ESPE Abstracts

Langerhans cell histiocytosis (LCH) is a rare disorder of unknown etiology affecting the mononuclear phagocyte system. It is characterized by clonal uncontrolled proliferation and accumulation of immature dendritic cells in different organs. Affected cells express CD1-alpha and/or CD207 (Langerin) on immunohistochemistry. Although bone is the most commonly affected organ (80%), all other organs can be affected either alone or in combination. LCH is classified into Single syste...

Pseudohypoparathyroidism (PHP) is a disorder caused by PTH resistance due to a genetic defect in imprinted GNAS cluster. It is characterized by high phosphorus, low to normal calcium and elevated PTH. It is classified into types 1a, 1b, 1c, pseudopseudohypoparathyroidism and type 2. Type 1a is often associated with Albright Hereditary Osteodystrophy (AHO) which is characterized by short stature, round facies, obesity, brachydactyly, ectopic calcifications and developmental del...