Epidermal Inclusion Cyst

Epidemiology

 

Most frequent tumour around distal phalanx

 

M>F 2:1

 

Mean age 3rd decade

 

Aetiology

 

Likely traumatic 

- subcutaneous implantation of keratinising epithelium that continues to grow and produce keratin

 

Clinical

 

Painless firm swellings

Most common volar aspect P3 index / middle

 

X-ray

 

Round / oval lesion in P3

- thinning of cortex

 

Epidermal Inclusion Cyst

 

Pathology

 

Fibrous capsule with keratin filled space

Squamous epithelium

 

DDx                       

 

Foreign Body Granuloma

 

Management    

 

Curettage and bone grafting (if bony)

 

Excision of lump

- recurrence very unusual