RID5709 indistinct margin

synonym Unscharfer Rand ill-defined ill-defined margin not circumscribed - indistinct margin poorly defined margin poorly-defined margin smudgy margin

definition PIRADS: blurred. BI-RADS Mammo: No clear demarcation of the entire margin or any portion of it from the surrounding tissue (historically, "ill defined"). US: no clear demarcation between a mass and the surrounding tissue anywhere on the margin. [TIRADS]: Border of the nodule is difficult to distinguish from thyroid parenchyma; the nodule lacks irregular or lobulated margins.

comment "ill-defined" is sanctioned synonym for mammo, unsanctioned for US. [Not used in BI-RADS 5 MRI]