Fissural pseudotumour or vanishing tumour seen in congestive heart failure.
- “Vanishes” after treatment with diuretic
Important to distinguish from other causes of consolidation !
- Round pneumonia
- The key is the border of the consolidation.
- If the border is poorly defined, it means that the consolidation in intraparenchymal. Most likely infection or malignancy.
- If the border is well defined, it means that the consolidation in surrounded by pleura. Intrafissural malignancy or infection is really rare.
- Other feature: tapering end of the “tumour”.
Other ddx for “pseudotumour”
- Other types of pleural effusion eg tuberculous effusion
- Pulmonary inflammatory pseudotumour
– benign pulmonary parenchymal mass lesions, which occur as a result of an inflammatory reaction probably due to respiratory infection
– needs surgical excision
- Rounded atelectasis