What does urinary bladder distended with anechoic lumen means?

A urinary bladder distended with anechoic lumen indicates that the bladder is filled with clear, fluid (urine) and is likely enlarged. The term "anechoic" refers to the absence of internal echoes on an ultrasound image, suggesting that the lumen is filled with a homogenous liquid rather than any solid or complex materials. This condition can occur due to overhydration, urinary retention, or obstruction. It is important for medical professionals to assess the underlying cause and the patient's overall urinary function.