title: Evidence for collagen fibrils inside the cells of granular cell myoblastomas.
abstract: An electron microscope study was performed on two cases of subcutaneous granular cell myoblastomas. Phosphotungstic acid staining reveals the intracellular formation of collagen fibrils both inside the granules and scattered outside them, but always in relation with ribosomes or ergastoplasmic sacs. Pericellular deposition of basal-membrane-like material is a constant feature; however it appears to be more a precollagen material, extruded by cells, than a true basal membrane. This observation strongly supports the view that granular cells in Abrikossoff tumors are fibroblasts of muscle (and nerve?) sheaths abnormally producing precollagen material.
authors.affiliation: Istituto di Anatomia ed Istologia patologica dell'Università di Sassari, Divisione Dermatologica dell'Ospedale San Francesco di Nuoro, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Costanzi
authors.forename: L
authors.initials: L
authors.lastname: Bosincu
authors.forename: S
authors.initials: S
authors.lastname: Denti
authors.forename: S
authors.initials: S
authors.lastname: Pittaluga
authors.forename: E
authors.initials: E
authors.lastname: Sanna
mesh_terms: D000293:Adolescent; D002648:Child; D003094:Collagen / Q000032:analysis*; D004396:Coloring Agents; D005260:Female; D005347:Fibroblasts / Q000737:chemistry; D016586:Granular Cell Tumor / Q000737:chemistry* / Q000648:ultrastructure; D006801:Humans; D008297:Male; D008854:Microscopy, Electron; D010772:Phosphotungstic Acid; D012782:Shoulder; D012983:Soft Tissue Neoplasms / Q000737:chemistry* / Q000648:ultrastructure; D013194:Staining and Labeling / Q000379:methods
chemical_list: D004396:Coloring Agents; D010772:Phosphotungstic Acid; D003094:Collagen