PMC3379739_01
X-ray. Two 4-mm, radio-opaque masses (arrow) can be visualized alongside the volar and radial aspect of the head of the right first metacarpal bone. No acute fracture is noted.
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F1
X-rays of the digit revealed radio-opaque masses around the volar aspect of MP joint consistent with synovial chondromatosis without evidence of acute fracture (Fig 1).
Computed tomography. Foci of mineralization (arrow) are again seen located adjacent to the volar and radial aspect of the right first metacarpophalangeal joint. Based on the x-ray and CT images, a radiographic diagnosis of synovial chondromatosis was suggested.
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F2
CT scan of the hand was obtained. Consistent with the initial x-rays, foci of mineralization adjacent to the thumb MP joint were noted (Fig 2).
Intraoperative aspect. Firm, irregularly shaped masses adjacent to but not penetrating the metacarpophalangeal joint capsule are visualized (arrows).
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F3
Deeper dissection revealed multiple firm, irregularly shaped masses adjacent to but not penetrating the MP joint capsule (Fig 3).
H & E staining of excised masses. The purple granules (arrows) were determined to be result of tumoral calcium phosphate deposition disease (calcinosis).
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F4
Histological examination of the resected specimen confirmed that the excised masses resulted from calcium phosphate deposition (Fig 4).