Related Experiment Videos
Pulmonary tumor thrombotic microangiopathy
1First Department of Pathology, Miyazaki Medical College, Japan.
Abstract:
Pulmonary tumor thrombotic microangiopathy (PTTM) is characterized by widespread fibrocellular intimal proliferation of the small pulmonary arteries and arterioles in patients with metastatic carcinoma. Microscopic pulmonary tumor emboli have frequently occurred in patients with malignant tumors; however, few cases of PTTM have been reported. A rare case of a patient with gastric adenocarcinoma who presented with acute dyspnea and lethal respiratory failure is described. Histologically, diffuse fibromuscular intimal thickening causing luminal stenosis and obstruction but containing rather few cancer cells was observed in the small pulmonary arteries and arterioles. These findings were consistent with PTTM. Although PTTM is a rare phenomenon, PTTM should be considered in the differential diagnosis of acute dyspnea or pulmonary hypertension in patients with carcinoma.
Insights
Pulmonary tumor thrombotic microangiopathy (PTTM) is a rare condition causing lung artery narrowing in cancer patients. This case highlights PTTM as a crucial diagnosis for unexplained respiratory failure in carcinoma.
Area of Science:
- Oncology
- Pulmonary Medicine
- Pathology
Background:
- Pulmonary tumor thrombotic microangiopathy (PTTM) is a rare vascular complication of malignancy.
- It involves fibrocellular intimal proliferation in small pulmonary arteries and arterioles.
- PTTM is distinct from pulmonary tumor emboli, though both occur in cancer patients.
Observation:
- A case of gastric adenocarcinoma presented with acute dyspnea and respiratory failure.
- Histological examination revealed diffuse fibromuscular intimal thickening in small pulmonary arteries and arterioles.
- The thickened intimal layer caused significant luminal stenosis and obstruction.
Findings:
- The observed changes were consistent with pulmonary tumor thrombotic microangiopathy (PTTM).
- Cancer cells were present but sparse within the proliferating intimal tissue.
- The primary pathology was intimal hyperplasia rather than widespread tumor emboli.
Implications:
- PTTM should be considered in the differential diagnosis of patients with carcinoma presenting with acute dyspnea.
- Early recognition of PTTM is vital for appropriate patient management and can improve outcomes.
- This case underscores the diverse and sometimes subtle presentations of malignancy-associated complications.