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Amyloid Light Chain (AL) Amyloidosis is a rare disorder of protein misfolding and metabolism characterized by insoluble fibrils deposition in various tissues and organs, which could quickly progress and become fatal. The most frequently affected organ is heart being its involvement the most adverse prognostic feature. Kidney and liver could be other organ localizations, defining AL Amyloidosis as a multisystem disorder. Being Budd-Chiari syndrome (BCS) an uncommon congestive hepatopathy caused by blockage of hepatic veins in the absence of cardiac disorders, it could be rarely caused by a massive deposition of amyloid proteins into hepatic sinusoidal spaces, giving an uncommon clinical presentation of AL Amyloidosis., (© 2024. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)

Myeloproliferative neoplasms (MPNs) are the leading causes of unusual site thrombosis, affecting nearly 40% of individuals with conditions like Budd-Chiari syndrome or portal vein thrombosis. Diagnosing MPNs in these cases is challenging because common indicators, such as spleen enlargement and elevated blood cell counts, can be obscured by portal hypertension or bleeding issues. Recent advancements in diagnostic tools have enhanced the accuracy of MPN diagnosis and classification. While bone marrow biopsies remain significant diagnostic criteria, molecular markers now play a pivotal role in both diagnosis and prognosis assessment. Hence, it is essential to initiate the diagnostic process for splanchnic vein thrombosis with a JAK2 V617F mutation screening, but a comprehensive approach is necessary. A multidisciplinary strategy is vital to accurately determine the specific subtype of MPNs, recommend additional tests, and propose the most effective treatment plan. Establishing specialized care pathways for patients with splanchnic vein thrombosis and underlying MPNs is crucial to tailor management approaches that reduce the risk of hematological outcomes and hepatic complications.