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*Nodular or diffuse growth pattern surrounded by a dense fibrous stroma. | *Nodular or diffuse growth pattern surrounded by a dense fibrous stroma. | ||
*Infiltrative border - '''important'''. | *Infiltrative border - '''important'''. | ||
**The key difference with adenoma in cases where there isn't significant nuclear atypia. | **The key difference with [[sebaceous adenoma]] in cases where there isn't significant nuclear atypia. | ||
*+/-Nuclear atypia. | *+/-Nuclear atypia. | ||
*+/-Squamous differentiation. | *+/-Squamous differentiation. | ||
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DDx: | DDx: | ||
*[[Sebaceous adenoma]]. | |||
*[[Squamous cell carcinoma]], clear cell variant. | *[[Squamous cell carcinoma]], clear cell variant. | ||
*[[Malignant melanoma]]. | *[[Malignant melanoma]]. |
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