Case Number : Case 811 - 26th July Posted By: Guest

Proliferating trichilemmal tumour as a response to foreign body material

I think the foreign material seen in this proliferating trichilemmal tumor is simply calciym deposited in the necrotic cornified center of some tumor lobules.

malignant proliferating tricholemmal tumor with dystrophic or metaplastic calcification.

Proliferating tricholemmal tumor with dystrophic calcification.

[quote name='Robledo F. Rocha' timestamp='1374840999']
Proliferating tricholemmal tumor with dystrophic calcification.
[/quote]
Agree with this differential.......Though we are not seeing the entire/ silhouette of the lesion and this could be part of a follicular SCC?

Proliferating trichilemmal cyst ( pilar tumor)

Wanted to give you a low power - don't seem to be able to just paste in an image. Have sent a couple more images to Iskander to add and will await further comments.

[size=4]I agree with several of the above: [/size][b] Proliferating trichilemmal cyst/tumor.[/b]
1. Few normal mitotic figures, ( if we are being shown the worst of it ).
2. Low-grade pseudocarcinomatous bosselated architecture, and low grade cytologic atypia with reactive features including squamous eddies.
3. The presence of extensive central dystrophic calcification (common in these lesions) and clinical history is helpful...consistent with a lesion that has been around for a long time without being obvious to the patient. (The hairdresser was the one to note it). A malignant pilar tumor would be more likely to have faster growth and not be so indolent, calcified and well circumscribed as this lesion.

[b]
Verrucous carcinoma of the scalp[/b]

Proliferating trichilemmal cyst/carcinoma

[color=#1C2837][font=arial, verdana, tahoma, sans-serif][size=4]Proliferating trichilemmal tumour [/size][/font][/color]

Proliferating pilar/trichilemmal tumor.

I put this in as a nice example of a proliferating pilar tumour