Related Experiment Videos
Benign sebaceous neoplasm with prominent epidermal component
M Toyoda1, T Shoji, M Morohashi
1Department of Dermatology, Faculty of Medicine, Toyama Medical and Pharmaceutical University, Japan.
Insights
This study describes a rare case of intraepidermal epithelioma with extensive sebaceous differentiation. This finding expands the understanding of cutaneous neoplasms and their varied differentiation patterns.
Area of Science:
- Dermatopathology
- Oncology
Background:
- Cutaneous neoplasms can exhibit intraepidermal growth patterns.
- Sebaceous differentiation is a feature observed in various skin tumors.
Observation:
- A solitary nodule within an erythematous plaque in a 65-year-old woman's groin was examined.
- Histopathology revealed basaloid cells with sebaceous elements and an extensive intraepidermal component of mature sebocytes.
Findings:
- The case presented as intraepidermal epithelioma with significant sebaceous differentiation and focal invasion.
- Electron microscopy indicated basaloid cells with pluripotential features.
- Extensive sebaceous differentiation in this context is a previously undescribed phenomenon.
Implications:
- This case supports the concept of intraepidermal epithelioma as a heterogeneous group of tumors with diverse differentiation.
- Sebaceous epithelioma/adenoma should be considered in the differential diagnosis of intraepidermal cutaneous neoplasms.
Abstract:
A 65-year-old woman presented with a solitary nodule within an erythematous plaque in her right groin. Histopathologic examination showed central lobular proliferation of basaloid cells admixed with mature sebaceous cells and a lateral extensive intraepidermal component composed mostly of lobules of mature sebocytes consistent with intraepidermal epithelioma with sebaceous differentiation and focal invasion. Although various cutaneous neoplasms may show an intraepidermal growth pattern, extensive sebaceous differentiation in such a neoplasm, as seen in this case, has not been described. Electron-microscopic study revealed that the basaloid cells have features of pluripotential cells. This observation supports the previously reported concept that intraepidermal epithelioma may be composed of a group of heterogeneous tumors with various degrees and lines of differentiation. Additionally, sebaceous epithelioma/adenoma should be considered in the differential diagnosis of the cutaneous neoplasms with an intraepidermal growth pattern.