J Korean Soc Surg Hand.  2011 Sep;16(3):179-184.

Intraosseous Epidermal Inclusion Cyst in the Distal Phalanx of Thumb with Cortical Destruction: A Case Report and Review of Literature

• Park JS
• Moon DK
• Park HB
• Cho SH

Abstract

Intraosseous epidermal inclusion cyst is a rare benign, cystic lesion. It is thought to result from traumatic implantation of epidermal elements into bone. Radiologic findings of intraosseous epidermal inclusion cysts are well-defined, lytic lesions. It is difficult to diagnose intraosseous epidermal inclusion cyst without pathologic diagnosis. We experienced a 43-year-old man with a history of trauma followed by painless expansion of his left thumb. Radiographs demonstrated a severe expansile, ill-defined lytic lesion with cortical destruction in the distal phalanx of left thumb, mimicking neoplastic bone lesion or infectious lesion. An intraosseous epidermal inclusion cyst was confirmed by pathologic diagnosis, which was lined by stratified squamous epithelium, containing keratinized cellular debris.

Keyword

Thumb; Bone tumor; Intraosseous epidermal inclusion cyst; Cortical destruction

MeSH Terms

Adult
Epithelium
Humans
Keratins
Thumb
Keratins