Giant benign phyllodes breast tumour with pulmonary nodule mimicking malignancy: A case report

Table 2 Histologic features of benign, borderline and malignant phyllodes tumors (adopted from the World Health Organization classification 2012)

Histologic features	Benign	Borderline	Malignant
Stromal hypercellularity	Mild	Moderate	Marked
Stromal mitotic activity	0-4/10 HPF	5-9/10 HPF	≥ 10/10 HPF
Stromal cell atypia	Mild	Moderate	Marked
Stromal overgrowth	Absent	Absent or focal	Often present
Tumour borders	Well-defined	Well-defined focally infiltrative	Infiltrative
Malignant heterologous elements	Absent	Absent	May be present