|Year : 2023 | Volume
| Issue : 1 | Page : 36-39
A modified rectal mucosal biopsy for the diagnosis of Hirschsprung’s disease: Zaria experience
Tunde Talib Sholadoye1, Halima Oziohu Aliyu2, Philip Mari Mshelbwala3
1 Division of Paediatric Surgery, Ahmadu Bello University Teaching Hospital, Zaria, Nigeria
2 Department of Pathology, Ahmadu Bello University Teaching Hospital, Zaria, Nigeria
3 Division of Paediatric Surgery, Department of Surgery, University of Abuja, Abuja, Nigeria
|Date of Submission||16-Oct-2022|
|Date of Acceptance||11-Nov-2022|
|Date of Web Publication||18-Jan-2023|
Dr. Tunde Talib Sholadoye
Division of Paediatric Surgery, Ahmadu Bello University Teaching Hospital, Zaria
Source of Support: None, Conflict of Interest: None
Background: Full-thickness rectal biopsy is often used for the diagnosis of Hirschsprung’s disease (where a suction biopsy kit is not available). This is associated with some challenges such as limited theatre space and the need for general anaesthesia. We aim to highlight the usefulness and sensitivity of a modification of the rectal mucosal biopsy without general anaesthesia in the diagnosis of Hirschsprung’s disease. Materials and Methods: This is a retrospective analysis of children with Hirschsprung’s disease who had rectal mucosal biopsy over a 16-year period (January 2004–December 2019). Research was approved with institutional number ABUTHZ/HREC/H22/2022. The patients had the biopsy with small, curved artery forceps, surgical blade, and dissecting scissors. Histological analyses of tissue were done. Clinical data and results were recorded on a structured pro forma, and the data were analysed. Results: There were 263 boys and 97 girls with a median age of 10.5 months. Only 37 (10.3%) of the rectal biopsies were done by consultants. Hirschsprung’s disease was confirmed in 279 (75.5%) of the partial-thickness biopsies, whereas 52 (14.4%) biopsies were inadequate specimens. Resident doctors were responsible for 92.2% (47) of inadequate biopsies (P = 0.63), although they did 89.7% of all biopsies. In one (0.3%) patient, the procedure ended as a full-thickness biopsy leading to a significant haemorrhage that required blood transfusion. Conclusions: The modified rectal mucosal biopsy is a simple, safe, and effective method for making the diagnosis of Hirschsprung’s disease. This is performed without general anaesthesia and is useful where a suction biopsy kit is unavailable.
Keywords: Grasp biopsy, Hirschsprung’s disease, modified rectal mucosal biopsy
|How to cite this article:|
Sholadoye TT, Aliyu HO, Mshelbwala PM. A modified rectal mucosal biopsy for the diagnosis of Hirschsprung’s disease: Zaria experience. J West Afr Coll Surg 2023;13:36-9
|How to cite this URL:|
Sholadoye TT, Aliyu HO, Mshelbwala PM. A modified rectal mucosal biopsy for the diagnosis of Hirschsprung’s disease: Zaria experience. J West Afr Coll Surg [serial online] 2023 [cited 2023 Feb 6];13:36-9. Available from: https://jwacs-jcoac.com/text.asp?2023/13/1/36/367964
| Introduction|| |
Full-thickness rectal biopsy (FRB) is often used for the diagnosis of Hirschsprung’s disease (HD), where a suction biopsy kit is not available. This was first advocated by Swenson and Bill in 1948, though it has some attendant constraints such as limited theatre space and the need for general anaesthesia. Noblett devised the rectal suction biopsy (RSB) tube for diagnosis; however, facilities for suction biopsy are not readily available in most resource-limited settings. We, therefore, decided to highlight the usefulness and sensitivity of a modification of the rectal mucosal biopsy without anaesthesia in the diagnosis of HD.
| Materials and Methods|| |
This is a retrospective review of children with HD, who had modified rectal mucosal biopsy over 16 years (January 2004 –December 2019) in the Division of Paediatric Surgery, Ahmadu Bello University Teaching Hospital, Zaria, Nigeria. Research was approved with institutional number ABUTHZ/HREC/H22/2022. Clinical data and results were recorded on a structured pro forma, and the data were analysed using SPSS version 22.0.
Instruments required for the procedure include small, curved artery forceps, surgical blades, and dissecting scissors. Other materials are surgical gloves, lubrication jelly (K-Y jelly), and a piece of gauze [Figure 1].
No special bowel preparation is necessary.
All patients admitted to the paediatric surgery division with a suspected clinical diagnosis of HD requiring rectal biopsy were included in the study.
All patients with features of enterocolitis were excluded.
Informed consent and/or assent is obtained.
With the patient in the dorsal or lateral position, via the transanal route, the rectal mucosa is held with a curved artery forceps 1 cm above the dentate line (usually about 3 cm above the anal opening). The instrument is guided by the index finger of the nondominant hand into the rectum. Gently the rectal mucosa and submucosa are grasped and withdrawn through the anus without releasing the hold on the tissues. Difficulties in dragging the tissue through the anus indicate that the tissue grasped is too thick (including the muscular layer). The grasped tissue is then excised with a surgical blade or scissors beyond the tissue. The tissue obtained is immediately put in a formalin-containing specimen bottle and sent for histological analysis. The rectum is packed with gauze for 10–15 min. The patient on colonic washout had suspension of procedure for 2–3 days to allow for healing.
| Results|| |
There were 360 patients, 263 boys and 97 girls, with an age range of 3 days to 17 years (median = 10.5 months). The majority, 194 (53.9%), of the procedures were performed by senior registrars, whereas 108 (30.0%), 37 (10.3%), and 21 (5.8%) of the procedures were done by second-year registrars, consultants, and first-year registrars, respectively.
Initial partial-thickness biopsy was used to confirm the diagnosis of HD in 279 (77.5%) patients with suspected HD. In 52 (14.4%) of the patients, the biopsies were inadequate to make the diagnosis at the initial histological review. Twenty-nine (8.1%) of the patients suspected clinically to have HD had normal enteric ganglia. Resident doctors were responsible for 92.2% of inadequate biopsies (P = 0.63), although they did the majority (89.7%, 323) of all biopsies [Table 1]. Percentages of the inadequate biopsy were 10.8, 10.8, 17.6, and 38.1 with the consultant, senior registrar, second-year registrar, and first-year registrar, respectively. Consultants and senior registrars were considered to be experienced, whereas registrars were considered to be inexperienced. Biopsies done by experienced doctors were adequate for histological diagnosis, which was statistically significant (P = 0.01, [Table 1]).
|Table 1: Histological findings and doctor cadre that performed the procedure|
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There was a need for repeat biopsy in 48 (n = 360, 13.3%) patients: 42 (11.7%) who had a true inadequate specimen and four patients with an initial report of bowel with parasympathetic ganglia but still having persistent constipation had repeated biopsy of the rectal mucosal and were confirmed to have HD. Two patients had inadequate histology but due to parental request, repeat biopsies were not done because of temporary resolution of symptoms after decompression by colonic wash out. The repeat biopsy represented 0%, 8.3%, 8.3%, and 16.7% in 6, 12, 18, and 24 months old patients, respectively (<6 months to older patients, P = 0.06; <1 year compared with older patients, P = 0.15). The need for repeat biopsy was highest in first-year resident doctors performing the procedure under supervision [see [Table 2]]. With consultants and senior registrars were considered to be experienced, whereas first- and second-year registrars were considered to be inexperienced, no statistical significance was noted but when second-year residents who have had longer surgical exposure and skills were considered experienced, there was a significant statistical difference in inadequacy rate by the first-year residents (P = 0.005).
Boys were more likely to have a repeat biopsy done (n = 42/6; P = 0.02). In one (0.3%) of our patients, the procedure ended as a full-thickness biopsy leading to a significant haemorrhage that required blood transfusion after which the patient was discharged the following day without adverse sequelae. Amongst the 360 patients, 93 (25.8%) have had a definitive pull-through procedure. The overall sensitivity and specificity of this biopsy method are 98.8% and 100%, respectively.
| Discussion|| |
The diagnosis of clinically suspected HD in patients requires a histological diagnosis. A representative posterior rectal wall biopsy is usually taken 2 cm above the dentate line to demonstrate the absence of parasympathetic ganglia in submucosal and myenteric plexus with hypertrophied nerve trunks remain the gold standard to confirm the diagnosis.,
The diagnosis of HD in this study showed some delay with a median age of 10.5 months compared to other high-income settings where most diagnoses are made in the neonatal period.,,
Several methods, have been used to obtain a representative specimen for pathological diagnosis of HD, which included full-thickness biopsy under general anaesthesia, RSB, endoscopic biopsy, and instrument biopsy either using instrument alone or laryngeal biopsy forceps with biopsy tube. In this study, we use curved artery forceps to obtain the rectal biopsy. Studies observed that suction biopsy may not be effective in obtaining representative rectal biopsy for accurate diagnosis of HD in older children >6 months or 1 year. This was attributed to recurrent inflammation with associated mucosal oedema and increasing fibrosis making suction biopsy less effective in obtaining representative specimens with age, but this had no statistical significance in this study. A recent study recommended suction biopsy in infants but full-thickness biopsy in older children and multiple biopsies at 1.5 cm above the dentate line where suction biopsy is used. In our setting where suction biopsy kits are not readily available and anaesthesia for full-thickness biopsy may be challenging, instrument biopsy is a handy and very useful tool for the diagnosis of HD. This has been shown to be effective by an earlier study.
Skill levels of doctor
The skill level of the biopsy taker matters, being a blind biopsy. It was shown in some studies that trainees are more likely to take an insufficient biopsy compared with the consultants because of developing skills in RSB or FRB. This is more important as in this study, experience significantly affects the adequacy of specimens taken, and 83.9% (302) of the procedures were performed by a senior registrar or second-year registrar. And though the first-year registrar did only 5.8% (21) biopsies, 38.1% of these biopsies were inadequate with only 13% inadequacy rate in more experienced hands. This was statistically significant when compared with the other categories after correction for procedure frequency. Thus, there is an overall need for training and practice to ensure adequate biopsies are obtained for diagnoses.
Over the years, there has been a shift from performing a FRB to RSB because of increasing evidence that the difference between FRB and RSB does not significantly reduce the diagnostic value of the rectal biopsy in patients with clinical suspicion of HD.,, Instrument biopsy using a biopsy tube and laryngeal biopsy forceps has been shown to yield adequate samples including lamina propria mucosa, muscularis mucosa, and submucosal tissue in 88.9% of their patients.
Our modified partial-thickness biopsy had a sensitivity of 98.8%, with four false-negative results, and a specificity of 100%, with no false-positive findings; this is much higher than findings in an earlier study using RSB where the sensitivity of RSB to be 81%, with 12 false-negative results, and specificity of 97%, with four false-positive findings. Though we commonly take a single sample for histological evaluation, studies have shown that multiple samples increase the diagnostic yield.
Although a combination of biopsy with acetylcholinesterase enzyme histochemical staining method has been reported to have a diagnostic accuracy rate of 95.59% and a positive predictive value of 100%, we rely on biopsy alone because of the nonavailability of enzyme assay in our hospital’s pathology department.
Where the sample obtained is inadequate for histological diagnosis, a repeat biopsy is advocated. About 13% of our patients had repeated partial-thickness biopsy due to nonrepresentative samples from the biopsy, which is not uncommon in other studies, 8%–26%.,, The inadequacy rates in RSB and FRB were similar,, with some studies having as high as 20%., Multiple sampling reduced the rate of inadequate samples in these studies,, though, this is not our practice.
A repeated biopsy is more likely in biopsies performed by trainees as we observed more so in first-year resident doctors. Their proficiency increased as they performed more biopsies as observed amongst senior resident doctors and consultants. This was observed in other studies. Conversely, our study did not show a statistically significant need for repeated biopsy based on the experience of the doctor. Several studies observed the need for repeat biopsy in patients above 6 months to 1 year of age., In this study, no patient below 6 months required a repeat biopsy, and this advantage is fairly retained up to 18 months of life, although this was not statistically significant. It is contrary to the 3 years observed by Croffie et al. where grasp biopsy was compared to RSB.
Complications are uncommon following partial-thickness rectal biopsy, and when it occurs, it is usually mild. Complications tend to occur more in FRB compared to partial-thickness biopsy (grasp biopsy or RSB). Bleeding following biopsy is uncommon as observed in these studies., Some authors reported prolonged bleeding in 5.6%, and bowel perforation, following full-thickness biopsy. In some cases,, bleeding resulted in marked anaemia and needing a blood transfusion. Contrarily, a more recent international survey observed a high complication rate following RSB of up to 48.6%, most of which were self-limiting rectal bleeding but unacceptable high persistent rectal bleeding in 12.2% and rectal perforation in 9.5%. Therefore, adequate precaution and monitoring are required following the procedure to limit the occurrence of complications.
| Conclusions|| |
The modified rectal mucosal biopsy is a simple, safe, and effective method for confirming the diagnosis of HD. This is performed without general anaesthesia and is useful where suction biopsy kits are unavailable. Proper training of the biopsy taker in the procedure limits inadequacy rate, and judicious technique along with adequate monitoring following the procedure is necessary to limit complications.
We acknowledge the contributions of all specialists and doctors that participated in the actual biopsies and the care of our patients.
Financial support and sponsorship
Conflicts of interest
There are no conflicts of interest.
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[Table 1], [Table 2]