Ulcerated nodule on the forehead of an old lady | Figure 1

Ulcerated nodule on the forehead of an old lady

86 yo woman with 5 cm nodule with relatively recent onset on her forehead. The lesion appears to be partially ulcerated on the surface. The histology reveals a polymorphic proliferation of cells with brisk mitotic activity (some of them highly atypical) in the dermis. There is no striking tendency to infiltrate the hypodermis.

Differential diagnosis? IHC?

The author made an update to this case.

Update 1

Positive IHC: CD10. Final diagnosis: atypical fibroxanthoma.