Ovarian-Adnexal O-RADS (US) Risk Stratification — free guideline decision tool

Look up the malignancy risk and management for an ACR O-RADS US ovarian-adnexal category (0–5). Instant, browser-side.

1 normal (0%), 2 almost certainly benign (< 1%), 3 low (1–< 10%), 4 intermediate (10–< 50%), 5 high (≥ 50%) risk of malignancy.

Translate an O-RADS US category into a follow-up, MRI or gyn-oncology pathway.

O-RADS 3 with a solid lesion still warrants MRI characterisation. O-RADS 4 → MRI or gynaecology evaluation; consider CA-125. O-RADS 5 (irregular solid, high colour score, ascites/peritoneal nodules) → gyn-oncology referral. Categories follow the US lexicon (lesion type, solid component, colour score).

For licensed clinicians and clinical researchers. Interpret results with history, investigations and local protocols; not a diagnosis or prescription, and not a substitute for multidisciplinary decision-making or local guidelines.

Inputs: O-RADS US category 0 — Incomplete evaluation → Result: Management Further evaluation（Category: O-RADS 0: Incomplete evaluation, Management: Inadequate assessment due to technical/patient factors: repeat or use transvaginal ultrasound / MRI for further evaluation, Note: O-RADS US categorises by lesion type (unilocular/multilocular/solid), solid component and colour score; the final category needs physician integration of the lexicon） Inputs: O-RADS US category 5 — High risk → Result: Management Gyn-oncology referral（Category: O-RADS 5: High risk (≥ 50%), Management: Irregular solid lesion, multilocular with solid component and high colour score, or ascites/peritoneal nodules: refer to gyn-oncology, Note: O-RADS US categorises by lesion type (unilocular/multilocular/solid), solid component and colour score; the final category needs physician integration of the lexicon）