Expected headings
"Related pathology"
"The ganglion impar, also known as the ganglion of Walther, is the midline autonomic ganglion located in the lower pelvis. It is the most distal convergence of the pelvic sympathetic chain, which is usually located anterior to the coccyx. It can be found anywhere between the sacrococcygeal joint and the tip of the coccyx and may occasionally be paired, unilateral or absent entirely."