In general terms classical HD, i.e. short segment HD which occurs in 75% to 80% of cases, involves the distal sigmoid colon and rectum and is characterized histologically by nerve filaments which are large, thick, and compact. Nerve filaments are generally larger than 40 microns in diameter, and there are definitely no ganglion cells in these cases.
En términos generales la EH clásica, es decir la de segmento corto 75-80% de los casos que compromete la parte distal del colon sigmoides y el recto, se caracteriza histológicamente por tener filetes nerviosos gruesos, grandes generalmente mayores de 40 micras de diámetro, compactos y por supuesto sin células ganglionares.