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Updated: Jul 23, 2026

Reverse Total Shoulder Arthroplasty
Published on: July 5, 2011
Parosteal fasciitis of the clavicle
T Yamamoto1, T Marui, K Mizuno
1Department of Orthopaedic Surgery, Kobe University School of Medicine, Kobe, Japan. yamatetu@med.kobe-u.ac.jp
Abstract:
A rare case of parosteal fasciitis arising from the periosteum of the left clavicle in a 27-year-old woman is reported. Magnetic resonance imaging demonstrated the lesion surrounding the periosteum of the clavicle. The lesion was iso-intense with muscle on T(1)-weighted images and hyperintense on T(2)-weighted images. At surgery, the lesion was discovered to be densely adherent with the periosteum, and excised along with the periosteum. Histopathological examination revealed the proliferation of myofibroblasts in a vague storiform or short fascicular pattern. A large amount of extravasated erythrocytes, and a few lymphocytes were present in the matrix. There were some foci of abundant myxoid materials. Immunohistochemical study showed the cells to be positive for vimentin, alpha-smooth muscle actin and HHF35, but negative for desmin. There was no local recurrence at a 6 months postoperative follow up.
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