Currently, mammography is the most effective method for an early diagnosis of breast cancer. In 85% to 90% of the cases, a high quality mammography allows the visualization of a tumor more than two years before the occurrence of lymph nodes involvement in women over 50 years of age. The radiological appearance of a normal and a sick tissue is very similar, therefore, a high quality of the scan is essential to obtain high contrast resolution to allow distinguishing them. Strict and preestablished protocols must be followed during mammography in order to reach high quality standards. Artifacts are defects occurred during film processing that interfere in the quality of the final image and can result in loss or masked information. Several types of artifacts from different sources can occur during image acquisition. These can be caused by the processor, the radiology technician, the mammography unit or the patient, and all result in degradation of the image acquired. The aim of this study is to review the effective methods that can be used in the quality control of mammography and to analyze the most important artifacts occurring in the daily practice, showing illustrations and suggestions on how to avoid them.

Keywords: Breast cancer, Breast radiology, Artifact

We report a case of 35 year-old male patient presenting with a mass in the left breast. After conventional imaging examinations the patient was submitted to a biopsy, which showed folliculosebaceous cystic ham-artoma. The authors present a brief review of the literature on this rare lesion in the male breast and its differential diagnosis with malignant masses.

Keywords: Folliculosebaceous cystic hamartoma, Breast, Male, Review

Poland's syndrome is a congenital pathology characterized by unilateral chest wall hypoplasia or aplasia and ipsilateral hand abnormalities. The authors report a case report of a female patient presenting without changes on physical examination, and show the correlated imaging findings (mammography and magnetic resonance imaging) of this rare condition.

Keywords: Poland's syndrome, Chest wall deformities, Mammography, Magnetic resonance imaging

Computed tomography is currently the method of choice for the diagnosis and staging of lymphomas. Computed tomography enables accurate measurement of both tumor extent and volume and provides information that can be used to plan an appropriate strategy for the treatment. The purpose of the present article is to describe and analyze the chest and abdomen computed tomography and ultrasound findings in HIV-negative patients with lymphoma. Clinical abnormalities, such as the reason the patient sought medical assistance already showing evidence of lymphocytic disease (not yet diagnosed at this point) and the physical examination abnormalities seen on the first consultation were also studied. This study comprised 30 patients: 40% with non-Hodgkin lymphoma, 46.6% with Hodgkin lymphoma, 10% with Burkitt's lymphoma and 3.3% with lymphoblastic lymphoma.

Keywords: Lymphoma, Computed tomography, Ultrasonography