Papillary endothelial hyperplasia and dilated lymphatic vessels in bullous pilomatricoma.
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.
Lao
Li-Min
LM
Departments of Dermatology, Affiliated Second Hospital, Zhejiang University School of Medicine, Hangzhou 310009, China. laolimin@yahoo.com
Kumakiri
Masanobu
M
Kiyohara
Takahiro
T
Sakata
Keiko
K
Takeuchi
Akiteru
A
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