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Macular amyloidosis with widespread diffuse pigmentation

C K Wang1, J Y Lee

  • 1Department of Dermatology, National Cheng Kung University Medical Center, Tainan, Taiwan, Republic of China.

The British Journal of Dermatology
|July 1, 1996
PubMed
Summary

This study describes a rare form of macular amyloidosis presenting as widespread skin hyperpigmentation without typical features. Early diagnosis is crucial to differentiate it from other conditions.

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Area of Science:

  • Dermatology
  • Pathology
  • Medical Research

Background:

  • Macular amyloidosis is a skin condition characterized by amyloid deposition in the dermis.
  • Typical presentations include rippled patterns, papules, and poikiloderma, often on the trunk.
  • Differential diagnosis includes various causes of hyperpigmentation, such as endocrine disorders and drug reactions.

Observation:

  • Two patients presented with an unusual variant of macular amyloidosis.
  • Lesions featured diffuse, homogeneous hyperpigmentation without papules, rippled patterns, or poikiloderma.
  • Hyperpigmentation was extensive, affecting the face, neck, mucosa, axillae, groin, and peripheries in one patient, and the face and arms in the other.

Findings:

  • Skin biopsies confirmed subepidermal, band-like amyloid deposits in both cases.

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  • Neither patient exhibited signs of systemic amyloid involvement.
  • Histopathological findings confirmed the diagnosis of amyloidosis despite the atypical clinical presentation.

    • Implications:

    • This unusual variant of macular amyloidosis can be misdiagnosed due to its atypical presentation.
    • Awareness of this variant is important for accurate diagnosis and appropriate patient management.
    • Further research may elucidate the specific mechanisms underlying this distinct clinical phenotype of amyloidosis.