Rosai Chapter 18 - Anus Flashcards
Most distal aspect of the anal canal
-Squamous zone
The junction between the anal canal and the perianal skin
Anal verge or Hilton’s white line
Also known as Anal or Semilunar valves
Transverse plicae
Positive or Negative
IHC for Anal glands:
-CK7
Positive
Positive or Negative
IHC for Anal glands:
-CK19
Positive
Positive or Negative
IHC for Anal glands:
-CK20
Negative
Also known as Transition zone
Intermediate or Cloacogenic zone
Two most important components of the anal musculature
- Internal Anal Sphincter
- External Anal Sphicter
A component of the anal musculature that is a continuation of the circular muscle coat of the rectum
-Internal Anal Sphincter
A component of the anal musculature that is a complex triple-loop structure
-External Anal Sphincter
Three major type of Anorectal Malformations
- High or Supralevator Anomalies (40%)
- Low or Translevator Anomalies (40%)
- Intermediate Anomalies (15%)
Major type of Anorectal Malformation
- Rectal atresia
- Anorectal agenesis
- Cloacal malformations
-High or Supralevator Anomalies (40%)
Major type of Anorectal Malformation
-Serious prognosis because of severe obstruction
-High or Supralevator Anomalies (40%)
Major type of Anorectal Malformation
-Commonly associated with other congenital anomalies
-High or Supralevator Anomalies (40%)
Major type of Anorectal Malformation
Innervation of the pelvic muscle - Defective
-High or Supralevator Anomalies (40%)
Major type of Anorectal Malformation
Fistula or Fistulous tract - Rectum to the bladder, urethra, or vagina
-High or Supralevator Anomalies (40%)
Major type of Anorectal Malformation
- Ectopic (Perineal, Vestibular, or Vulvar) anus
- Anal stenosis
- Imperforate (Covered) Anus
-Low or Translevator Anomalies (40%)
Major type of Anorectal Malformation
-Obstructions is rarely severe
-Low or Translevator Anomalies (40%)
Major type of Anorectal Malformation
-Not associated with other congenital anomalies
-Low or Translevator Anomalies (40%)
Major type of Anorectal Malformation
Innervation of the pelvic muscle - Normal
-Low or Translevator Anomalies (40%)
Major type of Anorectal Malformation
Fistula or Fistulous tract - Present or Absent
-Low or Translevator Anomalies (40%)
Major type of Anorectal Malformation
- Anal agenesis
- Anorectal stenosis
- Anorectal membrane
-Intermediate Anomalies (15%)
Major type of Anorectal Malformation
-Less common
-Intermediate Anomalies (15%)
Two types of Hemorrhoids
- External
- Internal
Type of Hemorrhoids
-derived from the external/inferior hemorrhoidal plexus below the dentate line
External
Type of Hemorrhoids
-covered by skin or squamous mucosa
External
Type of Hemorrhoids
-derived from the superior hemorrhoidal plexus above the dentate line
-Internal
Type of Hemorrhoids
-covered by rectal or transitional mucosa
Internal
LGV or IBD
-Mild to moderate acute inflammation
LGV
LGV or IBD
-Well-developed changes of chronicity such as basal plasmacytosis, Architectural distortion, and Paneth cell metaplasia - Absent
LGV
AIN or PAIN
-used for lesions in squamous mucosa of the anal canal itself
AIN
AIN or PAIN
-lesions affecting perianal skin within 5cm of the anal verge
PAIN