Breakdown of inconclusive results by histological reason and type of biopsy
| Histological reason | Total (n=12) | Suction rectal biopsy (n=9) | Open strip biopsy (n=3) | P value |
| Superficial*, n (%) | 7 (58.3) | 7 (100.0) | 0 (0.0) | <0.001 |
| Distal†, n (%) | 4 (33.3) | 1 (25.0) | 3 (75.0) | 0.625 |
| Lymphoid follicles‡, n (%) | 1 (8.3) | 1 (100.0) | 0 (0.0) | 1.000 |
Calretinin stain was performed on 60.8% (48/79) of biopsies while nerve diameter was only reported in 46.8% (37/79) of biopsies overall.
*Superficial=containing limited or no submucosa for evaluation.
†Distal=containing anorectal junction mucosa not suitable for evaluation.
‡Lymphoid follicles=presence of lymphoid follicles preventing accurate evaluation.