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.
Department of Orthopaedic Surgery, Faculty of Medicine, The University of Tokyo, Japan.
T
T
Ogata
S
S
Tanaka
T
T
Goto
T
T
Iijima
H
H
Kawano
M
M
Sasaki
T
T
Ishida
K
K
Nakamura
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*