title: Medial rectus muscle myositis as an atypical presentation of mucosa-associated lymphatic tissue lymphoma: a case report.
abstract: Here we describe the rare case of a 55-year-old man with medial rectus muscle myositis as an atypical presentation of non-Hodgkin B-cell mucosa-associated lymphoma (MALT). Pathology and immunohistochemistry of the affected muscle confirmed the diagnosis of a neoplasm. The primary etiology of orbital myositis is Graves' ophthalmopathy, but several other diseases may cause this clinical presentation. Therefore, the neoplastic causes must be eliminated from the differential diagnoses. non-Hodgkin B-cell mucosa-associated lymphoma is the most common histological type of lymphoma in the orbit, with the conjunctiva and lacrimal glands being the most commonly affected sites. However, it may also present in atypical forms involving others sites and tissues.
authors: Department of Ophthalmology, Universidade Federal de São Paulo.
authors: Juliana Sá Freire Medrado
authors: JS
authors: Dias
authors: Department of Ophthalmology, Universidade Federal de São Paulo.
authors: Mirtha Alicia Ramirez
authors: MA
authors: Dittrich
authors: Department of Ophthalmology, Universidade Federal de São Paulo.
authors: Jacqueline Martins de
authors: JM
authors: Sousa
authors: Department of Ophthalmology, Universidade Federal de São Paulo.
authors: Luiz Fernando
authors: LF
authors: Teixeira
authors: Department of Ophthalmology, Universidade Federal de São Paulo.
authors: Paulo Gois
authors: PG
authors: Manso
mesh_terms: D001706:Biopsy; D006801:Humans; D007150:Immunohistochemistry; D018442:Lymphoma, B-Cell, Marginal Zone / Q000150:complications / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D009801:Oculomotor Muscles / Q000473:pathology*; D055622:Orbital Myositis / Q000209:etiology / Q000473:pathology*; D009918:Orbital Neoplasms / Q000150:complications / Q000473:pathology*