Hemangiopericytoma (HPC)-like pattern (branching staghorn-like vessels)

Storiform pattern (cartwheel-like arrangement of cells)

Whorling pattern (concentric growth of tumor cells)

Nested pattern (packets of cells with intervening stroma)

Alveolar pattern (nests with central discohesion)

Alveolar pattern (nests with central discohesion)

Herringbone pattern (fascicles alternating at acute angles)

Basaloid tumors (resembling basal cell carcinoma)

Nuclear palisading in spindle cell tumors

Biphasic tumors (epithelial and stromal components)
