[Histopathological aspects of tertiary pinta]

Area of Science:

• Dermatology
• Infectious Diseases
• Pathology

Background:

• Tertiary pinta is a late stage of a treponemal infection affecting indigenous populations.
• Achromic lesions are a characteristic manifestation of this stage.
• Understanding the histopathology is crucial for diagnosis and management.

Purpose of the Study:

• To investigate the histopathological features of achromic lesions in Tikuna Indians.
• To compare findings between treated and untreated individuals.

Main Methods:

• Biopsy samples from 22 Tikuna Indians with achromic lesions were analyzed.
• Ten subjects had received prior penicillin treatment.
• Histopathological examination focused on epidermal and dermal changes.

Main Results:

• Consistent histopathological findings were observed in all cases.
• Slight hyperkeratosis (86.36%) and acanthosis (18.18%) were common epidermal changes.
• Reduced basal layer melanin and perivascular lymphocyte infiltrate (88.18%) were universally present.
• No endothelial swelling was noted.

Conclusions:

• Histopathological examination of achromic pinta lesions shows consistent features.
• Prior penicillin treatment did not significantly alter the observed histopathological picture.