paediatrics Brussels 17

JBJS 1998

Grade Percentage Necrosis

Histologic Appearance

I

0-49

Little or no necrosis

G2

G1

I

II

50-89

Areas of acellular tumor osteoid and/or fibrotic material attribuitable to the effect of chemotherapy, with other areas of viable tumor Predominant areas of acellular tumor osteoid and/or fibrotic material attribuitable to the effect of chemotherapy, with only scattered foci of viable tumor cells No pathologic evidence of viable tumor within the specimen

II

III

90-99

III

IV

100

IV

G3