Abstract Background: Elastofibromadorsi is an uncommon benign pseudotumor. We aimed to assess its demographic, clinical and radiological features. Materials and methods: We retrospectively re-evaluated all thoracic CT scans and MRI's of Babak imaging center to identify cases of elastofibromadorsi. Such variables as age, gender, weight, height, body mass index, handedness, and symptoms were extracted from their medical records. Hounsfield numbers and mass laterality were determined by three radiologists. Also, suspicious patients were asked to undergo punch biopsies. Data were analyzed using SPSS software. Results: Prevalence rate of elastofibroma dorsi was 1.2%, after reviewing 10,056 imaging records. Most patients (69%) were women (p<0.05). Mean age±SD was 62.7±2.3 (range: 28-72) with the highest frequency in the middle age (p<0.05). Majority of cases were unilateral (77.5%), commonly on the right side (95% of unilateral lesions). Eighty-eight percent of right- vs. 71% of left-handed individuals had the mass ipsilateral to their dominant side (p<0.05). About 2/3 of patients were asymptomatic. Mean±SD Hounsfield unit of the masses was 33±4.1 (range:19-48), while for the adjacent muscle, Hounsfield unit it was 46±3.7 (range:35-55). All taken biopsies confirmed the diagnosis of elastofibromadorsi. Conclusion:Most cases were found unilaterally on the right side of middle-aged women.