Saved Results

No results saved yet.

Enter a patient name and hit Save on a result.

Clinical calculator summary

Masaoka-Koga Staging (Thymoma)

The Masaoka-Koga staging system describes the anatomic extent of thymoma, specifically regarding capsular invasion and involvement of surrounding structures.

Evidence-based context for fast calculator use

Purpose:
Masaoka-Koga staging classifies thymoma invasion depth to guide surgical resection planning and adjuvant therapy decisions in thymic tumors.
Population:
patients undergoing thoracic oncology risk, staging, or nodule assessment
Factors:
Level of Invasion
Reference:
Koga K, et al. A review of 79 thymomas: modification of staging system and reassessment of conventional division into invasive and non-invasive thymoma. Pathol Int. 1994;44(5):359-367.
HomeMasaoka-Koga Staging (Thymoma)
Pin your most used calculators here by clicking the star in the dropdown.

Masaoka-Koga Staging (Thymoma)

Clinical Context & Background

The Masaoka-Koga staging system describes the anatomic extent of thymoma, specifically regarding capsular invasion and involvement of surrounding structures. It is the primary determinant of treatment (surgery vs chemoradiation) and prognosis.
Primary Source EvidenceKoga K, et al. A review of 79 thymomas: modification of staging system and reassessment of conventional division into invasive and non-invasive thymoma. Pathol Int. 1994;44(5):359-367.
Formula Logic
Stage I-IV based on invasion level.

Reference Data

StageDescriptionManagement
IEncapsulated, No invasionSurgery alone
IIAMicroscopic capsular invasionSurgery +/- RT
IIBMacroscopic invasion into fatSurgery + RT
IIIInvasion of neighboring organsChemo + Surgery + RT
IVDisseminated (Pleural/Pericardial/Distant)Systemic Therapy

Clinical Workflow

Use, Interpret, And Continue The Patient Pathway

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

When To Use

  • Use Masaoka-Koga Staging (Thymoma) when masaoka-Koga staging classifies thymoma invasion depth to guide surgical resection planning and adjuvant therapy decisions in thymic tumors.
  • 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 I through IV.
  • 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 Level of Invasion, 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.

Share This Calculator

Share:

Related Tools

Small Cell Lung Cancer Staging (VALSG)Solitary Pulmonary Nodule Malignancy Risk (Mayo)Herder Model (Pulmonary Nodule)

Frequently Asked Questions

When should Masaoka-Koga Staging (Thymoma) 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 Masaoka-Koga Staging (Thymoma) 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.