Table of Contents

Dermatofibroma – aneurysmal variant

LEGEND

Features of classic dermatofibroma with hemosiderin deposits

Extravasation of erythrocytes with formation of pseudo-vascular spaces

  • Also called the hemosiderotic variant

  • Presence of a Grenz zone

Dermatofibroma – aneurysmal variant

Multinucleated giant cells

Dermatofibroma – aneurysmal variant

LEGEND

  • Hemosiderin deposits

  • Pseudo-vascular slits

Dermatofibroma – aneurysmal variant

All classical features of a DF may be observed along with hemosiderin deposits

  • Multinucleated giant cells
  • Spindle-shaped and triangular fibroblasts
  • Peripheral keloidal collagen
  • Presence of a Grenz zone

Dermatofibroma – aneurysmal variant

Perivascular lymphocytes found at the periphery

Dermatofibroma – aneurysmal variant

LEGEND

  • Marked extravasation of erythrocytes with formation of pseudo-vascular spaces

Dermatofibroma – aneurysmal variant

LEGEND

  • Here is another example. Features of a classic dermatofibroma are seen, especially at the periphery of the lesion where collagen is surrounded by fibroblasts (collagen entrapment).

  • Presence of a Grenz zone

  • Hemosiderin deposits

Dermatofibroma – aneurysmal variant

LEGEND

  • Lesion infiltrating the subcutaneous tissue

  • Marked extravasation of erythrocytes with formation of pseudo-vascular spaces