|Year : 2010 | Volume
| Issue : 2 | Page : 56-58
Hirschsprung's disease: Role of rectal suction biopsy - data on 216 specimens
Zillur Rahman1, Jafrul Hannan2, Saiful Islam1
1 Department of Pathology, Chittagong Medical College, Chittagong, Bangladesh
2 Department of Paediatric Surgery, Chittagong Maa-Shishu-O-General Hospital, Chittagong, Bangladesh
|Date of Web Publication||24-Sep-2010|
Department of Pathology, Chittagong Medical College, Chittagong
Source of Support: None, Conflict of Interest: None
| Abstract|| |
Background: The diagnosis of Hirschsprung's disease (HD) is dependent on the histological study of rectal ganglion cells, and an open rectal biopsy was the mainstay that required general anaesthesia (GA) and carried risk of postoperative rectal bleeding. Suction rectal biopsy later gained wide acceptance and became the choice as there is no requirement of GA and virtual absence of any complications. Materials and Methods: A retrospective review of the histological findings of 216 rectal suction biopsies studied from 2005 to 2009. Results: There were 143 male and 73 female children. 196 (90.7%) children were within 1 year of age. Among 216 rectal suction biopsies 181 (83.80%) were aganglionic, 27 (12.5%) were ganglionic and 8 (3.7%) were inadequate. Majority of patients were of less than 1 year of age (94.47%). Conclusions : The rectal suction biopsy is a bed side procedure, safe, cheap and time saving. There is high degree of accuracy, simplicity and absence of complications.
Keywords: Hirschsprung′s disease, suction biopsy, rectal biopsy
|How to cite this article:|
Rahman Z, Hannan J, Islam S. Hirschsprung's disease: Role of rectal suction biopsy - data on 216 specimens. J Indian Assoc Pediatr Surg 2010;15:56-8
|How to cite this URL:|
Rahman Z, Hannan J, Islam S. Hirschsprung's disease: Role of rectal suction biopsy - data on 216 specimens. J Indian Assoc Pediatr Surg [serial online] 2010 [cited 2018 May 28];15:56-8. Available from: http://www.jiaps.com/text.asp?2010/15/2/56/70640
| Introduction|| |
The definitive diagnosis of Hirschsprung's disease (HD) is based on the findings of rectal biopsy characterized by the absence of parasympathetic ganglia and the presence of hypertrophied nerve trunks in the bowel wall. ,, In recent years, suction biopsy has emerged as an important diagnostic tool. , This biopsy technique requires no general anaesthesia (GA) or suturing. So, many complications can be avoided. The procedure can be conducted as an outpatient basis, is suitable for all ages and is quite safe. 
Diagnostic accuracy depends on the adequacy of the specimen, level at which they were obtained, number of sections studied and the skill of the pathologist. When all the criteria are met, diagnostic accuracy reaches as high as 99.7%.  Hence suction biopsy becomes the initial and definitive modality used to evaluate the patient with constipation. The results with the use of this technique over the past five years are the subject of this study.
| Materials and Methods|| |
From January 2005 to December 2009, all specimens of rectal suction biopsy from children suspected to be having HD were studied. The specimens were received in 10% formalin solution and processed for paraffin embedding. Multiple serial sections were cut at 3-4 μm thickness. About 8-10 sections per slide were mounted and two slides were made and were stained with H and E and then examined under light microscope.
On microscopic examination, biopsy specimens were classified as: (A) Ganglionic: clearly definable characteristic clusters of ganglion cells could easily be discerned in the sub-mucosa just beneath the mucosa after examination of 6-10 sections. (B) Aganglionic: when ganglion cells were absent. On an average 10 sections were examined before a comment being made as absence of ganglion cells. (C) Unsatisfactory or inadequate: biopsies were reported inadequate when: (i) No or very minimal sub-mucosa is present; (ii) Sub-mucosa is occupied by a lymphoid follicle; (iii) Specimen is decomposed; (iv) Specimen reveals stratified squamous epithelium (biopsy from too low position).
| Results|| |
A total 216 rectal suction biopsy specimens were studied, specifically for the evaluation of HD.
Analysis of rectal suction biopsies revealed 181 (83.80%) were aganglionic, 27 (12.5%) ganglionic and 8 (3.7%) specimens were inadequate for proper histopathological diagnosis. Age at the diagnosis ranged from 1 day to 3 years. Among them 196 (90.7%) were within 1 year of age. Age distribution in HD patients showed 60.22% within 1 month of age and 94.47% within 1 year of age [Table 1]. Among these 216 patients, 143 were males and 73 were females. Specimens diagnosed as HD were 181 with 122 male and 59 females (male female ratio is 2.08:1) [Table 2].
| Discussion|| |
Swenson , established rectal biopsy for the histological diagnosis of HD, which was supported in the follow-up studies with a 98% diagnostic accuracy.  Since then rectal biopsy was done frequently to diagnose HD definitively as well to differentiate HD from other causes of constipation. However, a full thickness rectal biopsy was needed to be done after a pre-operative preparation, GA and occasional hospitalization for rectal bleeding.
In 1960, Gherhardi  showed identical aganglionosis in the submucosal and myenteric plexuses. In 1968, Smith  demonstrated sequential maturation of myenteric plexus in a cranial caudal direction and pointed the importance of degree of maturation as well as presence or absence of ganglionic cells in the diagnosis of HD. Aldridge and Campbell in 1968  confirmed the presence of hypoganglionic zone within 1-2 cm of anal verge and demonstrated that the density of ganglion cells in the submucosal plexus was sufficient above this level. All these works contributed to develop an ideal suction rectal biopsy procedure.
In 1969, Noblett  first established suction rectal biopsy with a modified biopsy instrument. The instrument yields specimen 3.5-5 mm in diameter, with at least 2 mm of submucosa and was specifically suited for the diagnosis of HD. Later studies ,,,, established the accuracy of rectal suction biopsy. This study reemphasizes suction rectal biopsy for the definitive diagnosis of HD based on its 99.7% accuracy rate, simplicity of technique and absence of complications.
Age at the time of diagnosis of HD showed that 57.41% were below 1 month of age and 86.11% were below 1 years of age. Those rectal suction biopsies revealed aganglionic showed almost similar picture, 60.22% and 94.47% of patients were below 1 month of age and below 1 year of age, respectively. Ikeda and Goto in 1984  showed 48.7% of diagnosed cases were within 1 month of age and 60% were within 1 year of age.
About 181 cases (83.80%) in this study were diagnosed as HD by the absence of ganglion cells and/or presence of thickened nerve bundles in the submucosa. In 27 cases (12.50%) ganglion cells were demonstrated, so HD were excluded. 8 (3.7%) specimens were inadequate due to little or no submucosa. Hannan et al Yunis et al and Weintraub et al reported inadequacy in 6.5, 15 and 10%, respectively in their studies. The rate of inadequate specimens in the present study is within justifiable range in comparison to the above studies.
Total eight inadequate samples were obtained. Of them 3 were from 1 month to 1 year, 3 were from 1-3 years and rest 2 were above 3 years of age. This result does not conform to the study of Croffie et al.  They found that the suction rectal biopsy is less likely to provide adequate submucosa for identification of ganglion cells after 3 years of age. But they worked only on children above 1 year of age. On the other hand, Pini-Pratoac et al demonstrated that age does not represent a risk factor for inadequacy of the specimen.
| Conclusion|| |
Rectal suction biopsy is a very simple, safe, quick, cheap and authentic technique for the diagnosis of HD. The procedure is quickly performed as outpatient basis in non-emergency situations. There is definitive diagnosis within 24 h and the hazards of GA can be avoided. High accuracy, simplicity and absence of complications strongly favour rectal suction biopsy as the procedure of choice for the diagnosis of HD.
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[Table 1], [Table 2]
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