Monoclonal gammopathy of clinical signifi cance with osteosclerotic lesions – a case report and a literature review

Czech version

Authors: Z. Adam ¹; Z. Řehák ²; M. Keřkovský ³; C. Povýšil ⁴; E. Ezer ⁵; A. Buliková ⁶; L. Pour ¹; M. Doubek ¹; Y. Stavařová ⁷; L. Zdražilová Dubská ⁸; P. Szutyany ⁹; S. Ševčíková ¹⁰; Z. Král ¹
Authors‘ workplace: Interní hematologická a onkologická klinika LF MU a FN Brno ¹; Oddělení nukleární medicíny, MOU Brno ²; Klinika radiologie a nukleární medicíny LF MU a FN Brno ³; Ústav patologie, 1. LF UK a VFN v Praze ⁴; Oddělení patologie, Krajská nemocnice T. Bati, Zlín ⁵; Oddělení klinické hematologie, Interní hematologická a onkologická klinika LF MU a FN Brno ⁶; Oddělení klinické hematologie, Krajská nemocnice Tomáše Bati, Zlín ⁷; Katedra laboratorních metod, Ústav laboratorní medicíny, LF MU a FN Brno ⁸; Oddělení zobrazovacích metod, Krajská nemocnice T. Bati, Zlín ⁹; Ústav patologické fyziologie, LF MU Brno ¹⁰
Published in: Klin Onkol 2024; 38(3): 209-219
Category: Case Reports
doi: https://doi.org/10.48095/ccko2024209

Overview

Introduction: Multiple myeloma is a common plasma cell neoplasia usually accompanied by the formation of osteolytic foci, whereas osteosclerotic myeloma is a very rare form of plasma cell dyscrasia. When osteosclerotic myeloma is detected, osteosclerotic foci are usually part of the POEMS syndrome. Osteosclerotic myeloma without other manifestations of the POEMS syndrome is an unusual finding. Case description: In a 46-year-old woman, osteosclerotic changes of the temporoparietal region caused soft tissue induration over this lesion, which initiated further investigation. Imaging studies subsequently showed multiple osteosclerotic foci in the skull. Examination of blood proteins revealed 8 g/L of IgG-lambda monoclonal immunoglobulin, subclass IgG1. In search of the cause of the osteosclerotic changes, FDG-PET/CT was performed, which revealed no FDG accumulation, i.e., no other tumor (breast or stomach cancer). Low-dose CT showed irregular bone structure, but not significant osteolytic or osteosclerotic foci. To map the extent of osteosclerotic changes, NaF-PET/CT imagination followed, which revealed multiple spots with high fluoride accumulation. A parietal bone biopsy showed osteosclerosis with minor clonal plasma cell infiltration. Trepanobioptic bone marrow sampling revealed an infiltration of bone marrow with atypical plasma cells in 8%. Flow-cytometric examination of bone marrow showed 0,37% of plasma cells, however predominantly (91%) clonal with lambda expression. MRI of the brain identified asymptomatic meningeal thickening. There was no evidence of POEMS syndrome in the patient; thus, we concluded the diagnosis as monoclonal gammopathy of clinical significance with osteosclerosis which was previously termed osteosclerotic multiple myeloma. Conclusion: Monoclonal gammopathy of clinical significance (MGCS) with osteosclerotic skeletal changes, documented on CT and multiple foci with intensive osteoneogenesis, documented on NaF-PET/CT without evidence of POEMS syndrome, is an extremely rare form of plasma cell dyscrasia. This publication documents the unique clinical manifestations of IgG-lambda type plasma cell proliferation without signs of POEMS syndrome and the role of NaF-PET/CT imaging. Classification of this disease as MGSC with osteosclerotic manifestations is more consistent with the indolent nature of the disease with a significantly better prognosis, compared with multiple myeloma.

Keywords:

POEMS syndrome – osteosclerotic myeloma – monoclonal gammopathy of clinical significance (MGCS) with osteosclerosis – osteosclerosis

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Clinical Oncology

2024 Issue 3