label: orbital pseudotumor
label_lc: orbital pseudotumor
description: 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).