abnormal sympathetic ganglion morphology abnormal paravertebral ganglion morphology abnormal chain ganglion any structural anomaly of the groups of postsynaptic neurons located at intervals along the sympatheic trunk, including the superior cervical, middle cervical and stellate (cervicothoracic) ganglia as well as the thoracic, lumbar and sacral ganglia abnormal ganglia of sympathetic trunk abnormal paravertebral ganglia MPheno.ontology abnormal sympathetic chain ganglia abnormal chain ganglia MP:0008317