Isolated teres minor denervation is an uncommon finding on sonographic examination. We present a case of a 64-year-old man with increased echogenity of the teres minor muscle and a slight reduction in muscle bulk. Investigation of a suspected axillary nerve lesion included a detailed sonographic examination of the posterior shoulder and the axillary space, followed by MR imaging and electrophysiologic testing. This case demonstrates the potential importance of examining rotator cuff muscles when performing sonographic examination of the shoulder in patients with persistent symptoms, no history of trauma, and absence of tendon tears.

A 56-year-old man presented with a painless lump in the left breast that had been growing for approximately 2 years. The patient also had bloody nipple discharge for the last 2 years. There were no other relevant features in the history, which included diabetes mellitus.Physical examination revealed a 3 cm soft mobile lump in the left breast and a palpable left axillary lymph node. Conventional low-dose mammography was performed initially, which demonstrated a well-circumscribed mass of intermediate density, posterior to the nipple. There were no calcifications (Fig. 1). In order to determine the solid or cystic nature of the lesion, an ultrasound study was performed. Using a 7.5 MHz probe, it showed a 27 mm × 22 mm lesion, predominately cystic, but an irregular soft tissue mass (13 mm × 12 mm) projected from the wall into the lumen (Fig. 2). Color and power Doppler revealed minimal vascularity in the mass. The axillary lymph node was of a reactive type and presented intensive vascularity of the hilus.On aspiration, bloody fluid was obtained and cytologic examination showed cellular atypia. Excisional surgery Figure 1. Low-dose mammography. Mediolateral oblique and craniocaudal views show a wellcircumscribed mass of intermediate density posterior to the nipple.