Fig. 7
a There is a cystic lesion (between callipers) causing direct compression over the ulnar nerve (yellow arrow) which appears hypoechoic. b PD FS axial and sagittal image demonstrate a hyperintense ulnar nerve (yellow arrow) which is getting compressed by a hyperintense cystic lesion (red arrow). c Per operative picture showing the ulnar nerve (yellow arrow) and the cyst (blue arrow). Histopathology revealed it to be a ganglion cyst. d Anechoic cystic lesion (red arrow heads) adjacent to the ulnar nerve (yellow arrow) at the elbow is seen with underlying cortical erosions (red arrow). The cystic lesion appears to arise from the nerve, suggestive of an intraneural ganglion cyst. e The hyperintense cystic lesion (red arrow heads), as seen in 5D, is seen arising from the adjacent hyperintense ulnar nerve (yellow arrow) lying along the course of the nerve on T2-weighted image [23]. Also noted are osteophytes (red arrow). f High-resolution ultrasound image showing common peroneal nerve (arrowheads) lying stretched over the underlying cystic lesion. g Hyperintense CPN is noted in this axial PDFS image (between crossheads) just before it wraps around the neck of fibula. The nerve is hyperintense as it is passing over the underlying cysts as seen on the right. PDFS image on the right shows hyperintense cysts which on excision biopsy proved to be ganglion cysts. h T1-weighted fat saturated post-contrast image shows enhancing cyst walls with no internal enhancement (arrow) suggestive of cystic nature of the lesion. Also seen is enhancement of the sheath of the common peroneal nerve (arrowhead) lying in close proximity to the cyst