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25 November 2017 : Case report  USA

Diffuse Peritoneal and Bowel Wall Infiltration by Light Chain-AL Amyloidosis with Omental Calcification Mimicking Abdominal Carcinomatosis – An Elderly Female with Incidental Finding of Light Chain Monoclonal Gammopathy of Undetermined Significance (LC-MGUS)

Challenging differential diagnosis, Educational Purpose (only if useful for a systematic review or synthesis), Rare coexistence of disease or pathology

Shoaib Junejo1ACDEF*, Yasir Ali2ACDEF, Sandeep Singh Lubana1A, Sandeep S. Tuli1AE

DOI: 10.12659/AJCR.907041

Am J Case Rep 2017; 18:1247-1250

Abstract

BACKGROUND: Amyloidosis is the extracellular tissue deposition of plasma proteins, which after conformational changes, forms antiparallel beta pleated sheets of fibrils. Amyloid light-chain (AL) is a type of amyloidosis that is due to deposition of proteins derived from immunoglobulin (Ig) light chains. Gastrointestinal tract (GIT) involvement most often found in amyloid A (AA) amyloidosis type. There have been no reports of obstructive GIT AL amyloid patients having monoclonal gammopathy of undetermined significance (MGUS). Our case is the first case to show two coinciding conditions; one is the association of GIT AL amyloidosis with the incidental finding of a rare type of MGUS (LC-MGUS) and the other is the radiologic presentation of GIT amyloidosis with omental calcification mimicking the GIT malignancy.

CASE REPORT: A 68-year-old female presented with symptoms of partial bowel obstruction, including intermittent diffuse abdominal pain and constipation. After computed tomography (CT) abdomen and pelvis, an exploratory laparotomy was needed because of suspicion of abdominal carcinomatosis due to diffuse omental calcification. The tissue sent for biopsy surprisingly showed AL amyloidosis. The patient did not report any systemic symptoms. Further workup was advised to inquire about the plasma cell dyscrasia which eventually turned into a very rare version of MGUS knows as light chain MGUS (LC-MGUS). Following adequate resection of the involved structures, the patient was then placed on chemotherapy and successfully went into remission.

CONCLUSIONS: This case report illustrates that in an era of evidence based medicine, it is important to show through case reports the association of GIT AL amyloidosis with LC-MGUS, as the literature on this topic is lacking. It also points to the importance of timely intervention that can greatly enhance, not only the only the chances of remission but also prevention of further complications such as malignant transformation.

Keywords: Amyloidosis, Gastrointestinal Neoplasms, Immunoglobulin Light Chains, monoclonal gammopathy of undetermined significance

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American Journal of Case Reports eISSN: 1941-5923
American Journal of Case Reports eISSN: 1941-5923