Adrenal Adenoma: CT Evaluation

Bearboat Software Logo
Bearboat Software

Schedule

Schedule

TRA Reference Material

Home

Links

Phones

Multicare
St Anthony
St Clare
St Francis
St Joseph
Milgard Center
TRA

Medical References

Procedures

Shoulder Arthrography
Hip Injections
Gadolinium Arthrography Mixture
Anticoagulation & Spine LP
16 Slice CTA Head & Neck
AAST Trauma Grading
Coronary CT Techniques at St Joseph
Rapid Rule Out Coronary CTA

General Information

Fetal Vulnerabilities
Intussusception Reduction
Pediatric Emergencies Reference
Neck Lymph Node Stations
Incidental Pulmonary Nodule on CT
Adrenal Adenoma CT
Appendicitis in Pregnancy MR
Iodinated Contrast
Contrast Information Potpourri - UW
McKesson Keyboard Shortcuts

MRI Protocols

Neuro Protocols

Brain
Head & Neck
Spine
Neurovascular

MSK Protocols

Routine
Arthrogram
Osteomyelitis
Mass vs Cyst

CT Protocols

Neuro CT
Chest CT
Abdomen CT

Web Sites

TRA Schedule (QGenda)
MESA Calcium Score Calculator
TRA_Medical_Imaging
TRA Medical Imaging

TRA Reference Material

HU=Hounsfield Unit

Non-contrast CT

if HU<15, then STOP --> benign adenoma in all likelihood (They tend to contain fat)

if HU>=15 give contrast and measure HU on two sets of CT images

Contrast CT (portal-venous and delayed)


  1. Precontrast density of mass: Cp   - measure HU pre-contrast
  2. Portal venous phase (60-90 sec scan): C+   - measure HU shortly after contrast
  3. 10 minutes post-contrast: Cd   - measure HU after washout

Then calculate the ratio

(C+ - Cd ) / (C+ - Cp) * 100 to get a percentage.

The percent indicates the washout

If washout < 50% not an adenoma

If washout > 50% adenoma

The idea is that adenoma do not retain the contrast very much over time