title: Myasthenia gravis and lymphoblastic lymphoma involving the thymus: a rare association.
abstract: Myasthenia gravis (MG) is an autoimmune neuromuscular junction disease. An association between thymic epithelial neoplasms and MG is well known. However, it is rarely associated with hematologic malignancies. In particular, very few cases of lymphoblastic lymphoma involving the thymus and MG have been reported. Here we report a case T-cell lymphoblastic lymphoma involving the thymus who developed MG after the initial diagnosis. The patient initially presented with a mediastinal mass which was diagnosed as lymphoblastic lymphoma. MG was diagnosed during leukemic relapse in this patient and was based on clinical presentation and neurophysiologic studies including single fiber electromyography (EMG) and repetitive nerve stimulation tests. In contrast to the other cases with such an association, the myasthenic symptoms presented nine months after the diagnosis of lymphoma by thymectomy. The patient had a highly aggressive clinical course and was resistant to various chemotherapy regimens.
authors.affiliation: Department of Pathology, Hacettepe University School of Medicine, Ankara, Turkey. muco101@yahoo.com
authors.forename: A H
authors.initials: AH
authors.lastname: Uner
authors.forename: H
authors.initials: H
authors.lastname: Abali
authors.forename: H
authors.initials: H
authors.lastname: Engin
authors.forename: A
authors.initials: A
authors.lastname: Akyol
authors.forename: S
authors.initials: S
authors.lastname: Ruacan
authors.forename: E
authors.initials: E
authors.lastname: Tan
authors.forename: I
authors.initials: I
authors.lastname: Güllü
authors.forename: K
authors.initials: K
authors.lastname: Altundağ
authors.forename: N
authors.initials: N
authors.lastname: Güler
mesh_terms: D000328:Adult; D001854:Bone Marrow Cells / Q000473:pathology; D006801:Humans; D016246:Lymphocytes, Tumor-Infiltrating / Q000473:pathology; D008297:Male; D009157:Myasthenia Gravis / Q000175:diagnosis / Q000209:etiology*; D054198:Precursor Cell Lymphoblastic Leukemia-Lymphoma / Q000097:blood / Q000150:complications* / Q000175:diagnosis / Q000473:pathology; D013934:Thymectomy; D013953:Thymus Neoplasms / Q000097:blood / Q000150:complications* / Q000175:diagnosis / Q000473:pathology