👉 Oligocystic megacysts (OMC) are a condition in which there is an accumulation of small, white cysts in the kidneys. These cysts can be caused by a variety of factors, including infections or exposure to certain substances. OMC is most commonly diagnosed in children and adults with conditions such as diabetes insipidus, where it can lead to dehydration and kidney failure. The cause of OMC is unknown, but it may be related to the immune system's