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Rhabdomyoma of the orbit is a rare tumor with very few cases reported in the literature. We herein describe a 5-year-old boy who presented to us with a deviation of his left eye. Magnetic Resonance Imaging (MRI) showed a well-defined homogeneous intraconal mass in the superomedial aspect compressing the optic nerve. An excision biopsy was performed and the diagnosis of rhabdomyoma was confirmed on histopathology and immunohistochemistry with a coincidental finding of Trichinella spiralis larvae within the excised specimen. We report this phenomenon in two rare diseases with a predilection for striated muscle occurring simultaneously in a single patient.

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A newborn Thoroughbred filly presented with a large mass located on the ventro-rostral aspect of the mandible. The mass was surgically removed under general anaesthesia. Upon gross examination, the mass was well circumscribed with a heterogeneous lobulated appearance. The results of histopathology and immunohistochemistry were consistent with a diagnosis of congenital fetal rhabdomyoma. On follow-up at six months post-surgical excision, no abnormalities were noted on clinical examination.

Sudden death in infants remains a common and poorly understood cause of childhood mortality in the USA. Pediatric cardiac tumors, although rare, may underlie some cases of unexplained sudden infant death. Autopsy is a crucial diagnostic step in these cases, as both gross and microscopic examination of the heart may uncover occult cardiac tumors. Rhabdomyomas are the most common cardiac tumors in childhood and may result in arrythmia and sudden death. We present a case of sudden death in a healthy 5-month-old infant which initially appeared \"SIDS-like\" until thorough histological analysis revealed an underlying cardiac rhabdomyoma. The case is of particular importance in that the gross examination of the heart was considered completely normal, and the tumor only involved certain portions of the heart microscopically. Had a single random section of myocardium been the only heart section examined microscopically, the diagnosis might have been missed. This case emphasizes the importance of thorough microscopic examination in infant cases, especially in cases where the heart appears grossly normal.

本文报道1例罕见的喉旁间隙成年型横纹肌瘤（adult rhabdomyoma）。患者女，46岁。镜下观察示瘤细胞排列紧密，体积大，胞质丰富且呈嗜伊红，细胞核小，可见特征性的“蜘蛛状”细胞。免疫组织化学示结蛋白弥漫强阳性，平滑肌肌动蛋白和肌特异性肌动蛋白部分阳性，Myogenin和肌球蛋白小灶阳性，而广谱细胞角蛋白、S-100蛋白、HMB45、TFE3和突触素阴性，这些特征有助于与其他肿瘤鉴别。成年型横纹肌瘤罕见，预后良好，其病理特征对确诊至关重要。.

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We report the case of a female neonate admitted to the neonatal ICU with a rapid, narrow-complex tachyarrhythmia determined to be supraventricular tachycardia. Multimodality imaging and genetic testing confirmed a diagnosis of tuberous sclerosis complex with multiple cardiac rhabdomyomas. At 13 days of age, the patient was readmitted, exhibiting recurrent supraventricular tachycardia non-responsive to first-line treatment. Management required triple-drug therapy, whereafter the patient remained stable without recurrences. This is a rare report of supraventricular tachycardia in a functionally normal heart with the occurrence of supraventricular tachycardia due to structural abnormalities, with the possibility of multiple concealed accessory pathways.

Tuberous sclerosis is an uncommon neurocutaneous syndrome characterized by hamartomatous growths with unpredictable progression. Diagnosing and managing neonatal tuberous sclerosis can be challenging. We report a rare case of a 30-day-old male born out of a non-consanguineous marriage who presented with poor suckling and persistent abnormal body movement, required prolonged intensive care, and was diagnosed with tuberous sclerosis with multisystem involvement.