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Dr Sampurna Roy
MD
 Site created by Dr Sampurna Roy MD
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Benign sweat gland tumours Cysts: Hydrocystoma -Eccrine/Apocrine Porokeratotic eccrine ostial naevus Benign Neoplasms: Syringocystadenoma Papilliferum Chondroid Syringoma (benign mixed tumour) Low grade: Primary extramammary Paget’s disease Intermediate grade: Digital papillary adenocarcinoma High grade: |
| Tumour
of the follicular infundibulum (TFI) is a simple follicular
acanthoma with characteristic histopathologic features. Classified as: (1) solitary tumours, (2) eruptive tumours, (3) TFI - associated with other lesions of Cowden's disease, (4) TFI- associated with a single tumour such as nevus sebaceus, and (5) TFI-like epidermal changes. Clinically presents as a small asymptomatic, smooth or slightly keratotic papule or plaque. Sites: Head and neck or upper chest. Microscopic features: Symmetrical tumour with plate-like growth pattern of the squamous cells ( similar to isthmic or outer root sheath epithelium) parallel to the surface epithelium ; Multiple attachments to the epidermis ; Basal cell palisade ; Acanthotic epithelium eosinophilic and pale staining than the overlying epidermis ; Small ducts and microcavities with keratin in the lesion; PAS- positive basement membrane. Differential diagnosis: Inverted follicular keratoses ; trichilemmomas ; Plaque-like seborrheic keratosis ; Superficial basal cell carcinoma; Multiple infundibular tumors of the head and neck. |
Surgical-Pathology.com
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Tumours of the Hair Follicle Hair Germ Differentiation: Desmoplastic Trichoepithelioma
Cutaneous lymphadenoma Tumour of Follicular Infundibulum Outer root
sheath differentiation: Proliferating Trichilemmal Cyst (Pilar Tumour)
Matrical differentiation: |