What is (are) Tubular aggregate myopathy ?
Tubular aggregate myopathy is a very rare muscle disease where the presence of tubular aggregates represent the major, if not sole, pathologic change in the muscle cell.  It is often characterized by muscle weakness or stiffness, cramps, and exercise induced muscle fatigue. The exact cause of the condition is unknown. Sporadic and genetic forms have been reported. Some cases appear to be due to dominant mutations in the STIM1 gene.