title: Chronic expanding hematoma showing fluid-fluid level.
authors.affiliation: Department of Dermatology, Shiga University of Medical Science, Otsu, Shiga, Japan E-mail: noriki@belle.shiga-med.ac.jp.
authors.forename: Toshifumi
authors.initials: T
authors.lastname: Takahashi
authors.affiliation: Department of Dermatology, Shiga University of Medical Science, Otsu, Shiga, Japan E-mail: noriki@belle.shiga-med.ac.jp.
authors.forename: Noriki
authors.initials: N
authors.lastname: Fujimoto
authors.affiliation: Department of Dermatology, Shiga University of Medical Science, Otsu, Shiga, Japan E-mail: noriki@belle.shiga-med.ac.jp.
authors.forename: Toshihiro
authors.initials: T
authors.lastname: Tanaka