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Right middle lobe.
| Artery variants | Abbreviation | Frequency |
|---|---|---|
| RA4+5 | 4+5 | 21% |
| RA4+5b, RA5a | 4+5, 5 | 1% |
| RA4+5a, RA5b | 4+5, 5 | 1% |
| RA4a, RA4b+5 | 4, 4 + 5 | 41% |
| RA4, RA5 | 4, 5 | 31% |
| RA4a+bi, RA5 | 4, 5 | 1% |
| RA4ai+5, RA4aii, RA4bi | 4+5, 4, 4 | 1% |
| RA4a, RA4b, RA5 | 4, 4, 5 | 1% |
| RA4ai, RA4aii, RA4b+5 | 4, 4, 4 + 5 | 1% |
| RA4, RA5a+bi, RA5bii | 4, 5, 5 | 1% |
| RML artery branches from BPA | 4% | |
| RA4b | 2% | |
| RA4ai | 1% | |
| RA5bi | 1% |
BPA, basal pulmonary artery.
