Color Doppler Ultrasonography Evaluation of Abdominal and Peripheral Vasculopathy in Systemic Sclerosis Patients

All study participants will undergo abdominal Ultrasound and Colour doppler ultrasound study of the superior and inferior mesenteric arteries and the resistance index and peak systolic velocity (cm/s) of radial and ulnar arteries measured by ultrasonography color Doppler with spectral wave analysis.