title: Rare association of thymoma, myasthenia gravis and sarcoidosis : a case report.
abstract: BACKGROUND
  The association of thymoma with myasthenia gravis (MG) is well known. Thymoma with sarcoidosis however, is very rare. We presented an interesting case with coexisting thymoma, MG and sarcoidosis.
  
  
  METHODS
  A 59-year-old female patient with a history of sarcoidosis was admitted to the hospital with a one-day history of sudden onset of right-sided partial ptosis and diplopia. Neurosarcoidosis with cranial nerve involvement was considered, but was ruled out by the clinical findings, and MG was confirmed by the positive tensilon test, electrophysiological findings and positive acetylcholine receptor binding antibodies. On further evaluation, a CT chest scan showed a left anterior mediastinal mass and bilateral lymphadenopathy. Post surgical diagnosis confirmed the thymoma and sarcoidosis in the lymph nodes.
  
  
  CONCLUSIONS
  When two or more diseases of undetermined origin are found together, several interesting questions are raised. It is important to first confirm the diagnoses individually. Immunologic mechanisms triggering the occurrence of these diagnoses together, are difficult to address. Although the coexistence of thymoma, MG and sarcoidosis may be coincidental, it is noteworthy to report this case because of the multiple interesting features observed as well as the rarity of occurrence.
authors.affiliation: Department of Neurology, Howard University Hospital, Georgia Avenue NW, Washington, DC, USA. mohan311@gmail.com
authors.forename: Mohankumar
authors.initials: M
authors.lastname: Kurukumbi
authors.forename: Roger L
authors.initials: RL
authors.lastname: Weir
authors.forename: Janaki
authors.initials: J
authors.lastname: Kalyanam
authors.forename: Mansoor
authors.initials: M
authors.lastname: Nasim
authors.forename: Annapurni
authors.initials: A
authors.lastname: Jayam-Trouth