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Epidermal Inclusion Cyst
Epidermoid Cyst of Bone
General Considerations
- Associated with trauma, especially penetrating trauma
- Usually in bones that are superficially located such as fingers, foot and calvarium
- Implantation of epithelium that form cysts leading to bone erosion
- Subungual crush-type injuries have been associated with inclusion cysts as has prior surgery
Clinical Findings
- May develop with in weeks or years of fingertip injury
- Pain at site of lesion
- Mass
Imaging Findings
- Frequently seen in terminal phalanx
- Solitary, lytic lesion
- May be expansile
- May have a thin sclerotic border
Differential Diagnosis
- Enchondroma
- Metastases (rare)
- Glomus tumor
Treatment
Complications
- May recur if incompletely curetted
Prognosis
Epidermal Inclusion Cyst. White arrows pint to an expansile lytic lesion in the terminal phalanx
of the index finger in a characteristic location for an epidermal inclusion cyst of the hand.
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