Sinonasal Myxoma in an Infant: Observations on Its Distinctiveness and a Discussion on Potential Reclassification As Infantile Intraosseous Myxoid Desmoid Fibromatosis.

Myxomas, when they manifest in the paranasal sinuses and/or maxillae of infants, are classified as sinonasal myxomas (SNMs). We present a case of SNM in the maxilla of a 15-month-old infant. Following the initial surgical intervention, the patient unfortunately experienced a recurrence of the condition. However, a subsequent surgery employing marginal excision was performed, and since then, no further recurrence has been reported. SNM exhibits consistent clinical features and histological characteristics that are distinct from those of odontogenic myxomas. Furthermore, in this case, immunohistochemical staining was positive for ß-catenin, whereas odontogenic myxomas are generally negative for ß-catenin staining. Another study reported that SNMs share genetic mutations with desmoid tumors, which are not observed in odontogenic myxomas. This suggests that this entity is distinct from odontogenic myxomas, leading us to propose that it may indeed represent a separate disease entity. This fact may lead to the reclassification of the disease and, ultimately, to changes in treatment strategies.

A Clinical Study of Histopathological and Clinical Image Changes After Sclerotherapy of Lip Venous Malformations.

Venous malformations (VMs) are histopathologically benign but can greatly impair patients' quality of life. Screlothprapy is known to be effective in improving symptoms without a scar, but surgical resection of residual lesions is sometimes necessary due to inadequate reduction. However, there is no consensus on what criteria should be used to consider switching to surgical treatment, and individualized decisions must be made for each case. To investigate the factors that contribute to the lack of efficacy of sclerotherapy in reducing lesions and how to predict this, the authors performed a retrospective clinical imaging and histopathological study of 6 cases of labial vein malformations treated with sclerotherapy and 3 cases without sclerotherapy. Clinical image investigations are based on magnetic resonance imaging before and after sclerotherapy. The authors found a significant decrease in the percentage of cystic components in the total lesion of VMs after sclerotherapy. Histopathological investigations are based on resected VMs with or without sclerotherapy. Elastica van Gieson stains suggested a significant increase in fibrotic tissue inside VMs treated with sclerotherapy compared with those without. In conclusion, magnetic resonance imaging signal changes inside the VMs after sclerotherapy was observed, and it may reflect fibrosis of the tissue. These changes in the VMs after sclerotherapy may reduce the effect of sclerotherapy on tissue reduction should be considered.

Pineal gland differentiation in mature teratoma: An under-recognized condition and potential pitfalls for overdiagnosis.

We herein report three cases of mature teratomas with pineal gland differentiation, which is a less recognized phenomenon. Case 1 was a 6-year-old male with a neck mass, Case 2 was a 23-year-old female with a retroperitoneal mass, and Case 3 was a 45-year-old female with a retroperitoneal mass. Each case showed the typical macroscopic and histological findings of mature teratoma, such as solid and cystic lesions mainly lined with a mature squamous epithelium. All cases also showed glial differentiation. Small foci of lobulated cell nests were detected in the center of or adjacent to mature glial tissue. Cells had a clear to pale eosinophilic cytoplasm with small round nuclei. Immunohistochemically, cells were positive for synaptophysin, neurofilament protein with a perivascular "club-shaped swelling" pattern, and cone-rod homeobox protein. To the best of our knowledge, this is the first report of pineal gland differentiation arising in mature teratoma, which may be easily overlooked or misdiagnosed as somatic-type tumors, particularly neuroendocrine tumors. To avoid overtreatment, pathologists need to be aware that pineal gland differentiation may occur in mature teratomas.

Experimental study on the efficacy of a hybrid artificial nerve: The hot dog method.

INTRODUCTION: We hypothesized that hybrid artificial nerves might overcome the limitations of a nerve conduit by isolating nerve fascicles from autologous nerves. Nerve sacrifice during harvest, a drawback of conventional autologous nerve transplantation, may be reduced by the hot dog method. The hot dog method (based on the morphology of hybrid artificial nerves) adds nerve conduits to autologous nerve fascicles. METHODS: Forty-eight rats with a 10-mm sciatic nerve defect were divided into six groups (n = 8 per group) according to the neural reconstruction method: autologous nerve transplantation, the hot dog method, nerve conduit, nerve fascicle transplantation, sham control, and nerve fascicle isolation were classified as Groups I, II, III, IV, V, and VI, respectively. The sciatic nerve function was assessed in these groups, a histological evaluation was performed, and statistical analyses were conducted based on these data. RESULTS: Group III (nerve conduit) and Group IV (nerve fascicle transplantation) showed the lowest functional and axonal regenerative effects, followed by Group II (hot dog method) and Group I (autologous nerve transplantation). Group VI (nerve fascicle isolation) tended to achieve better recovery in motor function and axonal regeneration than Group I (autologous nerve transplantation). CONCLUSIONS: The hot dog method is simple, safe, and easy to execute. This method can serve as a new neural reconstruction method that uses artificial nerves.

Mature teratoma treated as lymphatic malformation for 5 years: a case report and literature review.

Teratomas and lymphatic malformations are included in the differential diagnosis of congenital neck masses. They can exhibit similar clinical findings. The authors present a case of mature teratoma that had been managed as a lymphatic malformation for years. Clinicians should be careful not to dismiss clues for the correct diagnosis.

Unusual complications from amitriptyline intoxication.

Althoughtricyclic antidepressants(TCAs) are frequently prescribed to patients with depression, these drugs can also be misused. A 21-year-old comatose patient was referred to our hospital presenting with ventricular tachycardia. Despite initial treatment including intravascular lipid emulsion, ventricular fibrillation occurred soon after arrival. Venoarterial extracorporeal membrane oxygenation and therapeutic hypothermia were administered. Refractory arrhythmia disappeared on the next day. A high concentration of amitriptyline was identified in his blood samples on arrival. Mechanical bowel obstruction followed after abdominal compartment syndrome caused by anticholinergic effects, and refractory seizure occurred due to TCA intoxication. Although seizure was brought under control with anticonvulsant agents, his Glasgow Coma Scale did not recover to the full score. MRI presented irreversible damage to the bilateral frontal lobe and insula. Amitriptyline has the potential to cause unusual serious complications, such as abdominal compartment syndrome, irreversible central nervous system disability and lethal arrhythmia.