title: Factitial soft tissue pseudotumor due to injection of anabolic steroids: a report of 3 cases in 2 patients.
abstract: Traumatically induced inflammation or reactive processes are a relatively well-known phenomenon in both skin and soft tissue. These include panniculitides, fat necrosis, nodular fasciitis, and nonspecific fibrosis. Occasionally, traumatic reactions can be associated with factitial injury due to self-induced blunt trauma or injection of chemical agents. Factitial pseudotumors of soft tissue mimicking neoplasms and occurring in deep-seated locations are rare and not well recognized. We have had the opportunity to review a handful of cases over the years of soft tissue pseudotumors caused by self injection of steroids for the purposes of bodybuilding. Three of these cases in 2 patients are presented here. One patient developed a deep lateral thigh mass that was radiologically suspicious for sarcoma but upon core biopsy was found to be a lipogranulomatous reaction. The second patient had 2 masses occurring in the upper and lower extremity with an interval of 1 year between the two. This patient had both masses resected. The first had the appearance of a giant cell tumor with no immediately discernible foreign material. The second mass was initially presumed to be a metastasis from the upper extremity tumor and showed similar areas to the first specimen; however, it also had areas of obvious reactive features with foreign material. These features were found in the first tumor as well upon retrospective review. Both patients admitted to self injection of anabolic steroids after further history was sought by the clinicians. Deep soft tissue pseudosarcomas caused by injection of steroids are not well documented, and patient's reluctance to provide this information leads to difficulty in arriving at a correct diagnosis. Recognition of this possibility is important in avoiding incorrect diagnoses and unnecessary treatments.
authors.affiliation: Department of Pathology, University Health Network, Toronto, Ontario, Canada M5G 2C4. weinrebi@yahoo.ca
authors.forename: Ilan
authors.initials: I
authors.lastname: Weinreb
authors.forename: John R
authors.initials: JR
authors.lastname: Goldblum
authors.forename: Brian P
authors.initials: BP
authors.lastname: Rubin
mesh_terms: D000328:Adult; D045930:Anabolic Agents / Q000009:adverse effects*; D001132:Arm / Q000473:pathology* / Q000601:surgery; D049109:Cell Proliferation; D003937:Diagnosis, Differential; D006104:Granuloma, Plasma Cell / Q000139:chemically induced / Q000473:pathology* / Q000601:surgery; D006801:Humans; D007150:Immunohistochemistry; D007249:Inflammation / Q000139:chemically induced / Q000473:pathology / Q000601:surgery; D007267:Injections; D008297:Male; D008875:Middle Aged; D012983:Soft Tissue Neoplasms / Q000139:chemically induced / Q000473:pathology* / Q000601:surgery; D013848:Thigh / Q000473:pathology* / Q000601:surgery; D016896:Treatment Outcome
chemical_list: D045930:Anabolic Agents