title: Severe erosive lichen planus and polycythemia vera in an adolescent.
abstract: Erosive lichen planus developed in a 12-year-old adolescent also presenting polycythemia vera (Vaquez' disease). Though a casual association cannot be excluded, the rarity of the two diseases in children suggests a pathogenetic link, possibly involving an abnormal hematologic stem cell line.
mesh_terms: D001706:Biopsy; D001853:Bone Marrow / Q000473:pathology; D002648:Child; D005148:Facial Dermatoses / Q000473:pathology; D006801:Humans; D008010:Lichen Planus / Q000473:pathology*; D008297:Male; D009059:Mouth Diseases / Q000473:pathology; D011087:Polycythemia Vera / Q000473:pathology*; D012867:Skin / Q000473:pathology; D014059:Tongue / Q000473:pathology; D014060:Tongue Diseases / Q000473:pathology