Pulmonary artery sarcomas are infrequently encountered and are often misdiagnosed before surgical exploration or autopsy. On clinical examination and conventional imaging studies, they are frequently mistaken for pulmonary emboli. To our knowledge, this case report is the first to describe the postoperative magnetic resonance imaging (MRI) appearance of residual disease of a pulmonary artery sarcoma and to assess the potential usefulness of MRI for monitoring such lesions postoperatively. Contrast-enhanced MRI, a relatively noninvasive method, seems well suited for postsurgical follow-up of pulmonary artery sarcomas.

We report 3 cases of simple epidermoid cyst of the testis. These tumors often are mistaken clinically for malignancy. Conservative surgical treatment with preservation of the testis is desirable when preoperative ultrasound reveals a well demarcated cystic nodule confirmed by histological frozen sections.

In patients with known fistulas, MRI may determine the lesion's anatomic extent, localize unsuspected fistulas, and confirm or exclude the inflammation of the fistulous tract(s). Information obtained by MRI examination may, in turn, be used to determine treatment of patients with perirectal inflammatory lesions and can be a useful adjunct in following results of therapy.