The ovaries are normally situated on the lateral aspect of the uterus in a shallow depression called an ovarian fossa. Maldescended ovaries occur when the ovary has not been localized in an intrapelvic location. Maldescended ovaries can be found with a normal uterus and more often with Mullerian duct abnormalities. There is no established association between ovarian tumors and maldescended ovaries. The present case report is a very rare case of mature cystic teratoma of a maldescended right ovary located within the subhepatic region. To bring this into focus in cases with an abnormal dermoid cyst site in a female. The patient should be carefully evaluated for ovarian sites and the possibility of maldescended ovaries should be taken into account. The maldescended ovaries with complicated cysts or with tumor should be included in the differential diagnosis of causes of abdominal pain in females.

Sarcoidosis is a granulomatous disease of unknown etiology that can involve various organs and tissues. The clinical manifestations vary greatly, so it is difficult to make a clear diagnosis of sarcoidosis with just the clinical manifestation and imaging findings. The diagnosis and treatment of a patient with systemic sarcoidosis was reported: a 51-year-old woman presented with a dry cough. Computed tomography (CT), magnetic resonance imaging (MRI), and conventional ultrasonography (US) suggested miliary nodules and inflammatory changes in the lungs, there was mediastinal, retroperitoneal and hilar lymph node enlargement and uneven liver echo, respectively. Positron emission tomography/computed tomography (PET-CT) further suggested that the lesions were distributed throughout the body, including the lymph nodes and muscles of the extremities; thus, systemic lymphoma was considered. Finally, ultrasound-guided biopsy of different sites yielded the same histopathological findings: sarcoidosis. The sarcoidosis in this case is characterized by a large number of involved sites with a wide range, and a variety of imaging data were complete but failed to suggest a diagnosis. Finally, a clear histopathological result was obtained under the guidance of ultrasound. This article reviewed the relevant literature and concluded that ultrasound-guided puncture to obtain histopathological results is a simple and effective method for the diagnosis of sarcoidosis.

Lymphoepithelioma-like cholangiocarcinoma (LELCC) is a rare subtype of carcinoma that is poorly reported. We report a case of LELCC in a 28-year-old female with chronic hepatitis B. She underwent secondary microwave ablation for residual tumor following the failure of radiofrequency ablation (RFA). Image fusion technology was used to accurately diagnose that the second lesion represented residual tumor. This case is the second successful application of microwave ablation in the treatment of LELCC. We first reviewed the ultrasonographic features of LELCC. We report this case to improve our understanding of this disease and provide evidence for its clinical treatment.

Granulosa cell tumor of the testis is a rare intermediate stromal cell tumor that can be distinguished in adult and juvenile type. The juvenile type is commonly presented in infants less than a year old-most often during the first 6 months of life and can be associated with ambiguous genitalia and chromosomal anomalies. We report two cases of juvenile granulosa cell tumor (JGCT) of the testis diagnosed in the neonatal period and review the typical sonographic findings of this entity.

Primary squamous cell carcinoma of the thyroid (PSCCT) is a rare clinical disease characterized by rapid growth, high invasiveness, and a poor prognosis. A 66-year-old male patient was admitted due to throat pain and dysphagia. Ultrasound revealed a calcified hypoechoic mass in the right lobe of the thyroid gland, measuring approximately 35.3 ml. Ultrasound and PET-CT both indicated high suspicion of malignancy. The patient underwent contrast-enhanced US-guided biopsy, and the pathological results revealed poorly differentiated squamous cell carcinoma. CEUS was performed regularly during the Chemotherapy combined with pembrolizumab (PD-1) treatment courses. The vital area was significantly reduced with neither recurrence nor cervical lymph node metastasis. Surgical resection and chemotherapy combined with immunotherapy had a significant treatment effect in this case. CEUS is helpful for diagnosis confirmation, biopsy guidance and efficacy evaluation and has important clinical application value.

This paper reports a case of closed reduction internal fixation of pelvic fracture and minimally invasive hemostasis procedure and hematoma catheterization and drainage for the active pelvic bleeding site and giant hematoma, guided by a robot-assisted teleultrasound. In this case, the robot-assisted teleultrasound-guided minimally invasive interventional hemostasis and catheterization utilized a partial master-slave approach. It was preliminarily confirmed that robot-assisted teleultrasound-guided minimally invasive hemostasis and puncture catheterization for hematoma were accurate and effective. The robot-assisted teleultrasound overcomes the reliance on physician experience in ultrasound-guided interventional diagnostics and treatment, and promoting the use of minimally invasive "visualized" technology across any distance.

Appendiceal mucinous neoplasms are relatively rare. Following rupture of a mucinous neoplasms of the appendix, mucus can implant into the scrotum along the congenital or acquired inguinal space. We report a case of a testicular mucinous neoplasm with no preoperative abdominal lesions. Scrotal ultrasound showed an irregular mass in the right testis and inguinal area, with uneven echogenicity (stripe hyperechoic layered distribution) and no obvious blood flow signals. Ultrasound diagnosis was suspected as mucinous neoplasm. Postoperative pathology was confirmed to be low-grade mucinous neoplasm of the testis. Subsequently, the surgeon performed laparoscopic exploration and found that the appendix tumor had ruptured and the peritoneal cavity was implanted, and an appendectomy was performed. Postoperative pathology confirmed a low-grade appendix mucinous neoplasm. The evaluation and discovery of a scrotal mucinous neoplasm requires exploration of the appendix with ultrasound imaging. Even if the inner diameter of the appendix is normal but the presence of ascites, appendiceal mucinous neoplasms need to be considered.

Arteriovenous malformation (AVM) is a kind of congenital endothelial malformation that results from errors in vascular morphogenesis. Here we present a case of maxillofacial AVM in a 19-year-old male for its imaging characteristics on contrast-enhanced ultrasound (CEUS). On conventional ultrasound, the lesion was a large subcutaneous mass with abnormal vasculature. On CEUS, it manifested as a “quick wash-in and slow wash-out” enhancement. Moreover, CEUS showed a much larger range of the lesion than gray-scale imaging, with left ophthalmic artery involved. CEUS enabled real-time observation of the microcirculatory perfusion of the lesion and played a very important role in the detection and evaluation of maxillofacial AVM.

Schistosoma japonicum causes intestinal schistosomiasis, which affects mainly the rectum and sigmoid colon but rarely the urinary tract. Here we report a rare case of S. japonicum infection of the bladder and ureter, and describe its clinical features and imaging findings. We also put this case in perspective with the literature on S. japonicum infections in humans.

Undescended testis or cryptorchidism is the most common reproductive system disease in children. About 3% of full-term and 30% of premature male infants are born with one or both testicles undescended. Most cryptorchidism is asymptomatic and is occasionally found due to inguinal pain caused by testicular torsion. Herein, we presented a case of pediatric patient with abdominal pain as initial symptom who was found the left inguinal cryptorchidism complicated by testicular torsion, and then spontaneous remission during the color Doppler ultrasonography examination.

The gastrointestinal tract, particularly the colon, represents a rare site of metastatic carcinoma. It is difficult to diagnose because of its nonspecific clinical and imaging features. Herein, we reported the case of a 64-year-old Asian male who presented with a solitary mass on his right colon. We successively performed contrast-enhanced ultrasonography, computed tomography (CT) and colonoscopy. Colonoscopy-guided biopsy revealed inflammatory granulomatous and necrotic tissue. The mass was resected and identified as a metastatic carcinoma of renal cell carcinoma (RCC). The details of the case and review of related articles are presented.

Castleman disease (CD), first described in 1954, is a rare lymphoproliferative disorder. A 20-year-old female patient was treated for a "painless mass below the right ear for 1 year". The imagological examination of the patient showed a soft tissue mass about 2.8 cm in diameter in the right parotid gland. Moreover, the patient underwent a right superficial parotidectomy and facial nerve dissection. The mass in the parotid gland was removed, and CD was confirmed by further pathological examination. Imagological examination contributes to the diagnosis and preoperative evaluation of CD.