Table 2.
Deferred cases
| Site | Reason |
|---|---|
| Oral cavity, esophagus | Invasion assessment of a scant focus (2) |
| Lung | Unusual morphology of metastasis in a known case |
| Oral cavity, cervix | Grading of dysplasia (2) |
| Mediastinum | Grey zone between Hodgkin lymphoma and primary mediastinal B-cell lymphoma |
| Hard palate, urinary bladder, lung | Grading of tumor (3) |
| Ascitic fluid | Scant atypical cells (3) |
| Gallbladder | Scant focus of adenocarcinoma |
| Colorectum, lung, nasal cavity | Poorly differentiated malignant tumor (3) |
| Colorectum | Inflammatory atypia versus dysplasia |
| Ascitic fluid | Presence of nucleated RBCs |
| Liver biopsy | Carcinoma inconclusive on IHC |
| Breast | Fixation artifacts |
| Breast | IHC internal control unsatisfactory (2) |
| Breast, lung | Pixelation and WSI latency (2) |
| Lung | Neoplastic versus reactive spindle cell proliferation |
| Lung | Benign versus low-grade neoplasm |
| Endometrium | Proliferative changes versus hyperplasia |
*Numbers in brackets indicate number of cases with the same reason for deferral. ESI: Whole-slide imaging, IHC: Immunohistochemistry, RBCs: Red blood cells, WSI: Whole-slide imaging