LEGEND

Well-defined tumor

Well-defined, non-encapsulated nodule that can extend into the hypodermis

Composed of spindle cells in a pale pink fibrillary stroma, often referred to as “bubble-gum” pink

Spindle cells with random arrangement

LEGEND

Well-defined, non-encapsulated tumor

LEGEND

Spindle cells in a pale pink fibrillary stroma

No particular organization

Well-defined tumor

Non-encapsulated tumor localized in the dermis

Stroma paler compared to the peripheral collagen

So-called “bubble-gum” stroma

LEGEND

Mainly composed of fibroblasts, Schwann cells, perineural cells, and mast cells (they may be present in variable quantities)

LEGEND

Fibrillary stroma