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Proliferating trichilemmal cyst with focal calcification
Robert Anolik1, Bahar Firoz, Ruth F Walters
1Department of Dermatology, New York University, USA.
Dermatology Online Journal
|December 9, 2008
Summary
A slow-growing scalp tumor was diagnosed as a ruptured proliferating trichilemmal cyst. Complete excision is recommended due to potential for aggressive behavior and malignant transformation.
Area of Science:
- Dermatology
- Pathology
Background:
- Proliferating trichilemmal cysts (PTCs) are rare cutaneous neoplasms.
- While typically benign, PTCs can exhibit locally aggressive behavior and rarely undergo malignant transformation.
Observation:
- A 64-year-old man presented with a large (4 x 5 x 6 cm), slow-growing, asymptomatic scalp tumor present for 30 years.
- The tumor exhibited recent accelerated growth, causing pain and discomfort, prompting medical evaluation.
- Physical examination revealed a mobile, rubbery, skin-colored, nearly hairless nodule on the left posterior scalp.
Findings:
- Biopsy confirmed a ruptured proliferating trichilemmal cyst with focal calcification.
- The lesion's long duration and recent growth pattern are notable.
Implications:
- Complete surgical excision is the recommended treatment for all benign proliferating trichilemmal cysts.
- Early diagnosis and intervention are crucial to prevent potential local aggression and malignant transformation.
- This case highlights the importance of monitoring and treating even slow-growing cutaneous lesions.
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