ArticleRadiology case reports2026
MRI appearance of a hemorrhagic external hemorrhoid at the anal verge with concomitant low anal fistula: A case report.
Article in Radiology case reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
0 citing papers in PubMed.
No citing paper in PubMed yet.
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
4 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
External hemorrhoids are commonly diagnosed clinically, and their MRI appearance is not routinely emphasized. We report a 69-year-old man who presented with a firm perianal nodule for more than 10 months and worsening anal pain for 10 days. Clinical examination suggested mixed hemorrhoids and a low anal fistula. MRI demonstrated a well-circumscribed nodular lesion at the anal verge with marked central hyperintensity on T1-weighted imaging, a peripheral low-signal rim, iso- to mildly hyperintense signal on T2-weighted imaging, no convincing restricted diffusion, and peripheral ring-like enhancement with central nonenhancement. Maximum-intensity-projection images showed continuity of the enhancing wall with the anal verge and anal mucosal margin. MRI also demonstrated a separate low anal fistula, allowing the fistulous tract and the hemorrhagic anal-margin lesion to be assessed as distinct abnormalities before surgery. Surgery revealed a dark-brown blood clot within the external hemorrhoidal lesion, and histopathology confirmed hemorrhoidal change and fistulous change in the respective specimens. In this individual case, the combination of intrinsic T1 hyperintensity, absence of convincing diffusion restriction, peripheral enhancement with central nonenhancement, and an anal-verge location was concordant with hemorrhagic hemorrhoidal change. These observations should be regarded as case-specific imaging clues rather than a validated diagnostic pattern, but they may be useful when considering the differential diagnosis of painful anal-margin lesions, particularly when anal fistula coexists.
Indexed as
Identifiers
What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.