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Inverted follicular keratosis
1Department of Dermatology, Kaohsiung Medical University, No. 100, Shih-Chung 1 Rd., Kaohsiung, Taiwan.
The Kaohsiung Journal of Medical Sciences
|June 20, 2001
Summary
Inverted follicular keratosis (IFK), a benign skin lesion, can be mistaken for squamous cell carcinoma (SCC). Accurate pathological diagnosis is crucial to avoid unnecessary treatments for this non-cancerous condition.
Area of Science:
- Dermatopathology
- Oncology
Background:
- Inverted follicular keratosis (IFK) is a benign skin neoplasm.
- IFK can clinically and pathologically resemble malignant lesions, particularly squamous cell carcinoma (SCC).
Observation:
- A case of a 35-year-old male with a 3-month history of a solitary, exophytic, flesh-colored nodule on the nasal ala is presented.
- The lesion, measuring 5 mm, exhibited a papillary surface and tendency to bleed.
- Initial clinical diagnosis was pyogenic granuloma, leading to shave excision with cautery.
Findings:
- Histopathological examination revealed diagnostic challenges, with features suggestive of IFK including squamous eddy formation and absence of epithelial dysplasia.
- Human papillomavirus (HPV) DNA was not detected via PCR.
- The patient experienced satisfactory healing post-excision with no recurrence over 10 months.
Implications:
- Highlights the potential for misdiagnosis between IFK and SCC, emphasizing the need for careful histopathological evaluation.
- Underscores the risk of overtreatment for benign IFK if confused with malignant SCC.
- Accurate differentiation prevents disfiguring procedures for non-cancerous skin lesions.