PMC5266851_01
A palpable and tender mass, approximately 2.5 cm x 2.5 cm x 1.5 cm in diameter on the lateral aspect of the left thumb.
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On physical examination, the patient had a palpable and tender mass, approximately 2.5 cm x 2.5 cm x 1.5 cm in diameter, located over the dorsal aspect of the CM joint of the left thumb without involvement of the skin (Figure 1).
PA and lateral plain X-ray of the left hand showing a soft tissue lesion with calcifications adjacent to trapezium and the base of the first metacarpal bone.
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CM joint of the left thumb without erosion of the base of the first metacarpal bone and trapezium (Figure 2). Computed tomography (CT) imaging showed a 2.1 cm x 1.9 cm x 1.4 cm nodule (Figure 3).
(a) Preoperative CT imaging of the left hand showing a nodule (white arrow) adjacent to trapezium and the base of the first metacarpal bone. (b) Axial section of CT imaging showing the tumor (white arrow).
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CM joint of the left thumb without erosion of the base of the first metacarpal bone and trapezium (Figure 2). Computed tomography (CT) imaging showed a 2.1 cm x 1.9 cm x 1.4 cm nodule (Figure 3).
An intraoperative photograph showing marginal incision of the tumor.
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Marginal resection of the tumor with synovectomy was performed after the CM joint capsule was incised (Figures 4 and 5).
Gross pathological specimen of excised tumor.
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Marginal resection of the tumor with synovectomy was performed after the CM joint capsule was incised (Figures 4 and 5).
Histopathology of resected tumor showing cartilaginous tissue with calcification (hematoxylin and eosin stain x4).
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Pathology examination revealed fibrous tissue containing cartilaginous areas with calcification, which was consistent with SOC (Figure 6).