Infantile-onset GSDII Infantile-onset GSDII. A, An 8-month-old baby girl was diagnosed at 2 months of age because of floppiness, poor feeding, and delayed developmental milestones (note the head-lag and the frog-like posture of the legs). Upon clinical investigation, generalized muscle weakness, cardiac enlargement, and macroglossia were noted. The liver was palpable at 3 cm below the costal margin. The finding of complete acid α-glucosidase deficiency in cultured skin fibroblasts established the diagnosis. B, Chest roentgenogram of a 4-month-old female infant with generalized glycogen storage disease type II. The massive heart dominates the film. C, Electron micrograph of a portion of a hepatic parenchymal cell from a liver biopsy of a patient with acid α-glucosidase deficiency. Two vacuoles filled with glycogen are seen at magnification ×69,000. A membrane can be followed around most of the periphery of the vacuoles. (From Baudhuin P, Hers HG, Loeb H, Lab Invest 13:1139, 1964. Used with permission.) D, The muscle biopsy shows massive accumulation of glycogen in virtually all fibers (5 μM sections fixed with glutaraldehyde and stained with PAS). (Courtesy of Dr. Ans T. van der Ploeg and Dr. M. Christa B. Loonen, Sophia Children's Hospital, Rotterdam.) E, The heart of a patient at autopsy (age at death was 5 months). The heart is greatly enlarged, with thickened ventricles, due to extensive glycogen infiltration. There is some endocardial thickening. Source: Glycogen Storage Disease Type II: Acid α-Glucosidase (Acid Maltase) Deficiency, The Online Metabolic and Molecular Bases of Inherited Disease Citation: Valle D, Beaudet AL, Vogelstein B, Kinzler KW, Antonarakis SE, Ballabio A, Gibson K, Mitchell G. The Online Metabolic and Molecular Bases of Inherited Disease; 2014 Available at: https://ommbid.mhmedical.com/DownloadImage.aspx?image=/data/books/971/ch135fg1.png&sec=62642001&BookID=971&ChapterSecID=62641992&imagename= Accessed: October 17, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved