👉 Myelocystic is a medical term used to describe a condition where there are multiple myeloid cells (red blood cells) in the bone marrow. This can occur when an individual has an autoimmune disorder called idiopathic thrombocytopenic purpura, which causes the body's immune system to attack its own red blood cells. The presence of these multiple myeloid cells in the bone marrow can lead to symptoms such as fatigue, weight loss, and other signs that indicate