Blue Nevus
Epidemiology:
Common sites:
- common blue nevus:
- cellular blue nevus:
Gross features:
- common blue nevus:
- < 1.0cm
- slightly elevated or dome-shaped
- cellular blue nevus:
- > 1.5cm
- bluish dermal nodule or plaque
Histologic features:
- common blue nevus:
- well circumscribed, unencapsulated
- restricted to dermis, occasionally into
subcutaneous fat
- predilection for adnexal structures
- spindle cells with melanin pigment
- bipolar or dendritic shapes
- wrapping around bundles of collagen
- melanophages
- cellular blue nevus:
- well circumscribed, unencapsulated
- unpigmented spindle cells (some are pigmented upon close examination)
- cellular mass of interweaving fascicles
Immunophenotype:
Marker:
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Sensitivity:
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Specificity:
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Molecular features:
Other features: