Transmission electron microscopy is useful for studying subcellular compartment storage disorders at high resolution. It uses electrons rather than light to image structures, allowing visualization of organelles and other structures as small as 2 angstroms. Immunoelectron microscopy can identify the intracellular location of specific proteins. Studies of lysosomal storage disorders show accumulation of materials within lysosomes by electron microscopy. Mitochondrial disorders also show abnormal mitochondria by electron microscopy. New techniques like immunoelectron microscopy, 3D reconstruction, and nanotechnology may provide further insights into subcellular storage disorders.