Ultrasmall intrapulmonary lymph node: usual high-resolution computed tomographic findings with histopathologic correlation.

OBJECTIVE

To clarify high-resolution computed tomographic findings of ultrasmall intrapulmonary lymph node (IPLN) with histopathologic correlation.

METHODS

Fourteen IPLNs 3 to 6 mm in diameter were identified in 7 lobectomy specimens. Preoperative multidetector-row, high-resolution computed tomography covering the whole lobe was evaluated and compared with histopathologic findings.

RESULTS

Thirteen of 14 nodules appeared as well-defined solid nodules. The shape was polygonal or angular in 11 and round or oval in 3. Thirteen of 14 nodules were located within 15 mm of pleura. All 11 nodules apart from pleura were accompanied with linear opacity contiguous with pleura. Ten of 14 nodules were adjacent to peripheral pulmonary veins, and 4 were adjacent to linear opacity from pulmonary veins. These findings were confirmed pathologically, and linear opacities were consistent with thickened or normal interlobular septa.

CONCLUSIONS

Ultrasmall IPLN has usual high-resolution computed tomographic findings reflecting histopathologic findings.