Discussion
Diagnosis With Brief Discussion
- Diagnosis
- Paragonimiasis
- Radiologic Findings
- Figure 1. Chest PA shows ill-defined patchy increased opacity in left upper lung zone. Bilateral pleural effusion is also noted.
Figure 2-3. Axial CT images show patchy consolidations and surrounding ground glass opacities in left upper lobe subpleural area.
Figure 4. Axial CT image at lower level shows ill-defined patchy area of subpleural consolidation with GGOs and mild pneumothorax in LUL.
Figure 5. Coronal CT image shows multifocal consolidations with GGOs in BULs and pneumothorax in left lung.
Figure 6. After 5 days of albendazole treatment, follow up axial CT image shows decreased extent of previous lesions but remnant lesion which looks like worm migration track is seen. Bilateral pleural effusion is newly developed.
- Brief Review
- He had history of frequent ingestion of raw freshwater crab or crayfish and abnormal lab finding such as eosinophilia in peripheral blood examinations.
Pulmonary paragonimiasis is a food-borne parasitic disease caused by the lung fluke Paragonimus westermani, which is endemic in Southeast Asia and the Far East. It has a complex life cycle and ingested metacercariae excyst in the small intestine, migrate through the intestinal wall and enter the abdominal cavity. Next they penetrate the diaphragm and pleura and enter the lung in three to eight weeks, where they develop into the adult worms.
Typical pulmonary symptoms are fever, chest pain, and respiratory symptoms, including a chronic cough with homoptysis. Peripheral blood examinations can show leukocytosis and eosinophilia in many patients.
Paragonimiasis may be categorized into pulmonary, pleuropulmonary and extra-pulmonary forms. Radiographically, paragonimiasis is dependent on which stage in the development of the disease has been currently reached. The most common manifestation observed was pleural lesions from simple pleural thickening to bilateral hydropneumothorax. The characteristic CT features of pulmonary paragonimiasis were round low attenuation cystic lesions filled with fluid or gas. CT scan also showed air-space consolidation, nodules, worm migration track, and bronchiectasis. The prevalence of pleural effusion varies.
The diagnostic criteria of paragonimiasis are based on clinical history, radiological findings, absolute eosinophilia, positive findings on a serological test, or detection of eggs or worms in sputum or bronchoalveolar lavage (BAL) fluid or stool or in a pathologic specimen. A specific IgG antibody test using the ELISA is helpful both in suggesting a diagnosis and in ruling out infections. Praziquantel is the drug of choice for both pulmonary and extra-pulmonary paragonimiasis.
- References
- 1. Jeon K, Koh W, Kim H, Kwon OJ, Kim TS, Lee K, et al. Chest 2005; 128:1423-1430
2. Kim TS, Han J, Shim SS, Jeon K, Koh WJ, Lee I, et al. AJR 2005; 185:616-621
3. Shambhu KS, Silin D, Yi L, Ping Y, Oormila G, Manu C, et al. Radiology of Infectious Diseases 2016;3:66-73
4. KN Jeon, MJ Park, KS Bae, HY Choi, HC Choi, JB Na, et al. J Korean Soc Radiol 2013;69:365-371
- Keywords
- Lung, Pleura, Infection, Parasite,