Myasthenia Gravis as a Paraneoplastic Manifestation of Renal Cell Carcinoma: More Than a Coincidence?

Background: Myasthenia gravis is an autoimmune neuromuscular disease primarily caused by autoantibodies against nicotinic acetylcholine receptors (AChRs) at the neuromuscular junction. However, extrathymic malignancies need to be considered in the elderly population.

Purpose: Although thymic malignancy is the most common tumour association, several extrathymic malignancies complicated with myasthenia gravis have been reported.

A Rare Variant of Meningioma: Case Report and Review of Literature.

Meningioma is a morphologically heterogeneous tumour arising from meningothelial cells that has been classified by the World Health Organization into 15 different histological types and graded into three types groups (Grade I, II, and III) based on the biological behavior. Metaplastic meningioma is a rare subtype of meningioma characterized by focal or widespread mesenchymal differentiation in the form of bone, cartilage, fat, or xanthomatous tissue elements. Xanthomatous meningioma is a subclass of metaplastic meningioma which is exceedingly rare.