icon","sizes":"48x48"}],["$","$L38","20",{}]]
36:["$","div",null,{"className":"bg-white rounded-lg shadow-sm p-8","children":[["$","h2",null,{"className":"typo-large mb-6 text-mist-950","children":"Frequently Asked Questions"}],["$","div",null,{"className":"space-y-6","children":[["$","div","0",{"className":"pb-6 last:pb-0","children":[["$","h3",null,{"className":"text-lg font-medium text-mist-950 mb-3","children":"What formula does this calculator use?"}],["$","div",null,{"className":"prose max-w-none text-mist-600","children":["$","$L32",null,{"content":{"root":{"children":[{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"The prolate ellipsoid formula: Length x Width x Height x pi/6. The pi/6 constant (approximately 0.52) converts three linear dimensions into an ellipsoid volume estimate. This is the same formula endorsed by the AUA and EAU and used in radiology departments worldwide.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""}],"direction":null,"format":"","indent":0,"type":"root","version":1}}}]}]]}],["$","div","1",{"className":"pb-6 last:pb-0","children":[["$","h3",null,{"className":"text-lg font-medium text-mist-950 mb-3","children":"What's considered a normal prostate volume?"}],["$","div",null,{"className":"prose max-w-none text-mist-600","children":["$","$L32",null,{"content":{"root":{"children":[{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"For men under 50, about 20-25 cc. After that, the prostate grows roughly 0.5-1.0 cc per year due to benign growth. So a volume of 35 cc at age 60 or 45 cc at age 70 is common and usually not concerning on its own. The clinical significance depends more on symptoms and PSA context than on the number alone.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""}],"direction":null,"format":"","indent":0,"type":"root","version":1}}}]}]]}],["$","div","2",{"className":"pb-6 last:pb-0","children":[["$","h3",null,{"className":"text-lg font-medium text-mist-950 mb-3","children":"What PSA density level should I be worried about?"}],["$","div",null,{"className":"prose max-w-none text-mist-600","children":["$","$L32",null,{"content":{"root":{"children":[{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"The 0.15 ng/mL/cc threshold is the most widely cited. Above that, your urologist is more likely to recommend additional workup. But \"worried\" is a strong word — many men above 0.15 have completely benign biopsies. Think of it as a threshold that shifts the conversation toward further investigation, not as a cancer diagnosis.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""}],"direction":null,"format":"","indent":0,"type":"root","version":1}}}]}]]}],["$","div","3",{"className":"pb-6 last:pb-0","children":[["$","h3",null,{"className":"text-lg font-medium text-mist-950 mb-3","children":"Can PSA density tell me if I have cancer?"}],["$","div",null,{"className":"prose max-w-none text-mist-600","children":["$","$L32",null,{"content":{"root":{"children":[{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"No. Only a biopsy can diagnose prostate cancer. PSA density is a risk-stratification tool — it helps your doctor decide whether the risk is high enough to justify a biopsy. A PSA density of 0.20 doesn't mean you have cancer. It means the question is worth pursuing.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""}],"direction":null,"format":"","indent":0,"type":"root","version":1}}}]}]]}],["$","div","4",{"className":"pb-6 last:pb-0","children":[["$","h3",null,{"className":"text-lg font-medium text-mist-950 mb-3","children":"Why not just look at PSA alone?"}],["$","div",null,{"className":"prose max-w-none text-mist-600","children":["$","$L32",null,{"content":{"root":{"children":[{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Because PSA alone doesn't know how big your prostate is. A 70-year-old with a large 65 cc prostate and a PSA of 7.0 ng/mL has a density of 0.11 — probably benign. A 55-year-old with a 28 cc prostate and that same PSA of 7.0 has a density of 0.25 — a very different risk profile. PSA density adds the size context that PSA alone is missing.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""}],"direction":null,"format":"","indent":0,"type":"root","version":1}}}]}]]}],"$L39","$L3a","$L3b","$L3c","$L3d"]}]]}]
37:["$","div",null,{"className":"lg:col-span-2","children":[["$","div",null,{"className":"sticky top-24 mb-6 max-h-[calc(100vh-6rem)] overflow-y-auto space-y-4","children":[false,["$","div",null,{"className":"bg-white rounded-lg shadow-sm p-4","children":["$","nav",null,{"aria-label":"Table of contents","children":[["$","h2",null,{"className":"text-lg font-display font-normal mb-4 text-mist-900","children":"Table of Contents"}],["$","ul",null,{"className":"space-y-2.5","children":[["$","li","what-is-prostate-volume-and-why-does-it-matter",{"className":"","children":["$","$L6",null,{"className":"block py-1 text-mist-600 hover:text-mist-900 hover:underline transition-colors leading-relaxed text-sm no-underline","href":"#what-is-prostate-volume-and-why-does-it-matter","children":"What Is Prostate Volume and Why Does It Matter?"}]}],["$","li","understanding-psa-density",{"className":"","children":["$","$L6",null,{"className":"block py-1 text-mist-600 hover:text-mist-900 hover:underline transition-colors leading-relaxed text-sm no-underline","href":"#understanding-psa-density","children":"Understanding PSA Density"}]}],["$","li","how-prostate-volume-is-measured",{"className":"","children":["$","$L6",null,{"className":"block py-1 text-mist-600 hover:text-mist-900 hover:underline transition-colors leading-relaxed text-sm no-underline","href":"#how-prostate-volume-is-measured","children":"How Prostate Volume Is Measured"}]}],["$","li","imaging-methods",{"className":"ml-3","children":["$","$L6",null,{"className":"block py-1 text-mist-600 hover:text-mist-900 hover:underline transition-colors leading-relaxed text-sm no-underline","href":"#imaging-methods","children":"Imaging Methods"}]}],["$","li","which-measurements-do-you-need",{"className":"ml-3","children":["$","$L6",null,{"className":"block py-1 text-mist-600 hover:text-mist-900 hover:underline transition-colors leading-relaxed text-sm no-underline","href":"#which-measurements-do-you-need","children":"Which Measurements Do You Need?"}]}],["$","li","how-to-use-this-calculator",{"className":"","children":["$","$L6",null,{"className":"block py-1 text-mist-600 hover:text-mist-900 hover:underline transition-colors leading-relaxed text-sm no-underline","href":"#how-to-use-this-calculator","children":"How to Use This Calculator"}]}],["$","li","worked-example",{"className":"ml-3","children":["$","$L6",null,{"className":"block py-1 text-mist-600 hover:text-mist-900 hover:underline transition-colors leading-relaxed text-sm no-underline","href":"#worked-example","children":"Worked Example"}]}],["$","li","understanding-your-results",{"className":"","children":["$","$L6",null,{"className":"block py-1 text-mist-600 hover:text-mist-900 hover:underline transition-colors leading-relaxed text-sm no-underline","href":"#understanding-your-results","children":"Understanding Your Results"}]}],["$","li","whats-a-normal-prostate-volume",{"className":"ml-3","children":["$","$L6",null,{"className":"block py-1 text-mist-600 hover:text-mist-900 hover:underline transition-colors leading-relaxed text-sm no-underline","href":"#whats-a-normal-prostate-volume","children":"What's a Normal Prostate Volume?"}]}],["$","li","psa-density-what-the-numbers-mean",{"className":"ml-3","children":["$","$L6",null,{"className":"block py-1 text-mist-600 hover:text-mist-900 hover:underline transition-colors leading-relaxed text-sm no-underline","href":"#psa-density-what-the-numbers-mean","children":"PSA Density: What the Numbers Mean"}]}],["$","li","age-adjusted-context",{"className":"ml-3","children":["$","$L6",null,{"className":"block py-1 text-mist-600 hover:text-mist-900 hover:underline transition-colors leading-relaxed text-sm no-underline","href":"#age-adjusted-context","children":"Age-Adjusted Context"}]}],["$","li","factors-that-can-affect-your-results",{"className":"","children":["$","$L6",null,{"className":"block py-1 text-mist-600 hover:text-mist-900 hover:underline transition-colors leading-relaxed text-sm no-underline","href":"#factors-that-can-affect-your-results","children":"Factors That Can Affect Your Results"}]}],"$L3e","$L3f"]}]]}]}]]}],"$L40"]}]
39:["$","div","5",{"className":"pb-6 last:pb-0","children":[["$","h3",null,{"className":"text-lg font-medium text-mist-950 mb-3","children":"Where do I find my prostate measurements?"}],["$","div",null,{"className":"prose max-w-none text-mist-600","children":["$","$L32",null,{"content":{"root":{"children":[{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"On your radiology report from a transrectal ultrasound, MRI, or CT scan. Look for three dimensions listed in centimeters, typically labeled AP (anteroposterior), TR or transverse, and CC or craniocaudal. If your report just says something like \"prostate measures 4.0 x 3.5 x 3.2 cm,\" those are your three numbers. When in doubt, ask your radiologist or urologist which values to use.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""}],"direction":null,"format":"","indent":0,"type":"root","version":1}}}]}]]}]
3a:["$","div","6",{"className":"pb-6 last:pb-0","children":[["$","h3",null,{"className":"text-lg font-medium text-mist-950 mb-3","children":"Does prostate volume change which treatments are available?"}],["$","div",null,{"className":"prose max-w-none text-mist-600","children":["$","$L32",null,{"content":{"root":{"children":[{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Yes, and it's one of the more practical reasons to know your volume. For BPH, smaller prostates (under 30-40 cc) are candidates for medications like alpha-blockers or office-based procedures like UroLift. Larger prostates (over 80 cc) often require different approaches — holmium laser enucleation, Aquablation, or open simple prostatectomy. For prostate cancer, gland size affects radiation dosimetry, brachytherapy eligibility, and surgical planning.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""}],"direction":null,"format":"","indent":0,"type":"root","version":1}}}]}]]}]
3b:["$","div","7",{"className":"pb-6 last:pb-0","children":[["$","h3",null,{"className":"text-lg font-medium text-mist-950 mb-3","children":"How accurate is the ellipsoid formula?"}],["$","div",null,{"className":"prose max-w-none text-mist-600","children":["$","$L32",null,{"content":{"root":{"children":[{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Within about 10-15% of the true volume for most prostates. It tends to overestimate slightly in smaller glands and underestimate in very large or asymmetric ones. MRI measurements are generally more consistent than ultrasound. For clinical decision-making, this margin is well-accepted — it's accurate enough to guide PSA density interpretation and treatment planning.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""}],"direction":null,"format":"","indent":0,"type":"root","version":1}}}]}]]}]
3c:["$","div","8",{"className":"pb-6 last:pb-0","children":[["$","h3",null,{"className":"text-lg font-medium text-mist-950 mb-3","children":"I'm on finasteride. How should I interpret my PSA density?"}],["$","div",null,{"className":"prose max-w-none text-mist-600","children":["$","$L32",null,{"content":{"root":{"children":[{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Finasteride and dutasteride reduce measured PSA by roughly 50%. To get a more accurate PSA density, multiply your measured PSA by 2 before dividing by your prostate volume. For example, if your measured PSA is 3.0 ng/mL on finasteride, use 6.0 ng/mL as your adjusted PSA for the density calculation. Make sure your urologist knows you're on this medication — it changes how every PSA-related metric is interpreted.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""}],"direction":null,"format":"","indent":0,"type":"root","version":1}}}]}]]}]
3d:["$","div","9",{"className":"pb-6 last:pb-0","children":[["$","h3",null,{"className":"text-lg font-medium text-mist-950 mb-3","children":"When should I see a doctor about my results?"}],["$","div",null,{"className":"prose max-w-none text-mist-600","children":["$","$L32",null,{"content":{"root":{"children":[{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"This calculator is a starting point, not a finish line. Talk to your doctor if your PSA density is above 0.15, if your PSA has been trending upward over your last few tests, if you have a family history of prostate cancer (especially a first-degree relative diagnosed before age 65), or if you're experiencing urinary symptoms that bother you. Bring your numbers to the appointment — they'll give your urologist a head start.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""}],"direction":null,"format":"","indent":0,"type":"root","version":1}}}]}]]}]
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