Radiology reporting standard

Bosniak

The Bosniak classification, updated in version 2019, sorts cystic renal masses on CT and MRI into classes I, II, IIF, III and IV by wall, septa, enhancement, mural nodules and attenuation, from simple benign cysts to masses likely to be malignant.

Bosniak through RadVector API Bosniak in RadVector Reporting

Draft · advisoryDraft criteria pack under validation; RadVector answers as advisory and marks the result not usable for output.

At a glance

What Bosniak is

Full name: Bosniak Classification of Cystic Renal Masses, Version 2019
Edition RadVector applies: Version 2019
Published by: Silverman SG et al., Radiology 2019
Applies to: Cystic renal masses on CT and MRI.
Modality: Renal CT and MRI

Official source: Bosniak Classification, Version 2019 (Radiology)

Bosniak categories

I: Simple cyst: benign.
II: Benign cyst with minimal features, or a homogeneous lesion in defined attenuation ranges.
IIF: Probably benign: imaging follow-up.
III: Indeterminate: thick or irregular enhancing wall or septa.
IV: Enhancing nodule: likely malignant.

A short summary in our own words. Use the official Bosniak documents for the complete criteria.

How RadVector applies it

Bosniak, applied the same way every time.

The same deterministic engine grades Bosniak inside RadVector Reporting and through RadVector API, and a test keeps the two answers identical.

Grades any described renal cyst on any exam, including a cyst seen in the upper abdomen on a chest CT.
Reads Hounsfield units by phase: simple fluid, the class II attenuation bands, and a pre and post contrast pair that measures enhancement itself.
When an attenuation is not encoded by the classification, names enhancement and a renal mass protocol CT or MRI as what would decide it.

Radiologists and imaging centers

RadVector Reporting supplies the Bosniak category and recommendation to the report draft from the radiologist's own findings, cites the guidance applied, and keeps a per-report governance record. The radiologist signs.

radcloud.net

Software teams and AI companies

RadVector API returns the Bosniak verdict with pack version, validation status and a trace id, as JSON or FHIR R4, with a sandbox key and synthetic fixtures to start.

Developer guide

Hospitals and enterprise imaging

One versioned Bosniak implementation across reporting, QA and other AI systems' results, with an audit trail of which pack version graded each report.

Talk to us

Bosniak questions

Can RadVector assign a Bosniak class from a report sentence?

Yes, as decision support. RadVector reads the cyst's wall, septa, enhancement, nodules and Hounsfield units from the radiologist's description and returns the Bosniak 2019 class, or names the feature it needs. The Bosniak pack is a draft under validation, so the result is advisory.

What does RadVector do with a low-density renal mass of 30 to 70 HU?

Version 2019 does not assign a class to every attenuation. When a value falls outside the ranges the classification encodes, RadVector defers and names enhancement measurement and a renal mass protocol CT or MRI as the step that would decide it.

Other reporting standards

RadVector is clinical decision support for qualified professionals, not a diagnostic device; the radiologist makes the final determination.