title: Intramuscular metastasis from malignant melanoma: MR findings.
abstract: We present a rare case of intramuscular metastasis from malignant melanoma. The lesion showed intermediate to high signal intensity on T1-weighted magnetic resonance (MR) images and mixed signal intensities containing high and low signals on T2-weighted images. The signal intensity on T1-weighted images, which is due to the paramagnetic effect of melanin, is a characteristic MR finding of this entity.
authors.affiliation: Department of Radiology, Institute of Clinical Medicine, University of Tsukuba, Ibaraki, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Yoshioka
authors.forename: Y
authors.initials: Y
authors.lastname: Itai
authors.forename: M
authors.initials: M
authors.lastname: Niitsu
authors.forename: M
authors.initials: M
authors.lastname: Fujiwara
authors.forename: T
authors.initials: T
authors.lastname: Watanabe
authors.forename: H
authors.initials: H
authors.lastname: Satomi
authors.forename: F
authors.initials: F
authors.lastname: Otsuka
mesh_terms: D006801:Humans; D008207:Lymphatic Metastasis; D008279:Magnetic Resonance Imaging; D008297:Male; D008545:Melanoma / Q000175:diagnosis* / Q000473:pathology / Q000556:secondary*; D008875:Middle Aged; D019042:Muscle Neoplasms / Q000175:diagnosis* / Q000473:pathology / Q000556:secondary*; D012878:Skin Neoplasms / Q000473:pathology*; D013848:Thigh