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Follicular Infundibulum Tumor

Background

Tumor of the follicular infundibulum is a rare benign adnexal tumor arising from the follicular infundibulum. The histopathology of the tumor is distinctive, which occurs as a platelike dermal nodule with multiple thin connections to the overlying epidermis (see the images below). The tumor usually manifests as a single lesion, but an eruptive (multiple) form may occur.

Tumor of the follicular infundibulum shows a plate

Tumor of the follicular infundibulum shows a platelike dermal tumor with anastomosing islands and cords with connections to the overlying epidermis and horn cysts (hematoxylin and eosin stain, 40X magnification).

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Tumor of the follicular infundibulum shows epiderm

Tumor of the follicular infundibulum shows epidermal connections, horn cysts, and anastomosing islands (hematoxylin and eosin stain, 100X magnification).

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Tumor of the follicular infundibulum shows epiderm

Tumor of the follicular infundibulum shows epidermal connections, peripheral palisading, and horn cyst (hematoxylin and eosin stain, 400X magnification).

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