PMC5509176_01
(A) A fleshy movable red tumor over the lower back. (B) Gross surgical specimen has a polycystic, reddish brown, hemorrhagic cut surface.
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F1
Her physical examination demonstrated a round, movable, solid mass over the lower back, about 8 cm x 7 cm at its largest diameter (Fig. 1A). The specimen included a grayish white calcified tumor and a 9 cm x 6-cm piece of attached skin (Fig. 1B).
(A) An ill-defined infiltrating tumor involving the dermis (hematoxylin and eosin 40x). (B) It has pleomorphic osteoblasts with osteoid formation (hematoxylin and eosin 400 x).
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F2
The histological examination revealed an ill-defined tumor involving the dermis (Fig. 2A) and subcutis, which was composed of atypical spindle, epithelioid, or pleomorphic cells surrounded by prominent osteoid (Fig. 2B) and bone formation.