eISSN: 2084-9869
ISSN: 1233-9687
Polish Journal of Pathology
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SCImago Journal & Country Rank
4/2018
vol. 69
 
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abstract:
Original paper

Various patterns of acute alveolar haemorrhage in patients with microscopic polyangiitis: a clinicopathological study of four cases

Naoto Kuroda, Kenji Yorita, Kei Sakamoto, Kazuya Tsuji

Pol J Pathol 2018; 69 (4): 384-387
Online publish date: 2019/01/31
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It is well known that acute alveolar haemorrhage (AAH) is attributed to capillaritis in most cases with microscopic polyangiitis (MPA). In this article, we explore the cause of alveolar haemorrhage in MPA patients. In the present study, we extracted four autopsy cases of MPA with AAH. Patient’s sex and age, cause of alveolar haemorrhage, therapy, follow-up duration, and cause of death were investigated. As a result, alveolar haemorrhage was caused by diffuse alveolar damage (DAD) due to candidiasis or influenza virus infection, haemorrhagic infarct due to aspergillosis, capillaritis due to MPA, vasculitis due to cytomegalovirus (CMV), and herpes simplex virus (HSV) infection. All patients received corticosteroid therapy, and one patient additionally underwent administration of cyclophosphamide. The duration of follow-up ranged from one to 26 months with a mean of eight months. All patients died of respiratory failure. In summary, clinicians and pathologists should recognise some causes of alveolar haemorrhage in MPA patients, which include DAD, haemorrhagic infarct, virus-associated vasculitis, or MPA-associated capillaritis.
keywords:

alveolar haemorrhage, microscopic polyangiitis

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