Indolent T-lymphoblastic proliferation concomitant to acinic cell carcinoma mimicking T-lymphoblastic lymphoma: case report and literature review

Abstract

Aims

Indolent T-lymphoblastic proliferation (iT-LBP) is a non-clonal benign condition showing extrathymic proliferation of T-lymphoblasts positive for CD3, CD4, CD8, and TdT. Isolated iT-LBP has been observed, but the majority of iT-LBP have been seen in conjunction with other disorders including Castleman disease, hepatocellular carcinoma, follicular dendritic cell tumors, angioimmunoblastic T-cell lymphoma, myasthenia gravis, and acinic cell carcinoma (ACC). The clinical course of iT-LBP is indolent, and no therapy is usually required. A major concern is misdiagnosis for T-lymphoblastic lymphoma, and a correct diagnosis of iT-LBP often requires not only pathological analysis but also a cautious monitoring of the clinical course. The aim of this report is to broaden knowledge of this yet not well recognized entity to pathologists and physicians

Methods and Results

We report a case of iT-LBP concomitant to ACC, along with a literature review of all 14 cases of iT-LBP reported to date

Conclusions

iT-LBP should always be considered as a differential diagnosis of T-lymphoblastic lymphoma as the two disorders show extremely resembling traits.

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