title: Perivascular myoma of myopericytoma and myofibromatosis-type arising in a chronic scar.
abstract: We describe a case of a cutaneous perivascular myoma with features overlapping between the myofibromatosis and the myopericytoma type. The patient is a 58-year-old woman with a painless plaque-like and multinodular lesion in the pretibial dermis and subcutaneous tissue. She had repeated trauma to this site, first in her early youth that left an area of hyperpigmentation, and then again at age 40. The biopsy showed a biphasic pattern with a myofibromatosis-type component composed of spindle cell myoid nodules and more cellular round cell areas. The myopericytoma-like areas appeared to be infiltrating along vessels. These areas contained aggregates of immature-appearing cells arranged concentrically around vascular lumina in a manner reminiscent of pericytes. Immunohistochemical stains showed focal positivity for smooth muscle actin. Immunohistochemical and ultrastructural studies have showed these pericyte-like cells to be of a myoid origin. The reason for the neoplastic proliferation of perivascular myoid cells is presently unknown. The association of trauma and neoplastic transformation of the skin is rare. We report the first case of a cutaneous perivascular myoma arising in a chronic scar.
authors.affiliation: Department of Pathology, University of Texas Health Science Center at San Antonio, San Antonio, TX 78284-8850, USA. scottsjuve@uthscsa.edu
authors.forename: Rolf Sjuve
authors.initials: RS
authors.lastname: Scott
authors.forename: Kristie L
authors.initials: KL
authors.lastname: Blank
authors.forename: Liana H
authors.initials: LH
authors.lastname: Proffer
authors.forename: Eric W
authors.initials: EW
authors.lastname: Kraus
authors.forename: Josefine
authors.initials: J
authors.lastname: Heim-Hall
mesh_terms: D014408:Biomarkers, Tumor / Q000032:analysis; D002908:Chronic Disease; D002921:Cicatrix / Q000150:complications / Q000473:pathology*; D005260:Female; D006393:Hemangiopericytoma / Q000209:etiology / Q000473:pathology* / Q000601:surgery; D006801:Humans; D007124:Immunoenzyme Techniques; D008875:Middle Aged; D018224:Myofibromatosis / Q000209:etiology / Q000473:pathology* / Q000601:surgery; D009214:Myoma / Q000209:etiology / Q000473:pathology* / Q000601:surgery; D009383:Neoplasms, Vascular Tissue / Q000209:etiology / Q000473:pathology* / Q000601:surgery; D020286:Pericytes / Q000473:pathology; D012878:Skin Neoplasms / Q000209:etiology / Q000473:pathology* / Q000601:surgery; D016896:Treatment Outcome
chemical_list: D014408:Biomarkers, Tumor