Bednar Tumour Occurring after Malignant Melanoma Excision

Table 2

Bednar tumour: differential diagnosis by immunohistochemistry (SCC: squamous cell carcinoma; MM: malignant melanoma; SS: synovial sarcoma).

	Bednar tumour	Pigmented neurofibroma	Leiomyosarcoma	SCC	MM	SS	Solitary fibrous tumour
CD34	+ (spindle)	-	-	-	-	-	+
Vimentin	+ (spindle)	+ (diffuse)	+	-	-	+	+
S100	+ (pigmented)	+ (focal)	-	-	+	-/+ (40%)	-
-actin	-	-	+	-	-	-	+
Desmin	-	-	+	-	-	-	-
Cytokeratin	-	-	-	+	-	+ (90%)	-
Melan-A	+ (pigmented)	-	-	-	+/-	-	-
HMB-45	+ (pigmented)	-	-	-	+/-	-	-
CD99	+/- (80%)	-	-	-	-	+	+
EMA	-	-	-	+	-	+ (50%)	+
BCL-2	+	-	-	-	-	+	+