Round cells show:
CD20 shows focal positive reaction.
CD3 shows focal positive reaction.
CK20 is negative.
Synaptophysin is negative.
SOX-10 is negative.
SATB-2 is negative.
p63 is negative
Ki-67 LI is less than 3%.
Referred paraffin block for immunostaining of anorectal mass.
One referred paraffin block of previously submitted case number 1511.
Rectal mass, endoscopic biopsy, immunostaining:
COMMENT:
This pattern of immunostaining is excluding carcinoma, NHL and melanoma in submitted material. Such immunoreaction is rather consistent with an exuberant inflammatory process. Follow up endoscopy to ensure regressive course of these ulcers is essential to ensure the suggested inflammatory nature. If malignancy is still suspected, rebiopsy will be advised.