A Simple Look-Up On Soft Tissue Osteoma: Report Of A Case.

摘要

Soft tissue tumors of the body represent wide variety. Osteoma is a benign, slow-growing osteogenic tumor that is primarily located in the maxillofacial region. However, soft tissue osteoma or osteoma cutis or extraskeletal osteoma is observed extremely rare. Here, we report a soft-tissue osteoma located on the dorsum of the body that had started and grown silently. The main complaint was the mass. Excisional biopsy was successfully carried out. After all, the pathological analysis consisted of osteoma within the cutis. Introduction Osteoma is an osteogenic benign tumor that can be central, peripheral or extraskeletal (1). Central osteomas arise from endosteum, peripheral osteomas arise from periosteum and extraskeletal soft-tissue osteomas usually develop within a muscle (2, 3). Cutaneous bone formation may be primary or secondary. If it is primary, there is no preceding cutaneous lesion or history; however, if it is secondary, bone forms through metaplasia within a preexisting lesion (4).An extraskeletal soft-tissue osteoma is observed exceedingly rare. The most common involvement of soft tissue osteomas is reported on the tongue and the skin (1, 5-8). Furthermore, the skin welcomes mostly the face and extremities (1, 5-10). Case Report An eighteen-year-old male patient applied with a non-traumatic, painless mass on his back. He had the mass for 4 years with no progressive grow-up. Everything was normal but, the palpation of the mass showed tenderness, tough and immobile 3x2 cm mass with sharp border. There was not a change on the color of the skin over the mass. The plain roentgenogram clearly showed the well circumscribed ossified lesion on the neighborhood of the T8 vertebra. The excisional biopsy was carried out via local anesthesia (Figure 1). No invasion was noted around, and the mass was easily excised within the subcutaneous fat. The specimen pointed out a grey-white color, rough firm and encapsulation, grossly (Figure 2).