Approximately 20 pelvic lymph nodes may serve as a guideline for a sufficient standard pelvic lymph node dissection. Lymphadenopathy in prostate cancer patients is not always a result of metastases but, rather, hyperplastic or regressive alterations. A preferential distribution of lymph node metastases along the left iliac vessels regardless of the primary tumor site in the prostate warrants further investigation.

There are many different classifications of vascular anomalies. As the correct classification of the vascular lesion has a direct influence on therapy it is difficult to decide which treatment should be considered as the treatment of choice. Based on an extensive review of the literature and personal experience of the treatment of more than 200 patients with hemangiomas or vascular malformations of the head and neck, a clinical classification is described that allows vascular lesions to be categorized in order to plan purposeful treatment. In general, hemangiomas represent the main group of vascular lesions in infancy and childhood. They are usually apparent a few weeks after birth and are characterized by an initially rapid growth of epithelial cells, followed by spontaneous involution. Hemangiomas should be differentiated from vascular malformations that are present at birth but may not be evident clinically. Spontaneous involution of vascular malformations has never been reported, whereas laser therapy can induce involution of hemangiomas at an early stage in a majority of cases. In certain situations steroids or surgical removal may seem to be the appropriate therapy of choice. In contrast, vascular malformations have to be treated according to their histopathology and location, as well as their hemodynamic features as shown radiographically with angiography. The accurate diagnosis of vascular anomalies is essential for further treatment, as shown by clinical experience at the University of Marburg.

Sentinel lymphadenectomy correctly identified the stage of metastatic disease in 97% of patients in cases in which up to three sentinel nodes were identified. If only the lymph node with the highest tracer activity had been excised, 39% of cancer-positive necks would have been missed. Selective ND identified metastatic disease in the additional 3% of patients.

We show that an aggressive surgical approach leads to long-term survival in patients with malignant PETs. Although long-term cure can only be achieved in a proportion of patients with malignant PETs, significant long-term palliation can be achieved.

Objective The purpose of this case series is to evaluate the diagnostic potential of contrast‐enhanced ultrasound (CEUS) in patients with clinically suspected pulmonary embolism (PE), suspicious pleural lesions, and negative computed tomography pulmonary angiogram (CTPA). Patients/Methods Between January 2017 and January 2018, we examined patients with an intermediate or a high‐risk Wells score and a negative CTPA with lung B‐mode ultrasound (LUS). In a total of six patients, pleural defects were identified and further examined by CEUS. Nonenhancing lesions or those with inhomogeneous enhancement were considered to be suspicious for an embolic event and biopsied for histological validation. The data analysis was retrospective. Results In LUS, the lesions had an average size of 2.4 cm (range 2‐3 cm). Five were hypoechoic and one was complex. The shape was wedge shaped (n = 5) or round (n = 1), and the number was solitary (n = 4) or multiple (n = 2) with dorsobasal localization (n = 6). Three lesions were nonenhancing, and three had an inhomogeneous enhancement with areas with complete absence of enhancement. The histological examination showed pulmonary infarction in all six cases, and in one patient also cells of a lung carcinoma. Conclusion Our case series demonstrates the diagnostic potential of CEUS for detecting peripheral pulmonary infarction in patients with clinically suspected PE and negative CTPA scan regarding PE. A histological validation or a narrow follow‐up might be warranted in some cases.

In this study the numerical growth and topological distribution of Clara cells were investigated in normal and hypoplastic lungs of fetuses ranging in age from the 10th to the 24th gestational week. In addition, the lungs of premature infants suffering from hyaline membrane syndrome (HMS) and bronchopulmonary dysplasia (BPD) were used as a model of disturbed lung growth in the early postnatal phase. Clara cells were observed to appear in the airway epithelium of fetuses of the 15th gestational week. After the 15th week of gestation the Clara cell number increased monotonously with increasing gestational age, reaching 5.4% Clara cells in the bronchial epithelium and 11.2% in the bronchiolar epithelium at the 24th gestational week. In the investigated period of gestation the Clara cell number was significantly higher in the bronchiolar epithelium compared to the bronchial epithelium. Hypoplastic lungs showed no difference in number and distribution of Clara cells compared to normal age-matched controls. This finding suggests the growth of Clara cells to be relatively accelerated compared to the decreased maturation of the lung parenchyma. The HMS/BPD cases showed normal Clara cell counts in the bronchial epithelium, whereas in the bronchiolar epithelium this value was decreased. This finding is caused by the extreme turnover of the airway epithelium in HMS/BPD; the local distribution of the epithelial damage is speculated to be caused by the physicochemical properties of inhaled oxygen.

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