A 5mm solid nodule in the diagonal fissure area of the left lung is mostly benign and therefore mostly not serious; however, there is a certain risk of lung cancer and other causes, and if the nodule is malignant, it is more serious.
The left lung can be divided into upper and lower lobes, and the interlobar fissure separating the two lobes is called the oblique fissure. Lung nodules are imaging manifestations of a variety of benign and malignant lung diseases. Solid nodules have a malignancy rate of about 7%, while 5mm lung nodules have a malignancy rate of about 1%.
Most of the 5-mm solid nodules in the diagonal fissure area of the left lung are benign diseases such as misshapen tumors, rheumatoid nodules, and sarcoidosis, which are mostly not serious and can be improved or cured by timely treatment. However, the nodule still has a low risk of being lung cancer, metastatic cancer, etc. If it is a malignant tumor, it is more serious, and untimely treatment may lead to distant transformation or even life-threatening.
It is recommended that the patient should consult the doctor in time, combine with tumor markers and inflammation indicators to comprehensively determine the possible causes of the disease, and follow the doctor’s instructions for follow-up, examination and treatment.