title: A plaque-type solitary reticulohistiocytoma in a two-year-old boy.
abstract: Reticulohistiocytoma (RH) is a dermal histiocytic infiltration composed of large histiocytes with eosinophilic glassy cytoplasm. RH is classified into three clinical forms: solitary RH, diffuse cutaneous RH without systemic involvement and multicentric reticulohistiocytosis with systemic diseases. Solitary RH generally manifests as a nodular lesion in adults without accompanying systemic diseases. Herein, we describe a case of solitary RH with an atypical clinical manifestation as a red-brown-colored plaque in a 2-year-old boy. Atypical presentations of RH may pose diagnostic difficulty unless RH is considered. A correct diagnosis of RH can ensure avoidance of unnecessary invasive procedures.
authors.affiliation: Department of Dermatology, Kyoto University Graduate School of Medicine, Kyoto, Japan.
authors.forename: Rintaro
authors.initials: R
authors.lastname: Shibuya
authors.affiliation: Department of Dermatology, Kyoto University Graduate School of Medicine, Kyoto, Japan ; Department of Dermatology, Nagahama Red Cross Hospital, Nagahama, Japan.
authors.forename: Hideaki
authors.initials: H
authors.lastname: Tanizaki
authors.affiliation: Department of Dermatology, Nagahama Red Cross Hospital, Nagahama, Japan.
authors.forename: Yo
authors.initials: Y
authors.lastname: Kaku
authors.affiliation: Department of Dermatology, Nagahama Red Cross Hospital, Nagahama, Japan.
authors.forename: Masao
authors.initials: M
authors.lastname: Yonezawa
authors.affiliation: Department of Dermatology, Kyoto University Graduate School of Medicine, Kyoto, Japan ; Department of Dermatology, Nagahama Red Cross Hospital, Nagahama, Japan.
authors.forename: Yuri
authors.initials: Y
authors.lastname: Ryu
authors.affiliation: Department of Dermatology, Kyoto University Graduate School of Medicine, Kyoto, Japan.
authors.forename: Atsushi
authors.initials: A
authors.lastname: Otsuka
authors.affiliation: Department of Dermatology, Kyoto University Graduate School of Medicine, Kyoto, Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Kabashima
authors.affiliation: Department of Dermatology, Kyoto University Graduate School of Medicine, Kyoto, Japan.
authors.forename: Yoshiki
authors.initials: Y
authors.lastname: Miyachi
keywords: Juvenile xanthogranuloma; Reticulohistiocytoma; Solitary plaque