Orbital Pseudotumor

**Definition:** A nonspecific tumor-like inflammatory lesion in the ORBIT of the eye. It is usually composed of mature LYMPHOCYTES; PLASMA CELLS; MACROPHAGES; LEUKOCYTES with varying degrees of FIBROSIS. Orbital pseudotumors are often associated with inflammation of the extraocular muscles (ORBITAL MYOSITIS) or inflammation of the lacrimal glands (DACRYOADENITIS).

**Tree numbers:** - C11.675.679

**Synonyms:** - Inflammatory Pseudotumor of Orbit - Inflammatory Pseudotumor, Orbital - Orbital Inflammatory Pseudotumor - Pseudotumor, Inflammatory, Orbital