Latissimus dorsi. Case report of a rare lesion diagnosed by magnetic resonance imaging.

The latissimus dorsi is a flat muscle that covers most of the back. Its injury happens when there is avulsion of the tendon. There are currently few reported cases in the literature, but most sources agree that latissimus dorsi injuries are more common among professional athletes. The main injury sites should be highlighted: tendon, myotendinous junction, ventral muscle, and costal muscle. Patients with latissimus dorsi muscle injury describe a burning or popping sensation in the armpit followed by pain and weakness. Magnetic resonance imaging confirms the diagnosis of avulsion injury, defining its extent and excluding the hypothesis of the presence of other involvements and masses. We report a case of a 64-year-old woman who report pain in her right shoulder after a fall in the bathroom diagnosed with insertional rupture of the latissimus dorsi and teres major muscles. She was treated conservatively, presenting the range of motion recovered and being able to carry out daily activities after two months.