Table 2: Pathological features of SMF and other mesenchymal tumors.
(a)

Histological features

Superficial myofibroblastoma  
(SMF)
Usually moderate, sometimes hypocellularity  
Fine and dense collagen in stroma  
Small to medium-sized dilated vessels, often centrally located

Cellular angiofibroma,Moderate cellularity  
Wispy collagen stroma  
Medium-sized vessels, often with hyalinized walls

Mammary type myofibroblastoma,Moderate to hypercellularity  
Thick collagen bundle in stroma, adipose tissues may be present  
Blood vessels are not prominent

Angiomyofibroblastoma,   
(AMF)
Alternating zones of hyper- and hypocellularity.   
Loose texture, contains mast cells in stroma, adipose tissues may be present  
Small to medium-sized capillary-like vessels around which epithelioid stroma cells are clustered

Aggressive angiomyxoma  
(AA)
Hypocellularity  
Myxoid stroma, entrapped tissue may be present  
Numerous blood vessels varying from small size to large size with thick muscular walls

(b)

ERPgRDesminSMACD34

Superficial myofibroblastoma80-100%  
(+)
80-100%  
(+)
75-100%  
(+)
0-45%  
(+)
50-85%  
(+)

Cellular angiofibromavariable expressionvariable expressionvariable expressionvariable expressionvariable expression

Mammary-type myofibroblastomaNDNDusually   
expressed
variable   
expression
usually   
expressed

Angiomyofibro  
-blastoma
usually expressedusually expressedusually expressedless commonless common

Aggressive angiomyxoma(+)(+)(+)variable expressionvariable  
expression