Which of the following is the most common primary orbital malignancy and is a type of sarcoma?

Rhabdomyosarcoma is recognized as the most common primary orbital malignancy, particularly in children, and it is classified as a type of soft tissue sarcoma. This malignancy arises from mesenchymal cells, which are the progenitors of muscle and connective tissues. In the context of orbital tumors, rhabdomyosarcoma can manifest as a rapidly growing mass that may lead to symptoms such as proptosis, diplopia, or visual disturbances, depending on the structures it affects.

The prevalence and aggressive nature of rhabdomyosarcoma make it a significant concern in pediatric oncology, especially when it occurs in the orbit, an area that can affect both visual function and overall cranial development. Early diagnosis and intervention are pivotal in managing this tumor effectively, as the treatment often involves a combination of chemotherapy, radiation, and possibly surgery.

Osteosarcoma and fibrosarcoma, while also types of sarcomas, are less commonly found in the orbit compared to rhabdomyosarcoma. Neuroblastoma, although a malignant tumor that can occur in children and has a notable presence in the abdomen and adrenal glands, is not classified as a primary orbital malignancy. As such, rhabdomyosarcoma