Giant trichoblastoma mimicking malignancy.
We report a case of giant trichoblastoma, a rare benign hair germ tumor. A 73-year-old man presented with a soft-tissue mass on his upper arm. Magnetic resonance imaging analysis revealed an unique mosaic pattern on T2-weighted images. Needle biopsy disclosed a keratinizing tumor suggesting squamous cell carcinoma. The size of the tumor was 9.5 x 7 x 9.5 cm, one of the largest trichoblastomas ever reported. The rarity and gigantic size of the tumor, together with its misleading clinical features, prompted us to report our case.
Ogata
T
T
Department of Orthopaedic Surgery, Faculty of Medicine, The University of Tokyo, Japan.
Tanaka
S
S
Goto
T
T
Iijima
T
T
Kawano
H
H
Sasaki
M
M
Ishida
T
T
Nakamura
K
K
D000368:Aged; D001132:Arm; D002277:Carcinoma / Q000000981:diagnostic imaging / Q000473:pathology*; D018859:Hair Follicle; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D011859:Radiography; D012983:Soft Tissue Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology*