Table 1

Histologic criteria employed in this study for the diagnosis of uterine smooth muscle tumors

Diagnosis

Tumor cell necrosis

Atypia

MF/10 HPF*


Leiomyosarcoma

Present

Diffuse moderate to severe

Any level


Present

None to mild

≥ 10


Absent

Diffuse moderate to severe

≥ 10


STUMP

Present

None to mild

< 10


Absent

Diffuse moderate to severe

5-9 or atypical mitotic figures


Absent

Focal moderate to severe

≥ 5


Atypical leiomyoma

Absent

Focal or diffuse moderate to severe

< 5


Leiomyoma

Absent

None to mild

< 5


*Mitotic figures per 10 High power field

Hewedi et al. Diagnostic Pathology 2012 7:1   doi:10.1186/1746-1596-7-1

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