Spontaneous Resolution of Spinoglenoid Ganglion Cyst: A Case Series

Background Spontaneous resolution of a spinoglenoid notch ganglion cyst (SGC) without surgical treatment has been rarely reported; however, we have encountered this phenomenon occasionally. Therefore, we aimed to describe a case series of consecutive patients with SGC in whom it spontaneously resolved without surgical treatment. Methods We retrospectively reviewed 12 patients with magnetic resonance imaging (MRI)-confirmed SGC in whom it resolved without surgical treatment between January 2011 and March 2023. We included patients without abnormally increased signal intensity or muscle atrophy due to denervation from suprascapular neuropathy on MRI. Resolution of the SGC was confirmed via MRI or ultrasound at the follow-up visit, and suprascapular neuropathy was assessed using electromyography and nerve conduction studies when needed. For functional assessments, the visual analog scale (VAS) for pain and active range of motion of the shoulder were used to compare pre- and post-resolution follow-ups. Results Eleven men and one woman with a median age of 54.0 years (interquartile range [IQR] 37.0–65.3) were included in this study. The SGCs resolved spontaneously at a median of 13.2 months with an IQR of 8.2–23.0 after initial evaluation using MRI. The SGCs were multiloculated cysts with superior labrum anterior and posterior (SLAP) II–IX lesions, with a median diameter of 2.5 cm (IQR 2.0–2.8). The median VAS for pain (pre-resolution 5.0 [IQR 4.0–7.0] vs. post-resolution 1.0 [IQR 0.0–1.0], P = 0.002) and internal rotation at the back (pre-resolution 8.0 [IQR 7.0–10.3] vs. post-resolution 7.5 [IQR 7.0–8.0], P = 0.034) were significantly improved after the resolution. Conclusions Surgical treatment may not be necessary in all cases of SGC. Nonsurgical treatment may be a viable option in the absence of suprascapular nerve involvement or SLAP-related physical findings.