Sebaceous adenoma
From Felipedia
Feline sebaceous adenomas are a benign tumor characterized by a preponderance of sebocytes (cells with intracytoplasmic lipid vacuoles) with few basaloid cells and ducts.
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Gross Appearance
- Elevated mass with extensive intradermal component
- Vary in size from 0.1-0.5 cm in diameter
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Histology
- Well demarcated intradermal mass
- May extend from the dermo-epidermal interface to the subcutis, replacing the normal tissue
- Forms discrete lobules, which vary in size
- May have remnants of dermal collagen within the tumor
- Variable numbers of basaloid reserve cells and sebocytes
- Basaloid reserve cells at the periphery of the lobules are from one to several layers in thickness
- Sebocytes predominate within the tumor
- Small or larger ducts, often lined by a brightly eosinophilic corrugated squamous epithelium, are often present
- Neoplastic lobues are not arranged around a distended duct as is found with sebaceous hyperplasia
