A 48-year-old man with AIDS/HIV and a previous history of tuberculous pericarditis 25 years earlier was admitted to our department of infectious diseases because of P. carinii pneumonia. A CT (computed tomography) scan described diffuse pericardial thickening with extensive pericardial calcifications on both ventricles. A transthoracic echocardiogram showed all the typical hemodynamic features of pericardial constriction. A review of the CT with 3D reconstruction revealed the presence of ring-shaped pericardial calcification at the basal segments of right and left ventricles extending over the inferior atrioventricular groove, the inferior interventricular groove and the cranial wall of the right atrium. Only a few cases of ring-shaped constrictive pericarditis have been reported and both global ventricular constriction and localized segmental constriction have been described. Our case wants to underline how important a comprehensive multi-modality imaging approach is to this rare form of constrictive pericarditis.