Hi @pamm and welcome to Connect. You may have noticed I changed the title of this thread to "Pneumatosis Cystoides Intestinalis" in order to make it easier for others searching for this condition to join in on the conversation.
According to an article in the World Journal of Gastroenterology, Pneumatosis Cystoides Intestinalis is defined as "a rare disease characterized by the presence of gaseous cysts containing nitrogen, hydrogen and carbon dioxide in the intestinal wall that may be iatrogenic[2-5] or associated with a wide variety of conditions" – https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3235639/
To my understanding of that definition it means that gaseous cysts are found in intestinal wall. As for causes, the exact cause isn't known, but the articles references that "it may appear in association with ileal surgery, colonoscopies, chronic pulmonary disease, connective tissue disorders and ingestion of sorbitol or lactulose."
I hope this information and article is helpful. Is this a condition that you or someone you know has been recently diagnosed with?