"Giant" senile sebaceous hyperplasia.

Area of Science:

• Dermatology
• Pathology

Background:

• Senile sebaceous hyperplasia typically presents as small, 2-3 mm nodules.
• These benign growths involve mature sebaceous glands.

Observation:

• A 75-year-old Japanese man presented with a giant (10 mm) nodule on his cheek.
• The lesion was dome-shaped, skin-colored, and featured multiple umbilications.
• Smaller, yellow papules with central umbilication were also present.

Findings:

• Histological examination revealed a sharply demarcated hyperplasia of grouped mature sebaceous glands.
• A converging sebaceous duct opening to the surface corresponded to the clinical umbilication.
• The giant nodule and smaller papules shared the same histological architecture.

Implications:

• This case highlights the potential for unusually large presentations of senile sebaceous hyperplasia.
• The benign nature of the growth was confirmed despite its extraordinary size.
• Understanding the factors contributing to giant sebaceous hyperplasia warrants further investigation.