CT findings of retroperitoneal malignant mesenchymoma.

Malignant mesenchymoma (MM) is a rare mesenchymal neoplasm which, by definition, demonstrates at least two distinct types of malignant mesenchymal differentiation. We present the computed tomographic (CT) findings of a 42-year-old female with a pathologically proven retroperitoneal MM consisting of osteoid production combined with foci of liposarcoma and Kaposi sarcoma. MM should be considered along with extraosseous osteosarcoma and teratoma in the differential diagnosis for unusual large heterogeneous retroperitoneal masses with massive calcification.

Metastatic cervical carcinoma to the breast.

Metastatic disease to the breast is often an unexpected diagnosis in a female who presents with a breast mass. The most important factor suggesting the appropriate diagnosis is a history of cancer. Correlation of mammographic and ultrasonographic findings may also raise the possibility of a metastatic mass.

Renal peripelvic lymphatic cysts (lymphangiomas) associated with generalized lymphangiomatosis.

Renal peripelvic lymphatic cysts (lymphangiomas) are usually seen as an isolated finding. They appear as multiple mass lesions with low attenuation on computed tomography (CT), and show no contrast enhancement. We present a case of renal peripelvic lymphatic cysts associated with generalized lymphangiomatosis, and examined with magnetic resonance imaging (MRI), CT, and lymphangiography.

MR imaging of colonic lipoma.

Colonic lipomas may present with symptoms similar to colonic malignancies but require a much less aggressive surgical approach to control the symptoms and provide a cure. This case illustrates the efficacy and advantages of MR, using a barium sulfate enema in noninvasive, preoperative diagnosis of a colonic lipoma, thus facilitating appropriate management of the patient.