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Table 1 GI-RADS classification system for adnexal masses [11]

From: Diagnostic performance of GI-RADS reporting system in evaluation of adnexal masses

GIRADS grade

Diagnosis

Est. prob. malignancy

Details

1

Definitive benign

0%

Normal ovaries identified, and no adnexal mass seen

2

Very probably benign

< 1%

Adnexal lesions thought to be of functional origin, e.g. follicles, corpora lutea, hemorrhagic cysts

3

Probably benign

1–4%

Neoplastic adnexal lesions thought to be benign, such as endometrioma, teratoma, simple cyst, hydrosalpinx, paraovarian cyst, peritoneal pseudocyst, pedunculated myoma, or findings suggestive of pelvic inflammatory disease

4

Probably malignant

5–20%

Any adnexal lesion not included in GI-RADS 1–3 and with one or two findings suggestive of malignancy*

5

Very probably malignant

> 20%

Adnexal masses with three or more findings suggestive of malignancy*

  1. The asterisk denotes findings suggestive of malignancy included thick papillary projections, thick septa, solid areas with/without ascites and vascularization within solid areas