In the most comprehensive study yet regarding morphological features of CDC73 mutated parathyroid tumors, the authors conclude that these lesions are characterized by sheet-like, compact growth rather than the usual acinar patterns visualized in the bulk of parathyroid tumors, as well as a typical eosinophilic cytoplasm distinct from the granular oxyphilic cell type often observed in areas of parathyroid adenomas [89]. The gene discussed is CDC73; the disease is parathyroid gland adenoma.