Splenic Mass with Indeterminate Imaging Features That Did Not Stabilise on Follow-Up MRI — What Are the Next Steps?

When a splenic mass carries indeterminate imaging features and fails to demonstrate stability on the 12-month follow-up MRI, serial observation is no longer sufficient. A structured escalation pathway then applies.

Clinical Scenario

The mass presents with features that do not permit a confident benign diagnosis on imaging alone: heterogeneous appearance, intermediate attenuation (> 20 HU), contrast enhancement, and smooth margins.

Prior Evaluation — Failure Condition Triggering This Protocol

The previous step consisted of follow-up MRI at 6 months and again at 12 months. This protocol applies when the splenic lesion did not prove stable at the 12-month examination — the stability target was not reached, necessitating escalation.

Next-Step Approach — Partial Overview

At this stage the approach moves toward further characterisation — involving either advanced imaging modalities or tissue-based assessment. Before any intervention on the spleen is undertaken, a surgical consultation is an integral part of the pathway. The complete structured protocol, including the specific steps, sequencing, and decision criteria, is available in full below.

Instant Access to Structured Evidence-Based Regimens

References

DOI: 10.1016/j.jacr.2013.05.020

Indeterminate imaging features: heterogeneous, intermediate attenuation (>20 HU), enhancement, smooth margins.

Further evaluation with PET or biopsy is recommended for incidentally discovered splenic masses with these features.

Before any intervention of the spleen is contemplated, a surgical consult is essential for backup.

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