Castleman disease or angiofollicular lymph node hyperplasia is an uncommon cause of an incidental abdominal mass found on imaging. The etiology of Castleman disease is relatively unknown, however, it is thought to be primarily associated with an oversecretion of interleukin-6. The oversecretion of this pro-inflammatory cytokine leads to lymph node hyperplasia. Castleman disease can be classified into 2 categories: unicentric or multicentric. Most cases of unicentric Castleman disease are asymptomatic and are found on routine imaging. It is found predominately in middle-aged persons of equal sex and is managed primarily by surgical resection. We present here a case of a peripancreatic mass diagnosed by surgical excision as Castleman disease, hyaline vascular type.
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