Arizona Boy Diagnosed with Rare Castleman Disease After Back Pain

New York, NY, August 29, 2026 — An 11-year-old boy in Arizona has been diagnosed with idiopathic multicentric Castleman disease, a rare disorder affecting the immune system, following a period of experiencing back pain.

The diagnosis came after the young patient began reporting symptoms of back pain. Further medical evaluation led to the identification of idiopathic multicentric Castleman disease. This condition is characterized by the abnormal proliferation of cells in lymph nodes and related tissues, a process that can lead to widespread inflammation and organ damage.

Castleman disease is classified into two main types: unicentric, affecting a single lymph node region, and multicentric, which impacts multiple lymph node regions and can be systemic. The multicentric form is less common but typically more severe. The term “idiopathic” signifies that the specific cause of the disease in this case is unknown, which is often the case for many diagnoses of this rare disorder.

The immune system disorder involves an overproduction of certain proteins, such as cytokines, which can trigger inflammation throughout the body. Symptoms can vary widely and may include fever, fatigue, night sweats, weight loss, and enlarged lymph nodes. In severe cases, it can lead to organ failure. The reported back pain in this Arizona boy is one manifestation that prompted medical investigation.

Information regarding the specific treatment plan or the current condition of the boy was not immediately available. The rarity of idiopathic multicentric Castleman disease means that awareness among the general public and even some medical professionals can be limited, often leading to delayed diagnosis. Support and research for Castleman disease are ongoing, aiming to improve understanding, diagnosis, and treatment outcomes for affected individuals.

Story summarized from the original created by Marina Peña on nypost.com, see more information here.