2.
腮腺CT影像报告与数据系统的诊断标准
The diagnostic criteria of PI-RADS
| PI-RADS | Criteria |
| PI-RADS, Parotid Imaging Reporting and Data System. | |
| 1: Normal parotid gland | There are definitely no masses in the parotid gland |
| 2: More likely benign | (1) Multiple bilateral or unilateral masses presented regular arc border and oval contour with enhancement and without enlarged or necrotic lymph nodes around the parotid gland and neck; (2) A single tumor may also be considered if it is typical (e.g. oval, with obvious and uniform enhancement in the first enhancement phase, with smooth clear border or a low-density fat envelope) |
| 3: Indeterminate | (1) Single, round, no enhancement or uniform enhancement, most of the boun-dary clear, for example majorly clear or partially ill-defined; (2) Granular with uneven enhancement but definite boundary; (3) Multiple without enhancement, and without enlarged or necrotic lymph nodes around the parotid gland and neck; (4) Small tumors, that means, all tumors diameter less than 1 cm are included, regardless of their enhancement features |
| 3b: Inflammation including Sjögren syndrome and IgG4 |
In multiple gland, lesions are diffuse, with enhancement, without necrotic lymph nodes around the neck |
| 4: Probably malignant | (1) Single lesion, the shape is slightly irregular, part of the boundary is indistinctly (the boun-dary marked 3 or 4) or the membrane enhancement with villous edges; (2) The enhancement type is medium enhancement even slightly enhancement, solid lesion with little or without cystic degeneration; (3) Soft tissue density or with partial fluid especially with calcification, a small amount of unilateral diffuse; (4) Have large masses of irregular calcification with swelling lymph nodes but without necrosis lymph nodes |
| 5: Highly suggestive malignancy | (1) Necrotic lymph nodes are seen in the neck; (2) The boundary is unclear, the shape is irregular; (3) The border of the surrounding muscles, bones or fat tissues are not clear, which means destruction |
| 6: Already had malignant diagnosis | Had pathological result to pronounced it is a malignant neoplasm |
| 7: Unsatisfied illustration on CT | The density of neoplasm and the parotid is too nearly to find out what the neoplasm is really like. But couldn’t exclude that a neoplasm may exist |