pilomatrixoma

pi·lo·ma·trix·o·ma

(pī'lō-mā'trik-sō'mă), [MIM*132600]
A benign solitary hair follicle tumor, often starting in childhood, containing cells resembling basal cell carcinoma and areas of epithelial necrosis forming eosinophilic ghost cells with variable calcification and foreign body giant cell reaction in the fibrous stroma.
[pilo- + matrix + G. -oma, tumor]

pilomatrixoma

/pi·lo·ma·trix·o·ma/ (-ma-trik´so-mah) a benign, circumscribed, calcifying epithelial neoplasm derived from hair matrix cells, manifested as a small, firm, intracutaneous spheroid mass, usually on the face, neck, or arms.

pi·lo·ma·trix·o·ma

(pī'lō-mā'trik-sō'mă)
A benign solitary hair follicle tumor containing cells resembling basal cell carcinoma and areas of epithelial necrosis.
Synonym(s): Malherbe calcifying epithelioma.
[pilo- + matrix + G. -oma, tumor]

Malherbe,

Albert, French physician, 1845-1915.
Malherbe calcifying epithelioma - a benign solitary hair follicle tumor. Synonym(s): Malherbe-Chenantais epithelioma; pilomatrixoma
Malherbe-Chenantais epithelioma - Synonym(s): Malherbe calcifying epithelioma

pilomatrixoma

a benign, circumscribed, calcifying epithelial neoplasm derived from hair matrix cells, manifested as a small firm intracutaneous spheroid mass. Kerry blue terriers have a predisposition to develop these. Called also epithelioma of Malherbe, calcifying epithelioma.
References in periodicals archive ?
First described by Malherbe in 1880 as a calcifying epithelioma, (1) the lesion would eventually be termed a pilomatricoma or pilomatrixoma.
Eccrine poroma, sebaceous hyperplasia, and pilomatrixoma were the most common benign tumors and two sebaceous carcinoma were the only two malignant tumors seen.
INTRODUCTION: Pilomatrixoma or Pilomatricoma is a relatively uncommon benign tumor that originates from the matrix cells at the base of the hair.
Among the differential diagnosis are lipoma, lipoblastoma, fibromatosis, cystic hygroma and pilomatrixoma.
An unusual presentation of giant pilomatrixoma in an adult patient.
Pilomatrixoma is a rare benign skin tumor arising from hair follicle stem cells which is also known as calcifying epithelioma of Malharbe.
Background and Design: Pilomatrixoma calcifying epithelioma of Malherbe is a rare, benign, limited, calcifying epithelial neoplasm that arises from the hair pluripotent precursor matrix cells.
Pilomatrixoma is a rare, benign, calcified, adnexial soft tissue tumor of the eyelid which originates from the matrix of hair follicle.
3) Later, the term pilomatrixoma was coined by Forbis and Helwig in 1961 and it was suggested that the cells of origin are the outer root sheath cells of the hair follicle.
Later this neoplasm was renamed pilomatrixoma or pilomatricoma to reflect its resemblance to cells of the hair follicle matrix [4].
The term pilomatrixoma was first used in 1961 by Forbis and Helwig, thus avoiding the word epithelioma, which carries the connotation of malignancy.
Pilomatrixoma is a slowly growing benign tumor of the dermal hair cells.