Fig. 3.

Infectious cause: Mycobacterium fortuitum. A 32-year-old woman had a new tender, palpable mass in the left breast. Biopsy showed granulomas, and purulent drainage from the needle tract was positive for M. fortuitum. Treatment with antibiotics, based on the sensitivity of the organism, led to resolution of the infection. a Left mediolateral-oblique view showed multiple masses with prominent left axillary lymph nodes (red arrow) and periareolar skin thickening. b Ultrasound showed a complex, hypoechoic fluid collection (left) with sinus tract extending to skin (red arrow) (right)