A Comprehensive Study on Aberrant CD20-Positive Mycosis Fungoides: Clinical and Prognostic Insights.

BACKGROUND: As the majority of T-cell lymphomas lack CD20 expression, cases of mycosis fungoides (MF) exhibiting aberrant CD20 expression are exceedingly uncommon. OBJECTIVES: We aim to comprehensively evaluate the clinical, histopathological, and prognostic features of 7 patients diagnosed with CD20-positive MF. METHODS: This retrospective study examines seven cases of MF with aberrant CD20 expression. The study provides details of demographics, clinical features, histopathology and treatment outcomes. Key time points include initial diagnosis of MF, detection of CD20 expression and follow-up, with a mean follow-up of 46 months. RESULTS: Aberrant CD20-positive MF was diagnosed at an average age of 58.6 years, approximately 5.6 years after first MF diagnosis. Following CD20 detection, patients presented with advanced disease stages, requiring treatments such as chemotherapy, brentuximab vedotin, and allogeneic hematopoietic stem cell transplantation. Four patients died from lymphoma, with an average survival time of 52 months. CONCLUSIONS: Aberrant CD20 expression in MF is rare but indicates a progressive course associated with poor prognosis. This often requires systemic chemotherapy and, in certain instances, allogeneic hematopoietic stem cell transplantation. This study provides important insights into the clinical attributes, disease progression, and treatment options for MF patients with aberrant CD20 expression. Further research is necessary to validate the effectiveness of emerging therapies and enhance our understanding of the underlying mechanisms and prognostic determinants specific to this unique MF subgroup.

Integrated diagnosis of nevi with severely atypical features and impact of second opinions.

BACKGROUND: A subset of melanocytic proliferations is difficult to classify by dermatopathology alone and their management is challenging. OBJECTIVE: To explore the value of correlation with dermatoscopy and to evaluate the utility of second opinions by additional pathologists. METHODS: For this single center retrospective study we collected 122 lesions that were diagnosed as atypical melanocytic proliferations, we reviewed dermatoscopy and asked two experienced pathologists to reassess the slides independently. RESULTS: For the binary decision of nevus versus melanoma the diagnostic consensus among external pathologists was only moderate (kappa 0.43; 95% CI 0.25-0.61). If ground truth were defined such that both pathologists had to agree on the diagnosis of melanoma, 13.1% of cases would have been diagnosed as melanoma. If one pathologist were sufficient to call it melanoma 29.5% of cases would have been diagnosed as melanoma. In either case, the presence of dermatoscopic white lines was associated with the diagnosis of melanoma. In lesions with peripheral dots and clods, melanoma was not jointly diagnosed by the two pathologists if the patient was younger than 45 years. CONCLUSIONS: A considerable number of atypical melanocytic proliferations may be diagnosed as melanoma if revised by other pathologists. The presence of white lines on dermatoscopy increases the likelihood of revision towards melanoma. Peripheral clods indicate growth but are not a melanoma clue if patients are younger than 45 years.

Combined tumour of aberrant cytokeratin expressing acral lentiginous melanoma and poroma: Diagnostic challenge.

Combined tumours are uncommon and therefore these tumours may pose a diagnostic challenge. In the current case report, it is aimed to present the clinicopathological features of a combined tumour including melanoma with aberrant cytokeratin expression and poroma.

Postauricular linear basal cell carcinomas related to medical mask cords: a possible association.

Linear basal cell carcinoma (BCC) is a distinct clinical morphological variant of BCC. Although it has been speculated that trauma and the Koebner phenomenon may be linked to linear BCC, the pathophysiology has not yet been shown. Herein, 5 cases of BCC were presented that developed in the postauricular region as a result of trauma caused by the cords of the medical face masks worn during the COVID-19 pandemic.

Long-Term Follow-Up Results of Topical Imiquimod Treatment in Basal Cell Carcinoma.

BACKGROUND: Imiquimod 5% topical cream is approved for treatment of superficial basal cell carcinoma (BCC). Data on the long-term efficacy and usage in other BCC subtypes are scarce. OBJECTIVE: Evaluation of long-term safety and efficacy of topical imiquimod treatment in various BCC subtypes and locations, with individualized treatment duration. MATERIALS AND METHODS: Histopathologically confirmed BCCs treated solely with topical imiquimod were identified retrospectively and included in this study. Clinical and histopathologic tumor clearances were the primary end point. After treatment was concluded, patients were examined every 3 to 6 months. RESULTS: In total, 24 BCC samples from 22 patients (F:M = 9:13; mean age: 73.5 years, SD: 10.767) were evaluated. The majority of the lesions were located in the head and neck area (83%). Mean treatment duration until complete clearance was 15.7 ± 6.9 weeks (6-28 weeks). Imiquimod was discontinued in 3 lesions, due to either clinically or histopathologically insufficient response. During follow-up, 2 lesions recurred, at 42 and 50 months after treatment. During a mean follow-up time of 72.7 (SD = 9) months, 79.1% of the lesions were cured without local recurrence. CONCLUSION: Although imiquimod is only approved for superficial BCC, treatment success was high among the study patients with various histological subtypes, with good long-term cosmetic results.

Does extracellular matrix of the varicose vein wall change according to clinical stage?

OBJECTIVE: The etiology and pathophysiology of chronic venous disease is not fully understood. This study aimed to determine the variation of the extracellular matrix proteins in varicose vein wall according to clinical stage. MATERIAL AND METHODS: Forty varicose and 10 control veins were sampled from the saphenofemoral junction. The Clinical Etiologic Anatomic Pathophysiologic (CEAP) classification was used in patients with varicose veins. Samples were stained with hematoxylin-eosin, Masson's trichrome, EVG (Elastica-van Gieson) stain and with laminin, fibronectin, tenascin antibodies. Stained samples were examined immuno-histochemically. Changes in extracellular matrix were determined semi-quantitatively using light microscopy. RESULTS: It was observed that in the early stages (C2-C3) of chronic venous disease, fibrosis is increased in the intima and media layers, with fragmentation in lamina elastica interna, and increased tenascin expression in the intima layer. In advanced stages (C4-C6), the accumulation of tenascin in the intima continued along with fibrosis in the media layer, the thickness of the media layer increased and fibronectin deposition was observed. CONCLUSION: This study showed that changes first occur in the intima during the early stages of the disease with addition of alterations in the media layer at later stages.

Sildenafil-induced pigmented purpuric dermatosis.

We present a patient who experienced pigmented purpura 10 days after initiating sildenafil. The eruption cleared several weeks after discontinuation of the medication. To the best of our knowledge, this is the first case of pigmented purpuric dermatosis reported due to sildenafil.

A case with an indolent course of subcutaneous panniculitis-like T-cell lymphoma demonstrating Epstein-Barr virus positivity and simulating dermatitis artefacta.

Subcutaneous panniculitis-like T-cell lymphoma (SPTCL) is a rare form of cytotoxic T-cell lymphoma. The disease has a poor prognosis in patients with the complication of hemophagocytic syndrome, especially in those with Epstein-Barr virus (EBV) positivity. A 20-year-old woman presented with multiple, itchy, purplish nodules and excoriations on both of her upper limbs. The histopathologic, immunohistochemical staining, and clonal T-cell receptor gene rearrangement examinations of skin lesions revealed the diagnosis of SPTCL. In situ hybridization performed for EBV was positive. There were no findings suggesting systemic involvement of SPTCL, or hemophagocytic syndrome. The lesions improved with systemic corticosteroid therapy and radiotherapy, with no recurrence. We present a patient with a protracted course of SPTCL in whom EBV positivity was demonstrated. This apparent conflict may be explained by geographic and ethnic variations in EBV infection. Further studies may shed light on the real relationship between EBV-RNA and the course of SPTCL.

Is it possible to prefabricate a vascularized peripheral nerve graft?

The ideal technique to repair a damaged peripheral nerve is primary repair. Unfortunately, most damaged peripheral nerves have gaps making primary repair impossible. Autologous nerve grafts that are used to repair damaged nerves can either be conventional nonvascularized nerve grafts or vascularized nerve grafts. Vascularized nerve grafts are proposed to be superior to conventional nerve grafts especially in recipient beds that are scarred, with poor vascular supply. One of the disadvantages of vascularized nerve grafts is the limited donor site. It is possible to eliminate this problem by prefabricating vascularized nerve grafts. In this study, to prefabricate a vascularized nerve, segments harvested from left sciatic nerves of 10 Wistar albino rats were implanted on right femoral vessels, and intact right sciatic nerves were used as controls to evaluate the function, electrophysiologic studies, and histopathologic examination, were performed on these grafts 4 weeks after implantation. Prefabricated sciatic nerve grafts showed vascularization, but they did not show compound action potential activity to electrical stimulation and demonstrated diffuse and severe vacuolar degeneration and myelin loss. We were unable to prefabricate a functional vascularized nerve graft by this method.

Histopathological and electrophysiological study of CO(2), Er:YAG, and CO (2) + Er:YAG laser effect on peripheral nerve.

BACKGROUND: The purpose of this study was to investigate the morphological, histopathological, and electrophysiological changes of peripheral nerve after CO(2) (carbon dioxide), Er:YAG (erbium:yttrium aluminum garnet), and CO(2) + Er:YAG laser irradiation. There have been no comparative reports on CO(2), Er:YAG, and CO(2) + Er:YAG laser effects on peripheral nerve. METHODS: Thirty Wistar albino rats were randomly assigned to three groups. Group I received CO(2), group II Er:YAG, and group III CO(2) + Er:YAG laser irradiation. Contralateral untreated sciatic nerves from the same animals were used as controls. The effect of laser on the peripheral nerve was assessed morphologically, histopathologically, and electrophysiologically after 6 weeks of laser irradiation. RESULTS: No significant difference was observed between the treated and the untreated nerves. CONCLUSION: The overall findings indicated that CO(2), Er:YAG, and CO(2) + Er:YAG lasers may be used safely in nerve tissue surgery.

Subungual Glomangiomyoma.

Glomus tumors are relatively rare benign tumors originated from normal glomus bodies. These tumors make up approximately 2% of all hand tumors and are most commonly found in the nail matrix and proximal nail bed of the hands. Histopathologically, they are classified into solid glomus tumor, glomangioma, and the least common type glomangiomyoma. Here we report an unusual case of subungual glomangiomyoma of the toe with dermatoscopic and histopathologic findings.

Eye-conserving treatment in massive congenital orbital teratoma.

An 8-month-old healthy girl presented with a left orbital mass, which orbital magnetic resonance imaging revealed to be a well-circumscribed, mostly cystic lesion. The patient underwent orbitotomy via inferior fornicial conjunctival approach. Tumour shrinkage was accomplished by aspiration of the intralesional fluid, and the remaining debulked mass was removed by total excisional biopsy. Pathological examination revealed a cystic tumour lined mainly with keratinized stratified squamous epithelium, in addition to small foci of mucinous ciliated epithelium resembling respiratory epithelium. Histopathological findings were consistent with the diagnosis of mature orbital teratoma (hair follicles, adipose tissue, mature glial elements, choroid plexus-like papillary organizations and small foci of cartilage in the cyst wall). Derivatives of all three germ lines were present. At 56-month follow up, uncorrected visual acuity in the affected eye was 6/9. This case demonstrates the importance of decompressing the tumour before dissecting it from the periorbital tissues in an eye-conserving approach to orbital teratoma.

Dermatofibrosarcoma Protuberans of the Neck: A Brief Review of the Literature.

Dermatofibrosarcome protuberance (DFSP) is a rare, slow growing soft tissue sarcoma with fibroblastic origin, which has a great, potential of local invasion and recurrence. Because of its unspecific appearance and slow growth features it is commonly misdiagnosed as other benign lesions that leads to a late accurate diagnosis or an inadequate initial treatment. A young female patient with DFSP on the neck who was initially misdiagnosed as lipoma and then underwent inadequate initial resection is presented in this case.

Placenta, Secret Witness of Infant Morbidities: The Relationship Between Placental Histology and Outcome of the Premature Infant.

OBJECTIVE: The microscopic and macroscopic features of the placenta can contribute to the clinical understanding of premature delivery. The aim of our study was to figure out the relationship between the histopathological findings of the placentas of premature deliveries and its effects on neonatal morbidity and mortality. MATERIAL AND METHOD: The placentas of 284 singleton preterm infants with < 35 weeks of gestation were examined. Three groups were created as the normal, chorioamnionitis and vasculopathy groups according to the histopathological findings in the placentas of the subjects. RESULTS: The mean gestational age of the infants in the study group was 30.5 ± 3.2 weeks, and the mean birth weight was 1588 ± 581 g. The pathology was normal in ninety-six (33.8%), vasculopathy in 153 (53.9%) and chorioamnionitis in 35 (12.3%). The gestation age of the infants was lower in the chorioamnionitis group. Moreover, retinopathy of prematurity, early onset neonatal sepsis, and duration of respiratory support were found to be higher in the chorioamnionitis group. In the vasculopathy group, preeclampsia and small for gestational age were found to be significantly higher. CONCLUSION: Histopathological findings of the placentas from preterm deliveries provided important data in determining the etiology of preterm delivery and outcomes of infants. Infants delivered by mothers with chorioamnionitis were particularly found to be more preterm, and these preterm infants would have a longer hospital stay, higher respiratory support requirement, and more serious morbidities.

Congenital pilar leiomyoma.

Piloleiomyomas are benign smooth muscle tumors arising from the arrectores pilorum muscles in the skin. They usually occur as multiple firm dermal nodules located on the extremities and trunk. Solitary lesions are rare. Leiomyomas usually develop during adolescence or early adult life. Congenital pilar leiomiyoma is an extremely rare entity. We present a case of congenital solitary pilar leiomyoma located on the face.

Effect of platelet glycoprotein IIb/IIIa receptor antagonist on survival of epigastric island flaps in rats with total venous occlusions.

We evaluated the effect of tirofiban hydrochloride on the survival of epigastric island flaps in rats that had had all the veins occluded. Male Wistar Albino rats were randomly assigned to control (treated with sterile saline) and experimental (treated with tirofiban hydrochloride 1 mg/kg intravenously) groups. An epigastric island skin flap 3x6 cm was raised in each rat. All veins that drained the flap were ligated to give total venous occlusion. Blood flow was recorded by laser Doppler preoperatively (baseline), immediately after the flap had been sutured back to its original position (acute) and on postoperative days 1 and 3. The degree of necrosis was evaluated on day 3. Mean percentage necrosis and minimum laser Doppler values were compared in the two groups. Total necrosis was evident on day 1 in the control group and on day 3 in the experimental group. Macroscopic evidence was confirmed by histopathological examination. There were appreciable differences in blood flow and in the necrotic area of the flap in the experimental group compared with the control group on both days 1 and 3. Tirofiban hydrochloride might be effective in this flap model.

Esophageal carcinoma metastasis to cerebellum: a case report.

Esophageal carcinoma metastatic to the cerebellum and causing cerebellar compression is a rare entity. The authors report on the case of a 54-year-old woman in whom a metastatic cerebellar tumor secondary to esophageal carcinoma was treated. The patient presented with progressively increasing occipital headache. Computerized tomography scanning and magnetic resonance imaging results revealed a mass lesion in the cerebellum. Because of her previous esophageal carcinoma history, metastatic tumor to the cerebellum was assumed, and the patient underwent total resection of the tumor via median suboccipital approach. Histological examination of the specimen showed a metastatic adenocarcinoma of the esophagus. Postoperatively, the patient received 41 Gy radiation as adjuvant therapy. This case represents an addition to the reported literature of such a rare lesion. The diagnosis, treatment, and pathological findings of this case are presented and the pertinent literature is reviewed.

Sellar Embryonal Tumor: A Case Report and Review of the Literature.

Primitive neuroectodermal tumors (PNETs) are aggressive, poorly differentiated tumors in children and young adults. However, the embryonal tumor group did not include the central nervous system (CNS) PNET title and ependymoblastoma subtitle in the 2016 World Health Organization CNS tumor classification. Here, we report the case of a 6-year-old boy with a sellar embryonal tumor and present a review of the related literature. To the best of our knowledge, this is the first case of an endoscopically operated sellar embryonal tumor in the pediatric age group.