![A 40-year-old man, 4 years status after single-lung transplant on tacrolimus, presented with cervical lymphadenopathy. A lymph node biopsy showed a diffuse monotonous infiltrate of medium-sized lymphoid cells with regular nuclei, finely clumped chromatin, multiple small basophilic nucleoli, and squared-off cytoplasmic borders in a starry-sky background highly reminiscent of Burkitt lymphoma (BL) (panel A, 40× objective, original magnification ×400; hematoxylin and eosin stain). However, flow cytometry detected an abnormal immature T-cell population positive for CD34, cyCD3, CD2, CD5, CD7, and CD45 (panels B-E) but negative for CD10, terminal deoxynucleotidyl transferase, CD1a, and B-cell, myeloid (CD11c, CD13, CD33, and CD117) and other T-cell lineage–associated markers consistent with T lymphoblasts. Karyotype was abnormal: 46,XY,t(7;14)(p15;q32),del(9)(q21)[27]/46,XY[3]. Polymerase chain reaction analysis demonstrated a clonal T-cell receptor β gene rearrangement. T lymphoblasts involved <10% of the bone marrow and peripheral blood cellularity. All Epstein-Barr virus (EBV) study results were negative. Staging positron emission tomography/computed tomography scan showed a 5-cm anterior mediastinal mass. The clinicopathologic findings supported a monomorphic T-cell posttransplant lymphoproliferative disorder, T lymphoblastic lymphoma (T-LBL), EBV negative. The patient completed a hyper–cyclophosphamide, vincristine, doxorubicin, and dexamethasone chemotherapy regimen and is in remission.](https://ash.silverchair-cdn.com/ash/content_public/journal/blood/137/21/10.1182_blood.2021011188/1/m_bloodbld2021011188f1.png?Expires=1768802105&Signature=Kzi1a487kTnfNElJYMkNsmcavMrutjwyJiXirPtr~fgyYjVkotM1Eubl-TH~hTcIEbtdI98Lib4zK9jpbvjnQtedydkclgP30UWM-HaBGlZRrl1PXVdzmbUrEsUVn-nw~H2jcplXaR2ZMOIAaAAdslDkWom39k4dfbXahEntbZzAHCkc5PP2KM2R57s1YYTUPc1JQHd7AEFyETNca7rH8JPs2yN-sE27A-~niAbQOPPL0HaT4pS7boEiCNJ4t0P4Im9UxVR~WWd9k-g1OWsiGE32ZH4p5fyuwgb9Ju3D8ydRJuau1hFW5kHb1RxEfxOy6Q3V6xvOGDtc1MVN78Aqnw__&Key-Pair-Id=APKAIE5G5CRDK6RD3PGA)
A 40-year-old man, 4 years status after single-lung transplant on tacrolimus, presented with cervical lymphadenopathy. A lymph node biopsy showed a diffuse monotonous infiltrate of medium-sized lymphoid cells with regular nuclei, finely clumped chromatin, multiple small basophilic nucleoli, and squared-off cytoplasmic borders in a starry-sky background highly reminiscent of Burkitt lymphoma (BL) (panel A, 40× objective, original magnification ×400; hematoxylin and eosin stain). However, flow cytometry detected an abnormal immature T-cell population positive for CD34, cyCD3, CD2, CD5, CD7, and CD45 (panels B-E) but negative for CD10, terminal deoxynucleotidyl transferase, CD1a, and B-cell, myeloid (CD11c, CD13, CD33, and CD117) and other T-cell lineage–associated markers consistent with T lymphoblasts. Karyotype was abnormal: 46,XY,t(7;14)(p15;q32),del(9)(q21)[27]/46,XY[3]. Polymerase chain reaction analysis demonstrated a clonal T-cell receptor β gene rearrangement. T lymphoblasts involved <10% of the bone marrow and peripheral blood cellularity. All Epstein-Barr virus (EBV) study results were negative. Staging positron emission tomography/computed tomography scan showed a 5-cm anterior mediastinal mass. The clinicopathologic findings supported a monomorphic T-cell posttransplant lymphoproliferative disorder, T lymphoblastic lymphoma (T-LBL), EBV negative. The patient completed a hyper–cyclophosphamide, vincristine, doxorubicin, and dexamethasone chemotherapy regimen and is in remission.
T-LBL after solid-organ transplant is particularly rare compared with BL. Furthermore, this case displayed histologic features highly suggestive of BL, a diagnostic pitfall, illustrating the importance of a multiparametric diagnostic approach.
A 40-year-old man, 4 years status after single-lung transplant on tacrolimus, presented with cervical lymphadenopathy. A lymph node biopsy showed a diffuse monotonous infiltrate of medium-sized lymphoid cells with regular nuclei, finely clumped chromatin, multiple small basophilic nucleoli, and squared-off cytoplasmic borders in a starry-sky background highly reminiscent of Burkitt lymphoma (BL) (panel A, 40× objective, original magnification ×400; hematoxylin and eosin stain). However, flow cytometry detected an abnormal immature T-cell population positive for CD34, cyCD3, CD2, CD5, CD7, and CD45 (panels B-E) but negative for CD10, terminal deoxynucleotidyl transferase, CD1a, and B-cell, myeloid (CD11c, CD13, CD33, and CD117) and other T-cell lineage–associated markers consistent with T lymphoblasts. Karyotype was abnormal: 46,XY,t(7;14)(p15;q32),del(9)(q21)[27]/46,XY[3]. Polymerase chain reaction analysis demonstrated a clonal T-cell receptor β gene rearrangement. T lymphoblasts involved <10% of the bone marrow and peripheral blood cellularity. All Epstein-Barr virus (EBV) study results were negative. Staging positron emission tomography/computed tomography scan showed a 5-cm anterior mediastinal mass. The clinicopathologic findings supported a monomorphic T-cell posttransplant lymphoproliferative disorder, T lymphoblastic lymphoma (T-LBL), EBV negative. The patient completed a hyper–cyclophosphamide, vincristine, doxorubicin, and dexamethasone chemotherapy regimen and is in remission.
T-LBL after solid-organ transplant is particularly rare compared with BL. Furthermore, this case displayed histologic features highly suggestive of BL, a diagnostic pitfall, illustrating the importance of a multiparametric diagnostic approach.
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