Surveillance Imaging Findings of Lung Cancer Recurrence after Definitive Therapy

Area of Science:

• Oncology
• Radiology
• Medical Imaging

Background:

• Lung cancer is a leading cause of cancer mortality globally.
• Tumor recurrence after curative treatment presents significant clinical challenges.
• Surveillance imaging, particularly chest CT, is vital for detecting curable recurrent lung cancer.

Purpose of the Study:

• To outline the imaging patterns of lung cancer recurrence.
• To highlight challenges in detecting recurrence on CT scans post-treatment.
• To emphasize the importance of radiologist recognition for timely diagnosis.

Main Methods:

• Review of imaging characteristics of lung cancer recurrence.
• Analysis of how treatment modalities (surgery, radiation) affect post-treatment CT findings.
• Identification of patterns of local, regional, and distant recurrence.

Main Results:

• Recurrence patterns vary based on tumor histology (e.g., lepidic vs. spread through airspaces) and treatment.
• Post-treatment changes from radiation therapy can mimic or obscure recurrence.
• Disseminated recurrence can manifest as aerogenous, miliary, pleural metastases, or lymphangitic carcinomatosis.

Conclusions:

• Recognizing diverse imaging patterns of lung cancer recurrence is essential for radiologists.
• Understanding treatment-related changes on CT is critical for accurate interpretation.
• Improved diagnostic accuracy facilitates timely patient care and management of recurrent lung cancer.