Nodular Cutaneous Amyloidosis at the Temple

Area of Science:

• Dermatopathology
• Oncology

Background:

• Amyloidosis is a condition characterized by the deposition of abnormal proteins (amyloid) in tissues.
• While systemic amyloidosis has well-defined clinical implications, localized cutaneous amyloidosis is less understood.
• This case focuses on a rare presentation of amyloid deposition in the skin.

Observation:

• A 52-year-old woman presented with a large, slow-growing tumor on her right temple.
• The tumor was partially yellow and erythematous, with no palpable regional lymph nodes.
• Initial biopsy revealed eosinophilic material in the dermis and subcutis.

Findings:

• Immunohistochemistry confirmed the presence of kappa and lambda light chains.
• Electron microscopy identified typical amyloid fibrils (7-10 nm in diameter).
• Crucially, there was no evidence of systemic amyloidosis, paraproteinemia, or underlying plasmacytoma, indicating a localized form.

Implications:

• The findings suggest localized cutaneous amyloidosis as a distinct clinicopathological entity.
• Complete surgical removal via curettage resulted in a favorable outcome with no relapse.
• This case underscores the importance of differentiating localized amyloidosis from systemic disease for appropriate patient management.