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Difference between revisions of "Hemorrhoid"
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| Micro = polypoid lesion (epithelium on three sides) with large dilated veins and thick-walled vessels +/- fibrin thrombi, +/-edema, covered by squamous epithelium +/- keratinization and/or columnar epithelium | | Micro = polypoid lesion (epithelium on three sides) with large dilated veins and thick-walled vessels +/- fibrin thrombi, +/-edema, covered by squamous epithelium +/- keratinization and/or columnar epithelium | ||
| Subtypes = | | Subtypes = | ||
| LMDDx = [[fibroepithelial polyp]], vascular lesions | | LMDDx = [[fibroepithelial polyp]], vascular lesions (e.g. [[Kaposi sarcoma]]) | ||
| Stains = | | Stains = | ||
| IHC = | | IHC = | ||
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| Prognosis = benign | | Prognosis = benign | ||
| Other = | | Other = | ||
| ClinDDx = other causes of rectal bleeding | | ClinDDx = other causes of rectal bleeding (e.g. [[colorectal carcinoma]]), [[malignant melanoma]] | ||
}} | }} | ||
'''Hemorrhoid''' is a benign pathology of the rectal venous plexus, that may mimic more serious pathology, i.e. [[cancer]]. | '''Hemorrhoid''' is a benign pathology of the rectal venous plexus, that may mimic more serious pathology, i.e. [[cancer]]. | ||
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*Grey mucosa. | *Grey mucosa. | ||
*Pale or purple stroma. | *Pale or purple stroma. | ||
DDx - clinical: | |||
*[[Malignant melanoma]].<ref name=pmid11592745>{{Cite journal | last1 = Felz | first1 = MW. | last2 = Winburn | first2 = GB. | last3 = Kallab | first3 = AM. | last4 = Lee | first4 = JR. | title = Anal melanoma: an aggressive malignancy masquerading as hemorrhoids. | journal = South Med J | volume = 94 | issue = 9 | pages = 880-5 | month = Sep | year = 2001 | doi = | PMID = 11592745 }} | |||
</ref> | |||
===Microscopic=== | ===Microscopic=== | ||