Case 312

A 29-year-old woman was referred for US of bilateral breasts during evaluation for noncyclical mastalgia predominantly in the left breast of 8 months duration. She had been taking selective serotonin receptor inhibitors for the past 6 months for a clinical diagnosis of generalized anxiety disorder. A detailed medical history revealed breast cancer in the patient's mother and grandmother. There was no history of weight loss or appetite loss, nor was there a history of any altered bowel or bladder habits. The patient was overweight, with a body mass index of 26.8 kg/m², and appeared anxious during the general physical examination, with an increased pulse (102 beats per minute) and normal blood pressure (118/82 mm Hg). Local examination revealed multiple small mobile painful lesions that were palpable in all quadrants of the bilateral breasts, anterior abdominal wall, and forearm. On further questioning, the patient reported similar painful lesions were present in her mother and one brother. Laboratory investigations showed a normal hemoglobin level (12.4 g/dL; normal range, 12-15 g/dL), a total leukocyte count of 9000 cells per microliter (9 cells × 10⁹/L) (normal range, 4500-11 000 cells per microliter [4.5-11 cells × 10⁹/L]), a normal differential leukocyte count (74% neutrophils [normal range, 40%-80%], 24% lymphocytes [normal range, 20%-40%], and 2% eosinophils [normal range, 1%-4%]), and an erythrocyte sedimentation rate of 5 mm per hour (normal range, 0-29 mm per hour). High-frequency US of bilateral breasts (Figs 1, 2) was performed in conjunction with Color Doppler US (Fig 3) and shear-wave elastography of representative lesions in the breasts (Fig 4). Similar lesions were also found in the subcutaneous plane of the right forearm (Fig 5) and the anterior abdominal wall (Fig 6).