THYMUS - Myasthenia Gravis

Description of Specimen
The specimen is a markedly enlarged thymus (the patient was aged 21 years at the time of removal). It shows a characteristic two lobes with blunting of the lower poles. Sections showed a uniform hyperplasia.
This man presented with a short history of diplopia and drooping of the left lower eyelid. Investigation established the diagnosis of myasthenia; the gland was removed, and apart from recurrent sternal infection the patient is alive and well five years later.