Case Number : Case 2000 - 05 Feb 2018 Posted By: Limin Yu

Strands of basaloid cells with few horn cysts and fibrotic stroma- desmoplastic trichoepithelioma.

Anastomosing marrow strands parallel to the epidermis and with outer sheath differentiation make me think of Follicular Infundibulum Tumor. 

Thanks Vincenzo. Now I see the plate- like growth and slightly pale staining cells. I was wrong. It is a tumour of the follicular infundibulum. As they say....the eyes don't see what the mind doesn't know!

You’re welcome Anil. And thank you for your very useful  comments in this and other cases. 

Akerman pointed out the tumours cells in this lesion are isthmic (plump & pink)!

Happy bi-millennium Spot Diagnosis!  I was hoping it would have been one of mine though.

I'm fortunate to be bi-millennium Spot Diagnosis!  Hats off to all contributors and participants. Together we make this forum better. 

This case is a Tumor of the Follicular Infundibulum. The plate-like growth is characteristic. 

14 hours ago, Dr. Richard Carr said:

Happy bi-millennium Spot Diagnosis!  I was hoping it would have been one of mine though.

Beautiful demonstration of a rare entity!