Isoechoic refers to moderate echogenicity and is commonly found in parenchymal organs such as the liver and spleen. In the case of a solid occupying mass, the echo of the mass is consistent with its surrounding background and can also be described as an isoechoic mass. Echo grades are categorized as anechoic, hypoechoic, isoechoic, hyperechoic, and hyperechoic. The strength of the echoes is compared to the surrounding tissue. When an isoecho is detected during an ultrasound examination, it means that abnormal tissue is found that echoes with the surrounding tissue, such as isoechoic nodules found in the thyroid gland, which are compared to the thyroid tissue. In addition to determining the nature of the abnormal site based on the strength of the echoes, ultrasonography is also based on the morphology of the tissue, boundaries, blood flow, etc. Anechoic, which is the absence of reflection, is common in pure fluids such as bile, blood, and urine. Hypoechoic, commonly found in subcutaneous fat, and isoechoic, commonly found in parenchymal organs such as the liver and spleen. Hypoechoic, commonly seen in structures with many fibrous components such as blood vessel walls, heart valves, and organ envelopes. Strong echoes are seen in calcification, bone surface and gas reflection. Patients are advised to consult their specialists for details of the ultrasound report.