Sampson Jacinda B, Chin Steven S, Clayton Frederic C, Pestronk Alan, Swoboda Kathryn J, Flanigan Kevin M
Department of Neurology, University of Utah, Salt Lake City, UT, USA.
Neuromuscul Disord. 2006 Jun;16(6):391-3. doi: 10.1016/j.nmd.2006.03.013. Epub 2006 May 11.
We present a case of juvenile dermatomyositis with unusual histopathologic findings. The child presented with a course consistent with dermatomyositis, a diagnosis confirmed by finding reticulotubular aggregates in endothelial cells on electron microscopy. However, histopathology of his muscle biopsy revealed a striking pattern of glycogen accumulation, to an extent similar to that seen in glycogen storage diseases; this degree of accumulation could potentially confound histopathologic diagnosis.
