• Arch Orthop Trauma Surg · Jan 1999

    Review Case Reports

    Giant trichoblastoma mimicking malignancy.

    • T Ogata, S Tanaka, T Goto, T Iijima, H Kawano, M Sasaki, T Ishida, and K Nakamura.
    • Department of Orthopaedic Surgery, Faculty of Medicine, The University of Tokyo, Japan.
    • Arch Orthop Trauma Surg. 1999 Jan 1; 119 (3-4): 225-7.

    AbstractWe 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.

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