《Slide 174.》Mixed hemorrhoid, Anus

A. Brief Descriptions：

1. Variceal dilations of anal and perianal venous plexuses.

2. Develop secondary to persistently elevated venous pressure within hemorroid plexus.

B. Gross Findings：

   略.

C. Micro Findings：

1. The lesions consist of thin-walled, dilated, submucosal varices that protruding beneath the anal and rectal mucosa.

2. They tend to become thrombosed and recanalized.

D. Others:

  略.

E. Reference：

1. Robbins Pathologic Basis of Disease, 6^th ed.  P.823.

　

 

 

【 Fig. 174-1 (LP)】Dilated thin-walled vessels under the anal (squamous) and rectal mucosa.

　

 

【 Fig. 174-2 (LP)】Dilated thin-walled, congested vessels with focal hemorrhage.

　

 

 

【 Fig. 174-3 (LP)】Thrombosed and recanalized.