Foliculitis pseudolinfomatosa de McNutt (localización nasal) / McNutt's pseudolymphomatous folliculitis (nasal located)

La foliculitis pseudolinfomatosa, descripta por McNutt en 1986, es una afección de etiología desconocida y poco frecuente, que simula un linfoma cutáneo tanto por su clínica como por su histología. Se presenta como una lesión nodular solitaria, eritematosa, de 0,5 hasta 3cm, de crecimiento rápido, sobre todo en la cara, en personas de 40 a 60 años, con una histopatología caracterizada por un infiltrado linfocitario B yT perifocular, y células dendríticas positivas en la inmunohistoquímica para S100yCD1a. Su curso es benigno, muchas veces autolimitado. Se expone el caso de una paciente con una particular forma clínica de pseudolinforma.

Pseudolymphomatous folliculitis, described by McNutt in 1986, is a non-frequent entity of unknown etiology that simulates a cutaneous lymphoma, both clinically and histologically. It shows as a solitary erythematous nodular lesion of 0.5 to 3 cm, with a rapid growth, mainly on the face, in people aged 40 to 60 years, and histopathology characterized by a perifollicular B and T lymphocytic infiltrate, and positive dendritic cells for immunohistochemistry S100 and CD1a. Its course is benign, often self-limited. The case of a patient with a particular clinical form of pseudolymphoma is presented.

Rosettes in T-cell pseudolymphoma: a new dermoscopic finding

Abstract Rosettes are small white structures visible with polarized light dermoscopy, whose exact morphological correlation is not yet defined. These small shiny structures are found in several conditions such as scarring, dermatofibroma, molluscum contagiosum, squamous cell carcinoma, basal cell carcinoma, melanoma, melanocytic nevus, discoid lupus erythematosus, and papulopustular rosacea. In this novel report, the authors describe the presence of rosettes in a T-cell pseudolymphoma lesion.

Estudios de laboratorio como herramienta en la identificación de apendicitis aguda y su diferenciación con hiperplasia linfoide / Laboratory studies as a tool for the differential diagnosis between acute appendicitis and lymphoid hyperplasia

RESUMEN Antecedentes: La apendicitis aguda (AA) es una de las principales patologías quirúrgicas en México y el mundo. A pesar de ser una patología frecuente, el manejo quirúrgico presenta una tasa del 10-20% de apendicitis blancas (AB) o hiperplasia folicular linfoide (HPL) por histopatología. Objetivo: Comparar los hallazgos clínicos, de laboratorio y radiológicos de pacientes con sospecha de AA con su diagnóstico por histopatología. Material y métodos: El estudio es retrospectivo, observacional y transversal. Se analizaron los datos de los pacientes con diagnóstico clínico de apendicitis aguda, desde febrero de 2013 hasta diciembre de 2017, atendidos en un hospital de tercer nivel en Monterrey, México. Se compararon los hallazgos de los pacientes con diagnóstico de AA vs. HPL, AA no complicadas vs. AA complicadas y pacientes pediátricos vs. adultos. Se realizó un análisis descriptivo por medio de frecuencias y porcentajes, y mediana y rango intercuartil (RIC), dada la distribución no paramétrica de estas variables. Se compararon los hallazgos por laboratorio mediante la prueba de Mann-Whitney. Se consideró una p< 0,05 como estadísticamente significativa. Resultados: En nuestro medio, ambos sexos tienen la misma frecuencia de presentación de AA. El tiempo de evolución es significativo en la presentación frecuente de AA complicada. Existe asociación entre leucocitosis, neutrofilia total y porcentual y recuento plaquetario mayor en presencia de AA vs. HPL. Conclusión: Los estudios de laboratorio no muestran cambios significativos en pacientes pediátricos con AA. En adultos con AA no complicada vs. apendicitis complicada, el aumento en WBC, NEU y NEU% son estadísticamente significativos.

ABSTRACT Background: Acute appendicitis (AA) is one of the main surgical pathologies in our country and worldwide. Despite being a surgery that is frequently done, it is still reported a 10-20% of negative appendectomies (NA). Objective: The objective of the study is to compare clinical, laboratory and radiology results with the histopathology diagnosis. Material and methods: A retrospective study was done analyzing the data of patients with clinical diagnosis of AA from February 2013 to December 2017, in a tertiary hospital in Monterrey, Mexico. They were classified by their histopathological results into different groups: AA or NA; and the AA was subdivided into complicated AA and uncomplicated AA. Finally, these groups were also subdivided by ages, into pediatric and adult groups of each category. A descriptive analysis was made using frequencies, percentages, median and the interquartile range. Laboratory results were compared with the Mann-Whitney test. Considering a p-value of p < 0.05 as statistically significant. Results: In our group of patients both genders had AA in a similar frequency, the time between the appearance of symptoms and reaching for medical advice was an important factor for having complicated AA. There is a correlation between leukocytosis, neutrophil count and platelet count elevated in presence of AA against NA. Conclusion: Laboratory studies did not report significant changes in pediatric patients with AA. In adults with uncomplicated AA vs. complicated AA, white blood cell count, and neutrophil count are statistically significant.

Expression of TOPK/PBK in children with malignant lymphoma or reactive lymphoid hyperplasia / 中国当代儿科杂志

<p><b>OBJECTIVE</b>To study the difference in expression of TOPK/PBK in lymph nodes between children with malignant lymphoma and those with reactive lymphoid hyperplasia.</p><p><b>METHODS</b>Eighty children with malignant lymphoma and twenty children with reactive lymphoid hyperplasia were enrolled as subjects. Immunohistochemistry was used to determine the expression of TOPK/PBK in all the subjects. The expression of TOPK/PBK was compared between the two groups.</p><p><b>RESULTS</b>The TOPK/PBK-positivity rate was significantly higher in children with malignant lymphoma than in those with reactive lymphoid hyperplasia (P<0.05). There was no significant difference in the TOPK/PBK-positivity rate between the children with Hodgkin's lymphoma and non-Hodgkin's lymphoma (NHL). There were significant differences in the TOPK/PBK-positivity rate among children with different pathological types of NHL (P<0.05): the children with lymphoblastic lymphoma showed the highest TOPK/PBK-positivity rate and those with mature B-cell lymphoma and mature T/NK-cell lymphoma had a similar TOPK/PBK-positivity rate.</p><p><b>CONCLUSIONS</b>The expression of TOPK/PBK is up-regulated in the lymph nodes of children with malignant lymphoma. The expression level of TOPK/PBK may be related to the pathological type of NHL.</p>

Pulmonary Nodular Lymphoid Hyperplasia with Mass-Formation: Clinicopathologic Characteristics of Nine Cases and Review of the Literature

BACKGROUND: Pulmonary nodular lymphoid hyperplasia (PNLH) is a non-neoplastic pulmonary lymphoid disorder that can be mistaken for malignancy on radiography. Herein, we present nine cases of PNLH, emphasizing clinicoradiological findings and histological features. METHODS: We analyzed radiological and clinicopathological features from the electronic medical records of nine patients (eight females and one male) diagnosed with PNLH. IgG and IgG4 immunohistochemical staining was performed in three patients. RESULTS: Two of the nine patients had experienced tuberculosis 40 and 30 years prior, respectively. Interestingly, none were current smokers, although two were ex-smokers. Three patients complaining of persistent cough underwent computed tomography of the chest. PNLH was incidentally discovered in five patients during examination for other reasons. The remaining patient was diagnosed with the disease following treatment for pneumonia. Imaging studies revealed consolidation or a mass-like lesion in eight patients. First impressions included invasive adenocarcinoma and mucosal-associated lymphoid tissue‒type lymphoma. Aspergillosis was suspected in the remaining patient based on radiological images. Resection was performed in all patients. Microscopically, the lesions consisted of nodular proliferation of reactive germinal centers accompanied by infiltration of neutrophils and macrophages in various degrees and surrounding fibrosis. Ultimately, all nine patients were diagnosed with PNLH and showed no evidence of recurrence on follow-up. CONCLUSIONS: PNLH is an uncommon but distinct entity with a benign nature, and understanding the radiological and clinicopathological characteristics of PNLH is important.

Cutaneous Pseudolymphoma Derived from Ruptured Milia

No abstract available.

Red nodule on the face with "spontaneous" regression

Abstract Pseudolymphomatous folliculitis is a rare entity included among the cutaneous pseudolymphomas. A 32-year-old man, with an unremarkable medical history, presented with a two-month history of an asymptomatic solitary nodule on his left cheek. Histopathological examination demonstrated a dense nodular and diffuse dermal lymphocytic infiltrate with numerous histiocytes and dendritic cells that surrounded hypertrophic hair follicles. Pseudolymphomatous folliculitis commonly presents in the fourth decade of life, with no sex predominance, as an asymptomatic, rapidly growing and solitary red dome-shaped nodule on the face. It has a benign clinical course as the lesions usually resolve with surgical excision or regress spontaneously after incisional biopsy. Although there is no report of pseudolymphomatous folliculitis progressing into lymphoma in the literature, follow-up of these patients is recommended.

Lymphocytoma cutis on the inguinal region: report of a rare case of benign lymphoproliferative disorder

Abstract Lymphocytoma cutis, or benign reactive lymphoid hyperplasia, is an inflammatory skin lesion that mimics clinically and histologically malignant lymphoma. Most cases are idiopathic, but they may also be triggered by multiple factors, such as insect bites, tattoos, injections and herpes zoster. Clinically, the lesions are erythematous, soft papules, plaques or nodules, usually located on the upper limbs and face. The diagnosis is mainly based on histopathology and immunohistochemistry. Corticosteroid injections, cryosurgery, PUVA therapy, radiotherapy and surgery can be therapeutic options in cases requiring immediate treatment. To demonstrate an atypical presentation of this tumor, a case lymphocytoma skin on the groin will be reported, describing its diagnosis and treatment.

Multifocal nodular lymphoid hyperplasia of the lung / 영남의대학술지

Nodular lymphoid hyperplasia (NLH) is a benign lymphoproliferative disease that can affect the lung. Because of its rarity, little is known about the etiology and natural history of NLH. Most cases are usually asymptomatic and found incidentally on imaging studies. Imaging finding of NLH has shown most commonly as a solitary lesion, although multifocal pulmonary nodules may be seen. Surgical resection has proved curative in the cases previously described. We report a rare case of NLH in a 55 year-old man who presented with bilateral multiple pulmonary nodules on chest radiography. Open biopsy was performed from the upper and lower lobe of the left lung. The lesions were pathologically diagnosed as pulmonary NLH. Multifocal residual nodules in both lungs remain stable without spontaneous regression during the 3 years of follow-up.

Multifocal nodular lymphoid hyperplasia of the lung / 영남의대학술지

Nodular lymphoid hyperplasia (NLH) is a benign lymphoproliferative disease that can affect the lung. Because of its rarity, little is known about the etiology and natural history of NLH. Most cases are usually asymptomatic and found incidentally on imaging studies. Imaging finding of NLH has shown most commonly as a solitary lesion, although multifocal pulmonary nodules may be seen. Surgical resection has proved curative in the cases previously described. We report a rare case of NLH in a 55 year-old man who presented with bilateral multiple pulmonary nodules on chest radiography. Open biopsy was performed from the upper and lower lobe of the left lung. The lesions were pathologically diagnosed as pulmonary NLH. Multifocal residual nodules in both lungs remain stable without spontaneous regression during the 3 years of follow-up.

Pathologic Evaluation of Routine Nasopharynx Punch Biopsy in the Adult Population: Is It Really Necessary?

OBJECTIVES: To retrospectively evaluate the patients who underwent nasopharyngeal biopsy with imaging and biopsy results, who have or don’t have symptoms for nasopharyngeal pathology and to determine the ratio of the nasopharyngeal cancer cases and other pathologic conditions. METHODS: In this retrospective study, 983 patients who underwent endoscopic nasopharyngeal biopsy for symptomatic nasopharyngeal lesions were included. All pathological results, benign or malign was recorded and classified due to the patients’ presenting symptoms such as symptomatic for nasopharyngeal pathology or asymptomatic. Computed tomography (CT) or magnetic resonance imaging (MRI) reports were also recorded separately as group A for malignancy or group B for not malignancy. RESULTS: Forty-five (4.6%) of 983 biopsies were malignant. In this group, there is no statistically significant difference between symptomatic and asymptomatic group. For malignant pathologies, the sensitivity of MRI was found 88.2% and CT was 61.5%. CONCLUSION: For early diagnosis of nasopharyngeal cancer, all patients admitted to Ear, Nose and Throat (ENT) referral clinics should be examined endoscopically irrespective of their complaints and suspicious cases should be investigated by imaging especially by MRI. If MRI report clearly indicates Thornwaldt cyst or reactive lymphoid hyperplasia and this result is compatible with endoscopic findings, biopsy may not be necessary. Apart from these cases, all suspected lesions should be biopsied.

Microscopic analysis of patients with chronic diarrhea without macroscopic disease / Análise microscópica de pacientes com diarreia crônica sem doença macroscópica

BACKGROUND: Colonoscopy is part of the current diagnostic armamentarium. However, in some patients with chronic diarrhea, a colonoscopy may show normal mucosa; in these cases, serial biopsies can provide important information for the diagnosis and treatment of patients. AIM: To analyze patients with chronic diarrhea having a macroscopically normal colonoscopy, by evaluating histological changes. METHODS: 30 patients with chronic diarrhea and normal colonoscopy were prospectively evaluated and submitted to serial biopsies of the terminal ileum, ascending colon and rectum. RESULTS: The sample of 30 patients showed a ratio of 18 men (60%) and 12 women (40%). On histological types, it was found that 13 patients (43.3%) had lymphoid hyperplasia, eosinophilic inflammation in 4 (13.3%), nonspecific inflammation in 4 (13.3%), regenerative changes in 3 (10%), lymphocytic colitis in 2 (6.6%) and changes consistent with Crohn's disease in 1 (3.3%). CONCLUSIONS: One can observe that even chronic diarrhea patients, without other associated factors, benefited from colonoscopy with biopsy, because it held the etiologic diagnosis in some cases as also excluded by histopathology. It was noticed that the frequency of patients with altered biopsy and less dragged diarrheal episodes (84.2%) was large, should consider their achievement.

INTRODUÇÃO: A colonoscopia faz parte do arsenal de diagnóstico atual. Porém, em alguns pacientes com diarreia crônica, a colonoscopia pode evidenciar mucosa normal; nesses casos biópsias seriadas podem trazer informações importantes para o diagnóstico e tratamento dos pacientes. OBJETIVO: Analisar pacientes com diarreia crônica submetidos à colonoscopia macroscopicamente normal, avaliando assim histologicamente as alterações. MÉTODOS: Análise prospectiva da histologia 30 pacientes com diarreia crônica e colonoscopias normais, submetidos a biópsias seriadas de íleo terminal, cólon ascendente e reto. RESULTADOS: A amostra de 30 pacientes mostrou uma proporção de 18 homens (60%) e 12 mulheres (40%). Sobre os tipos de alterações histológicas, foi verificado que 13 pacientes (43,3%) apresentaram hiperplasia linfóide, inflamação eosinofílica em 4 (13,3%), inflamação inespecífica em 4 (13,3%), alterações regenerativas em 3 (10%), colite linfocítica em 2 (6,6%) e alterações compatíveis com Doença de Crohn em 1 (3,3%). CONCLUSÕES: Observou-se que mesmo pacientes com diarreia crônica, sem outros fatores associados, beneficiaram-se da colonoscopia com biópsia, pois a mesma realizou o diagnóstico etiológico em alguns casos como também o excluiu através da histopatologia. Verificou-se que a frequência de pacientes com biópsia alterada e quadros diarreicos menos arrastados (84,2%) foi grande, devendo-se considerar a realização do exame.

Radiotherapy in aggressive cutaneous pseudolymphoma: a case report and review of literature

Pseudolymphoma is a nonspecific disease characterized by lesions with lymphomatous-appearing but benign accumulation of inflammatory cells. They generally present as small ulcero-nodular lesions confined to skin which often respond to local therapies. We describe an unusual presentation of an extensive and locally aggressive cutaneous pseudolymphoma in a 21-year-old male patient who presented with extensive cutaneous eruptions gradually progressing over 6 years to involve the entire circumference of his left arm. Magnetic resonance imaging scans of his left arm showed a lesion deeply infiltrating into the soft tissue reaching up to the humerus with intense periosteal reaction. He was successfully treated with radiotherapy after many failed attempts with surgery and chemotherapy.

Lymphocytoma cutis: diagnostic enigma for the maxillofacial surgeon

Cutaneous lymphoid hyperplasia (CLH) is a cutaneous pseudolymphoma with a worldwide distribution, equally affecting all races and ethnic groups. Due to its vast array of characteristics, it is most often missed in the differential diagnosis of firm to soft lumps on the head and neck. A systematic approach to the workup and diagnosis along with treatment of such lesions is discussed in this article. A 20-year-old Asian Indian female presented to our Oral and Maxillofacial unit with a lump on the left side of her forehead for 1 month. Local examination revealed a 2.5×3.0 cm², well circumscribed swelling over the left para median region that was firm to doughy and non-tender. There was no other significant finding on general examination. Excisional biopsy of the lesion was performed, followed by histopathologic processing. The general etiology, pathogenesis, clinical presentation, differential diagnosis, clinical course, prognosis, treatment, and prevention have been discussed in line with the recent modalities of diagnosis and treatment of CLH. Due to the overlapping clinical and histological characteristics of CLH with many other lesions, it is important to consider this lesion in the differential diagnosis of cutaneous lesions.

Possibly drug-induced palpable migratory arciform erythema

Palpable migratory arciform erythema is an entity of unknown etiology, with few published cases in the literature. The clinical and histopathological features of this disease are difficult to be distinguished from those of Jessner’s lymphocytic infiltration of the skin, lupus erythematous tumidus and the deep erythema annulare centrifugum. We describe here the first two Brazilian cases of palpable migratory arciform erythema. The patients presented with infiltrated annular plaques and erythematous arcs without scales. These showed centrifugal growth before disappearing without scarring or residual lesions after a few days. They had a chronic course with repeated episodes for years. In addition, these cases provide evidence of a drug-induced etiology.

Detection and significance of BRAF gene in mature T/NK cell lymphoma / 中华肿瘤杂志

<p><b>OBJECTIVE</b>we aimed to investigate the mutation and expression of BRAF gene in mature T/NK cell lymphoma tissues and cell lines, explore the correlation between gene alterations and clinicopathological features and clinical outcomes of mature T/NK cell lymphoma.</p><p><b>METHODS</b>Firstly, we detected common mutant sites of BRAF (locus 1 799 mutation in exon 15 and loci 463, 465 and 468 mutation in exon 11) in lymphoma Jurkat, Hut-78 and YTS cell lines, normal peripheral blood lymphocytes, different types of mature T/NK cell lymphoma and reactive hyperplasia lymph nodes by direct sequencing. Then we measured the expression of BRAF in Jurkat, Hut-78, YTS cells and normal peripheral blood lymphocytes by real time-PCR and Western-blot detection. We also used immunohistochemistry (IHC) to detect the expression of BRAF in mature T/NK cell lymphoma tissues and reactive hyperplasia lymph nodes, and to analyze the correlation between the expression of BRAF and clinocopathological features and clinical outcomes.</p><p><b>RESULTS</b>We did not find common BRAF mutation in mature T/NK cell lymphoma tissues and cell lines, and the relatively expression of BRAF gene mRNA in normal peripheral blood lymphocytes, YTS, Hut-78 and Jurkat cells were 1.000, 5.207±0.013, 8.412±0.615 and 36.720±1.797, respectively, and protein expressions were 0.051±0.003, 0.102±0.013, 0.113±0.017 and 0.304±0.010, respectively, and the expression of BRAF in peripheral T cell lymphoma Jurkat cells was significantly higher than that of Hut-78, YTS cells and normal lymphocytes (P<0.05). Only 6 of 58 peripheral T cell lymphomas (10.3%) had positive BRAF expression, and were the subgroups of peripheral T cell lymphoma-unspecified type. The statistical data did not show any correlation between positive expression of BRAF and gender, age, clinical stage, location, lactate dehydrogenase in the 21 cases of peripheral T cell lymphoma-unspecified type (P<0.05), but the positive rate of BRAF in the effective treatment group (8.3%) was significantly lower than that of the invalid group (55.6%, P<0.05).</p><p><b>CONCLUSION</b>The expression of BRAF gene may become a marker of malignant biological characteristics and clinical therapeutic target of peripheral T cell lymphoma.</p>

Reactive Lymphoid Hyperplasia Treated with Radiofrequency Ablation / 대한내과학회지

Reactive lymphoid hyperplasia (RLH) is a rare benign liver mass that is characterized by proliferation of non-neoplastic lymphocytes extranodally. To date, only 43 cases have been reported in the English literature and 2 cases in the Korean literature. We report a case of hepatic RLH in a 36-year-old woman who had been diagnosed two years previously with an intrahepatic tumor that measured 0.6 x 1.0 cm on abdominal ultrasonography. Her medical history was otherwise unremarkable. On follow-up ultrasonography, the hepatic mass had increased in size. We biopsied the liver mass and the histopathologic findings confirmed reactive lymphoid hyperplasia. Radiofrequency ablation (RFA) was performed instead of surgical resection. The patient is currently doing well with no sign of relapse 1 year and 8 months after the RFA.

Benign nodules mimicking hepatocellular carcinoma on gadoxetic acid-enhanced liver MRI

No abstract available.

T-cell-predominant lymphoid hyperplasia in a tattoo

Cutaneous lymphoid hyperplasia (CLH) can be idiopathic or secondary to external stimuli, and is considered rare in tattoos. The infiltrate can be predominantly of B or T-cells, the latter being seldom reported in tattoos. We present a case of a predominantly T CLH, secondary to the black pigment of tattooing in a 35-year-old patient, with a dense infiltrate of small, medium and scarce large T-cells. Analysis of the rearrangement of T-cells receptor revealed a polyclonal proliferation. Since the infiltrate of CLH can simulate a T lymphoma, it is important to show that lesions from tattoos can have a predominance of T-cells.