Which condition could result in the need for a sonogram?

A sonogram, also known as an ultrasound, is a diagnostic imaging technique that uses high-frequency sound waves to create images of organs and structures inside the body. This method is particularly useful for assessing the internal organs because it provides real-time images, allowing for the evaluation of conditions affecting organs such as the liver, kidneys, gallbladder, pancreas, and reproductive organs.

When considering the context of the other conditions listed, a broken bone typically requires X-rays for diagnosis, as they provide a clearer view of bone structure. Appendicitis may be evaluated with a sonogram, but it is usually diagnosed primarily through clinical examination and may be confirmed with a CT scan. A skin rash is assessed through physical examination and does not require imaging techniques like a sonogram. Therefore, among the given options, the assessment of internal organs is clearly the most appropriate indication for the use of ultrasound, making it the correct choice.