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Differentiation of idiopathic pulmonary hemosiderosis from rheumatologic and autoimmune diseases causing diffuse alveolar hemorrhage: establishing a diagnostic approach

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Abstract

This narrative review provides an overview of diffuse alveolar hemorrhage (DAH) associated with rheumatologic and autoimmune diseases and their differentiation from idiopathic pulmonary hemosiderosis (IPH). Relevant immunologic diseases associated with DAH are discussed, and a diagnostic flowchart is proposed to establish a “definitive” diagnosis of IPH within the spectrum of DAH. IPH is a rare cause of recurrent DAH both in children and adults. In adults, a definitive diagnosis of IPH requires a lung biopsy and histopathologic examination demonstrating intraalveolar hemorrhage, hemosiderin-laden macrophages, and a variable degree of fibrosis in the absence of both capillaritis and cellular inflammation. The presence of small vessel vasculitis points towards immunologic, well-differentiated, or sometimes undifferentiated rheumatologic diseases. However, it is essential to recognize that many rheumatologic diseases may in the initial phase present with DAH without any evidence of capillaritis, thus mimicking IPH. Although not definitely established, it is likely that immunologic processes are involved in IPH, and we, therefore, suggest the consideration of a more suitable term for the disease, e.g., “Immune-mediated Pulmonary Hemosiderosis” to acknowledge the aberrancy in the immune parameters and a positive response to immunosuppressive therapy.

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Abbreviations

AAV :

ANCA-associated vasculitis

ANA:

Antinuclear antibody

ANCA:

Anti-neutrophil cytoplasmic antibody

BAL:

Bronchoalveolar lavage

BH:

Bland pulmonary hemorrhage

c-ANCA:

Cytoplasmic anti-neutrophil cytoplasmic antibody

CPK:

Creatine phosphokinase

CTD:

Connective tissue disease

DAD:

Diffuse alveolar damage

DAH:

Diffuse alveolar hemorrhage

DM:

Dermatomyositis

GCA:

Giant cell arteritis

IPH:

Idiopathic pulmonary hemosiderosis

LVV:

Large vessel vasculitis

MVV:

Medium vessel vasculitis

PAN:

Polyarteritis nodosa

p-ANCA:

Perinuclear anti-neutrophil cytoplasmic antibody

PM:

Polymyositis

RD:

Rheumatologic disease

SLE:

Systemic lupus erythematosus

TAK:

Takayasu arteritis

VATS:

Video-assisted thoracoscopic surgery

VVV:

Variable vessel vasculitis

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Saha, B.K., Chong, W.H. & Milman, N.T. Differentiation of idiopathic pulmonary hemosiderosis from rheumatologic and autoimmune diseases causing diffuse alveolar hemorrhage: establishing a diagnostic approach. Clin Rheumatol 41, 325–336 (2022). https://doi.org/10.1007/s10067-021-05895-1

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