Hemophagocytic lymphohistiocytosis Hemophagocytic lymphohistiocytosis also called HLH syndrome is a rare, life-threatening intense immune activation syndrome in which your body makes too many activated immune cells

Rosai Dorfman disease Rosai-Dorfman disease (RDD) also called Rosai-Dorfman-Destombes disease or sinus histiocytosis with massive lymphadenopathy (SHML), is a rare benign non-Langerhans cell histiocytosis which is

Erdheim–Chester disease Erdheim-Chester disease (ECD) also known as lipid granulomatosis or polyostotic sclerosing histiocytosis, is a rare slow-growing blood cancer, a non-Langerhans cell histiocytosis neoplasm, which

What is Langerhans cell histiocytosis Langerhans cell histiocytosis (LCH) previously referred to as Hand‐Schuller‐Christian disease, Letterer‐Siwe disease, eosinophilic granuloma or histiocytosis X, is a rare

What is eosinophilic granuloma Eosinophilic granuloma now known as Langerhans cell histiocytosis, is a group of rare disorders in which too many Langerhans cells (a

What is Mirizzi syndrome Mirizzi syndrome is a rare condition caused by the obstruction of the common bile duct or common hepatic duct by external

Patella fracture A patella fracture is a break in the patella or kneecap, the small bone that sits at the front of your knee (see

What is ectopia lentis Ectopia lentis is defined as dislocation or displacement of the natural crystalline lens of the eye ((Nelson LB, Maumenee IH. Ectopia

Rhesus disease Rhesus disease also called Rh incompatibility or Rh disease, is a dangerous kind of anemia. Anemia is when a person doesn’t have enough

What is Rh incompatibility Rhesus (Rh) incompatibility happens when your blood is Rh-negative and your baby’s blood is Rh-positive. This means your blood and your