Mucocutaneous manifestations in systemic amyloidosis A retrospective analytical study in a tertiary care center.

Background: The mucocutaneous clinical profile of patients with amyloidosis in Latin America has been scarcely reported.
Objective: To describe clinical characteristics of skin and mucosal manifestations in systemic amyloidosis in a tertiary care center in Mexico City.
Methods: A cross sectional, retrospective analytical study was performed in patients with systemic amyloidosis over a 15-year period. Statistical analysis was done.
Results: A total of 98 patients were included (53 [54%] men; overall median age = 49 years old). Acquired systemic immunoglobulin light chain amyloidosis (AL) was the most common (49%) type, followed by (24.5%) wild-type transthyretin amyloidosis (H-TTR) (24.5%), undetermined cases (21%), and reactive systemic amyloidosis (AA) (6.1%). There were mucocutaneous manifestations in 34.7% of cases, mostly multiple myeloma-related AL (ALMM). Head and neck was the most often affected site (38.2%), and purpuric macules were the most common morphology (44.1%). Mucocutaneous affectation was predominantly observed in AL (50.0%) compared to other types (20.0%) of amyloidosis (P = 0.01). Likewise, involvement of organs was also significantly different among the diverse amyloidosis types (P < 0.05). The most frequent comorbidities were hypertension (18.3%) and hypothyroidism (18.3%).
Conclusion: The clinical spectrum of manifestations in amyloidosis is wide. Involvement of skin and mucosa in amyloidosis is common; significant differences were observed concerning distribution of mucocutaneous amyloid manifestations among the different types of amyloidosis.
(© 2019 The International Society of Dermatology.)