Which of the following conditions can be diagnosed via abdominal ultrasound?

Abdominal ultrasound is a versatile imaging modality that can effectively diagnose a range of conditions within the abdomen. When considering the ability to diagnose hernias and appendicitis, ultrasound can be particularly useful in identifying abnormal bulging of tissue through the abdominal wall and visualizing the appendix, helping to discern whether it is inflamed or otherwise affected.

In terms of tumors, ultrasound is capable of detecting both benign and malignant masses by assessing their characteristics, size, and location. This helps in forming an initial impression before potentially proceeding to further diagnostic steps such as CT or MRI for detailed evaluation.

Fluid collections, such as abscesses, are commonly identified through ultrasound imaging. The modality excels in detecting these fluid-filled spaces and can help differentiate them from solid masses.

Given its effectiveness in diagnosing all these conditions, the conclusion that all of the presented conditions can be evaluated through abdominal ultrasound is accurate. Thus, the choice that encompasses all these diagnoses reflects the broad capabilities of ultrasound in clinical practice.