A 79-year-old man arrived at a hospital in South Korea after a week of shortness of breath and high fever. His chest CT looked like a worst-case scenario: a lung nodule, enlarged lymph nodes throughout the center of the chest and around both lung roots, fluid and thickening around the lungs, and a web of thickened lines through both lungs.
To his doctors, the picture raised strong suspicion of advanced lung cancer that had spread through the lung's lymphatic channels. It was not cancer. After two less invasive biopsies failed to give an answer, a surgical sample showed diffuse pulmonary lymphangiomatosis, an extremely rare disorder of the lymphatic vessels.
Then the disease did something unexpected. Without any treatment aimed at the condition, his symptoms cleared within three weeks. A team from Jeonbuk National University Hospital described the case in a report published July 8, 2026, in BMC Pulmonary Medicine.
Every Finding Pointed Toward Cancer
The CT showed an enhancing lung nodule, extensive lymph node enlargement in the mediastinum and at both lung roots, pleural effusion, pleural thickening, and diffuse interlobular septal thickening.
That last finding carried weight. Interlobular septa are thin partitions that divide the lung into small units and carry lymphatic vessels. When cancer cells spread along those channels, a process called lymphangitic carcinomatosis, the septa thicken in a pattern radiologists recognize. Combined with a nodule and enlarged nodes, the picture pointed toward metastatic lung cancer.
Doctors first tried less invasive routes. Endobronchial ultrasound-guided needle aspiration, which samples lymph nodes through the airway, and a pleural biopsy were both nondiagnostic. The team then performed video-assisted thoracoscopic surgery with a wedge resection, removing a small piece of lung.
Under the microscope, the tissue showed a diffuse overgrowth of interconnected lymphatic channels lined by endothelial cells. Staining for D2-40 and CD31, markers that identify lymphatic and vessel-lining cells, confirmed diffuse pulmonary lymphangiomatosis.
A Disease Usually Seen in the Young
Diffuse pulmonary lymphangiomatosis, often shortened to DPL, involves an abnormal proliferation of lymphatic vessels in the lungs, pleura and mediastinum. It is so uncommon that much of what doctors know comes from individual case reports.
A 2019 report in Medicine noted that DPL usually presents in children and young adults. Its authors described their 59-year-old patient as the oldest in the English-language literature they had reviewed, where reported ages at diagnosis had ranged from 1 month to 53 years. A 2025 case report in BMC Pulmonary Medicine on a 17-year-old wrote that in most cases the disease progresses to chronic illness or even death.
The disease can also turn dangerous quickly. In one case of a 22-year-old man whose chest CT had shown an abnormality for years, sudden bleeding into the airways led to acute respiratory failure before DPL was confirmed by surgical lung biopsy.
That makes this 79-year-old patient unusual twice over. He developed a disease typically diagnosed decades earlier in life, and his course ran in the opposite direction from the progressive decline often described.
Symptoms Gone in Three Weeks
According to the report, his symptoms resolved within three weeks without DPL-directed therapy. Follow-up CT at two months showed marked shrinkage of the enlarged lymph nodes and complete resolution of the septal thickening. He had no clinical or radiological recurrence over one year of follow-up.
The published abstract does not explain why the disease regressed, and a single case cannot answer that question. The article was also released as an early accepted version, which the publisher says may receive further edits before its final form.
The authors' conclusion was pointed. DPL, they wrote, can closely mimic advanced lung cancer with lymphatic spread on imaging while following a potentially reversible course, and awareness of it is essential to avoid misdiagnosis and unnecessary aggressive treatment, particularly in atypical settings and in older patients.
Why Tissue, Not Just Scans, Decided This Case
The case shows why doctors seek a tissue diagnosis before starting cancer treatment, even when imaging looks convincing. Had the scans alone been taken as proof of metastatic cancer, a 79-year-old man could have faced treatment for a disease he did not have.
It also shows the limits of that process. The first two biopsies failed, and a surgical procedure was needed. For older patients, that decision involves real trade-offs, but here it changed the diagnosis entirely.
Cancer mimics are a recurring theme in lung medicine. Infections and inflammatory conditions can produce masses and patterns that resemble cancer on CT or PET scans, and MedicalDaily recently reported on a rib growth that looked like a lung tumor on a chest X-ray. Patients told that imaging suggests cancer can expect their care team to seek confirmation through biopsy and can ask what alternatives remain possible until that result is in.
Most lung findings that look like cancer on imaging still need careful evaluation, and this report does not change that. What it adds is a rare, documented example of a frightening scan that described a condition which largely resolved without targeted treatment.
Key Questions Answered
What did the man's scans show?
A lung nodule, widespread enlarged lymph nodes in the chest, fluid and thickening around the lungs, and thickened lung partitions, a pattern that raised suspicion of advanced lung cancer.
What was the actual diagnosis?
Diffuse pulmonary lymphangiomatosis, an extremely rare disorder involving an abnormal overgrowth of lymphatic vessels in the lungs and chest.
How was it diagnosed?
A needle sampling of lymph nodes and a pleural biopsy were inconclusive, so surgeons removed a small wedge of lung. Special stains confirmed the lymphatic disorder.
What happened after diagnosis?
His symptoms resolved within three weeks without disease-specific treatment. Scans at two months showed major improvement, with no recurrence over one year.
Is this condition usually seen in older adults?
No. Earlier reports describe it mostly in children and young adults, often with a progressive course.
Does this mean suspicious lung scans are often not cancer?
No. Suspicious findings still require careful evaluation. This case shows why doctors confirm a diagnosis with tissue before treatment.
Published by Medicaldaily.com
