A total of 177 male patients had been referred for imaging with P1 (19), P2 (113), P3 (11) or no P value (34), clinical history stating or querying gynaecomastia. Ultrasound was performed on all patients. All P1 and P2 patients were U1 or U2, and M1 or M2 if mammogram was performed (0/19 P1 patients, 20/113 P2 patients, 4/11 P3 patients). In P1, P2 and no P value patients, 6/166 patients underwent ultrasound-guided biopsy (5/6 B2 gynaecomastia, 1/6 B1 benign angiolipoma). In P3 patients, two biopsies were performed: B2 gynaecomastia in one patient, but one biopsy (M4U4) revealed B5b invasive carcinoma.