title: Papillary endothelial hyperplasia and dilated lymphatic vessels in bullous pilomatricoma.
abstract: This is a report of papillary endothelial hyperplasia in a 9-year-old girl with a pilomatricoma showing bullous appearance. Histologically, papillary proliferation of endothelial cells was found within dilated lymphatic endothelium-lined vascular channels overlying a pilomatricoma. The endothelial cells covering the papillae were of a lymphatic endothelial cell nature proved by immunohistochemistry and electron microscopy. Abundant fibrous long-spacing collagen was observed in the connective tissue and fibroblasts within papillae.
authors.affiliation: Departments of Dermatology, Affiliated Second Hospital, Zhejiang University School of Medicine, Hangzhou 310009, China. laolimin@yahoo.com
authors.forename: Li-Min
authors.initials: LM
authors.lastname: Lao
authors.forename: Masanobu
authors.initials: M
authors.lastname: Kumakiri
authors.forename: Takahiro
authors.initials: T
authors.lastname: Kiyohara
authors.forename: Keiko
authors.initials: K
authors.lastname: Sakata
authors.forename: Akiteru
authors.initials: A
authors.lastname: Takeuchi
mesh_terms: D002648:Child; D003937:Diagnosis, Differential; D004727:Endothelium / Q000473:pathology; D005260:Female; D006201:Hair Diseases / Q000175:diagnosis* / Q000473:pathology; D006801:Humans; D042601:Lymphatic Vessels / Q000473:pathology; D018296:Pilomatrixoma / Q000175:diagnosis* / Q000473:pathology; D012540:Scapula; D012878:Skin Neoplasms / Q000175:diagnosis* / Q000473:pathology