Archives: Glossary

A nodule is a small, discrete lesion or abnormality, typically less than 10 millimeters in diameter, visible on ultrasound.

Nodal metastasis refers to cancer spread to lymph nodes, visible on ultrasound as enlarged or abnormal-appearing lymph nodes.

Newborn screening refers to the use of ultrasound in newborn infants to detect congenital abnormalities and disease.

A neuroma is a benign tumor of nerve tissue that can occur in various locations, including common sites like the interdigital space of the foot.

Neurofibromatosis is a genetic disorder characterized by the development of neurofibromas (tumors of nerve tissue), visible as soft tissue masses on ultrasound.

A neuroblastoma is a malignant tumor of neural crest origin, most commonly arising in the adrenal gland, visible as a renal or suprarenal mass on ultrasound.

Neural tube defects are congenital malformations of the brain or spinal cord resulting from failure of the neural tube to close during fetal development.

Nerves are bundles of nerve fibers visible on high-resolution ultrasound, particularly during musculoskeletal and peripheral nerve examination.

Nephrotic syndrome is characterized by severe proteinuria and reduced serum proteins, with ultrasound used to evaluate kidney size and echogenicity.

Nephroptosis is abnormal mobility or descent of the kidney, potentially visible on ultrasound when the patient changes position.