Dermoscopy of primary cutaneous B- and T-cell lymphomas and pseudolymphomas presenting as solitary nodules and tumors: a case-control study with histopathologic correlation.

BACKGROUND: Primary cutaneous lymphomas (PCLs) and pseudolymphomas presenting as single pink-red nodules/tumors are highly unspecific and include a wide differential diagnosis. OBJECTIVE: To describe the dermoscopic characteristics of PCL/pseudolymphoma. METHODS: In this retrospective, case-control study, we evaluated the dermoscopic features of patients with solitary PCL/pseudolymphoma tumors and compared them to a control group of non-lymphomatous, nonpigmented, solitary tumors (e.g., basal cell carcinoma, amelanotic melanoma, etc). RESULTS: We included 14 patients with PCL/pseudolymphomas and 35 controls. T-cell and B-cell lymphoma proportions were 28.6% (n = 4) and 71.4% (n = 10), respectively. Compared to controls, most lymphomas presented dermoscopically with orange color (71.4% vs. 14.2%, P < 0.001), follicular plugs (85% vs. 2.8%, P < 0.001), and as  organized lesions (85% vs. 31.4%, P = 0.001). Coexistence of orange color and follicular plugs had an odds ratio (OR) of 2.8 (P < 0.001), highly suggestive of PCL . The kappa index for independent observers was 0.66, 0.49, 0.43 for orange background, follicular plugs, and organized lesion, respectively. Histopathologic correlation was performed in six PCL cases and showed dense diffuse and perifollicular lymphocytic infiltrate in all cases and keratin plugs in five of six cases, possibly correlating with the orange color and the follicular plugs, respectively. CONCLUSION: Primary cutaneous lymphomas/pseudolymphomas present with characteristic dermoscopic findings irrespective of immunohistochemical subtype.

[Hypothalamic intravascular B-cell lymphoma in an immunocompetent patient]. / Linfoma B intravascular hipotalamico en una paciente inmunocompetente.

TITLE: Linfoma B intravascular hipotalamico en una paciente inmunocompetente.

Monoartritis del codo e infarto óseo como presentación inicial de enfermedad linfoproliferativa / Elbow monoarthritis and bone infarction as a form of presentation of B cell lymphoma: case report

We report a 68-year-old woman presenting with pain and swelling in her left elbow. An elbow magnetic resonance with gadolinium evidenced bone marrow infiltration and a bone infarct. Given these findings, a body CT scan was performed which showed multiple mesenteric adenopathies and a large retroperitoneal mass. A lymph node biopsy confirmed a B cell lymphoma. Monoarthritis with no systemic manifestations represents a highly uncommon form of presentation of lymphoma. Moreover it usually affects inferior limbs, particularly in the presence of bone infarction.

Difficult Diagnosis between B Cell Lymphoma and Classical Hodgkin's Lymphoma.

Although primary mediastinal large B-cell lymphoma and classic Hodgkin lymphoma of nodular sclerosis type are distinct disease, they share several clinical characteristics and biologic features. However, there are mediastinal lymphomas that not fit in either category. These types of lymphomas are recognized as mediastinal gray zone lymphomas. Gray zone lymphomas are lymphatic tumors that cannot be assigned to a defined lymphoma entity due to morphological, clinical, or genetic reasons. In this report, we present a case of a 22 year-old-Hispanic-female diagnosed with B-cell lymphoma, unclassifiable, with features intermediate between diffuse large B-cell lymphoma and Hodgkin lymphoma.

[Primary lymphoma of pancreas]. / Linfoma primario de páncreas.

Pcreas lymphoma is very rare, we report a 29 years old man, treated at Daniel A. Carrion Hospital. He presented jaudince and abdominal pain . Ecography and tomography showed a mass in pcreas head . the patient underwent pancreaticoduodenectomy. The final diagnosis was Large B cell diffuse lymphoma. CD 20 +, CD3 -, CD45 + without extrapancreatic disease, ACE -. We report the case and literature review.

Extranodal B-cell lymphoma of the uvea: a case report.

CASE REPORT: Ocular involvement by non-Hodgkin's lymphoma is a rare condition that can result from a primary intraocular lymphoma of the retina or an intraocular manifestation of systemic lymphoma. Uveal involvement is seldom the initial manifestation of extranodal lymphoma. We describe an 80-year-old patient with a blind and painful left eye and a history of recurrent uveitis. After ultrasound evaluation, the eye was enucleated and histopathologic examination revealed a malignant B-cell lymphoma of the uveal tract. The patient has been followed for 8 years after surgery, but she has had no further systemic manifestations of lymphoma and has not required subsequent treatment. COMMENTS: Primary extranodal lymphoma can be easily mistaken for recurrent uveitis or primary intraocular lymphoma of the retina and central nervous system; it is a differential diagnosis to be considered in cases of recurrent uveitis-like symptoms evolving to blind painful eye.