BACKGROUND Ancient schwannomas are degenerate peripheral nerve sheath tumors that very rarely occur in the retroperitoneum. They generally reach large proportions before producing symptoms due to mass effect. We describe three cases of retroperitoneal ancient schwannomas and discuss the diagnosis and management of these tumors. CASE PRESENTATIONS Three female patients with retroperitoneal anc...

Testicular teratomas may present in both prepubertal and adult males. The prognosis differs greatly between these two groups. In children, teratomas most often occur before the age of four. They are seen in their pure form, and behave a benign behavior. In adults, teratomas are usually part of a mixed GCTs, and have the potential to metastasize. The presence of neck metastasis in patients with ...

Dedifferentiated liposarcomas may display a variety of "heterologous" lines of differentiation, including osseous, vascular, skeletal, and/or smooth muscular. There have been six previously reported examples of leiomyosarcomas associated with high levels of serum human chorionic gonadotropin (hCG) production, comprised of cases originating from the retroperitoneum, spermatic cord, small intesti...

We report an extremely rare case of recurrent ascending colon cancer manifesting as inferior vena cava (IVC) thrombus. A 77-year-old woman previously diagnosed with ascending colon cancer underwent right hemicolectomy with lymph node dissection. Though the tumor invaded the retroperitoneum and involved the right ovarian artery and vein, curative operation was performed. The patient took 5-FU p....