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Clinical calculator summary

Solitary Pulmonary Nodule Malignancy Risk (Mayo)

The Mayo Clinic model is a widely validated logistic regression model used to estimate the pre-test probability that a solitary pulmonary nodule (SPN) detected on imaging is malignant.

Evidence-based context for fast calculator use

Purpose:
Mayo Clinic model calculates malignancy probability for solitary pulmonary nodules to guide decisions on biopsy, resection, or CT surveillance.
Population:
patients undergoing thoracic oncology risk, staging, or nodule assessment
Factors:
Age, Current or Former Smoker?, History of Extrathoracic Cancer?, Nodule Diameter, Is the nodule spiculated?, Located in Upper Lobe?
Reference:
Swensen SJ, et al. The probability of malignancy in solitary pulmonary nodules. Application to small radiologically indeterminate nodules. Arch Intern Med. 1997;157(8):849-855.
HomeSolitary Pulmonary Nodule Malignancy Risk (Mayo)
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Solitary Pulmonary Nodule Malignancy Risk (Mayo)

years
mm

Clinical Context & Background

The Mayo Clinic model is a widely validated logistic regression model used to estimate the pre-test probability that a solitary pulmonary nodule (SPN) detected on imaging is malignant. It helps guide decisions regarding biopsy, resection, or surveillance.
Primary Source EvidenceSwensen SJ, et al. The probability of malignancy in solitary pulmonary nodules. Application to small radiologically indeterminate nodules. Arch Intern Med. 1997;157(8):849-855.
Formula Logic
Probability = e^x / (1 + e^x), where x is a weighted sum of age, smoking, cancer history, diameter, spiculation, and location.

Reference Data

ProbabilityRisk CategoryTypical Management
< 5%Low RiskSerial CT surveillance
5 - 65%Intermediate RiskPET/CT, Biopsy, or Surveillance
> 65%High RiskSurgical Resection

Clinical Workflow

Use, Interpret, And Continue The Patient Pathway

Expand for workflow guidance, limitations, examples, and related next steps.

When To Use

  • Use Solitary Pulmonary Nodule Malignancy Risk (Mayo) when mayo Clinic model calculates malignancy probability for solitary pulmonary nodules to guide decisions on biopsy, resection, or CT surveillance.
  • Confirm that the patient, diagnosis, disease phase, and available inputs match the cited model before calculation.

How To Interpret

  • Interpret the displayed result using the calculator-specific formula and reference table, spanning < 5% through > 65%.
  • A boundary result should prompt input verification and clinical review rather than false precision.

What To Do Next

  • Confirm whether the clinical question is screening eligibility, nodule malignancy, staging, or treatment prognosis and move to the corresponding thoracic pathway.
  • Document the inputs, result, timing, and clinical context so the assessment can be reproduced.

Limitations

  • Lung screening, nodule probability, radiology classification, and cancer staging tools answer different questions.
  • The result supports clinician judgment and does not independently determine treatment.

Validated Population

patients undergoing thoracic oncology risk, staging, or nodule assessment

How to apply this result

For a representative case, verify Age, Current or Former Smoker?, History of Extrathoracic Cancer?, calculate the result, and confirm that its classification matches the highlighted reference band before continuing the disease-specific pathway.

Lung & Thoracic Oncology hubContinue to related calculators and clinical workflow resources.

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Frequently Asked Questions

When should Solitary Pulmonary Nodule Malignancy Risk (Mayo) be used?

Use it for patients undergoing thoracic oncology risk, staging, or nodule assessment when all required inputs and the intended clinical setting are confirmed.

Can Solitary Pulmonary Nodule Malignancy Risk (Mayo) determine treatment by itself?

No. Interpret the result with the cited evidence, complete clinical assessment, current guidelines, and patient-specific goals.

Evidence-based oncology decision support. Verify with clinical guidelines.