Many faces of malignant melanoma: Histopathological evaluation of liver biopsies

Background: Malignant melanoma (MM) is an aggressive tumor characterized by high metastatical potential and is sometimes diagnosed by distant organ metastasis such as liver. Morphologically it may mimic many other tumors and cause diagnostic challenges. In this paper, eleven MM cases metastasized to the liver with different morphologic patterns were analyzed in the light of literature. Materials and Methods: Histopathological and immunohistochemical findings of the cases diagnosed as MM metastasis in liver were reevaluated in the light of clinical data. Results: We obtained 11 MM cases with hepatic metastasis. In slides of the first four cases, morphologic features similar to epithelioid variant of MM with different amounts of melanin deposition were observed. In the fifth and sixth cases, fascicular patterned tumoral lesion composed of spindled cells were detected; and in the seventh and eighth cases, nested and sheet-like patterned tumoral lesion consist of giant bizarre and spindled cells with hyperchromatic nuclei were observed. The last three cases consisted of plasmacytoid cells with eccentric nuclei in pseudoalveolar pattern; and the exact diagnosis was possible with the help of immunohistochemistry. Conclusion: MM should always be kept in mind in differential diagnosis of metastatic hepatic tumors with unknown primary because of its various morphological characteristics.

Three-dimensional morphology and asymmetry of the intraparietal sulcus in Chinese brain / 解剖学报

Objective The pattern and morphological features of the intraparietal sulcus(IPS) were explored on MRI in vivo using 3D visualization method,so as to provide anatomical basis for the brain function studies of the parietal lobe as well as the diagnosis and treatment of the related diseases. Methods Totally 107 right-handed Chinese subjects were selected and scanned to acquire high quality MR images of the brains using 3. 0T high-resolution magnetic resonance imaging scanner. The 3D anatomical model of the IPS was reconstructed by BrainVISA, then the morphological patterns of the IPS were observed and analyzed. Results There were three types of the IPS: Continuous type, two segments type and three segments type. The gyri which separate different segments were either visible on the brain surface or buried within the sulcus. In the left brain, the continuous type was in dominant(56. 07%). while the two segments type was the most common type in the right brain(58. 49%) ,and the morphology of the IPS had significant asymmetries in both sides(lJ0. 05). Conclusion The morphology of the IPS is very complicated and it has three main types. There are obvious bilateral differences within the IPS.

Diagnostic methods for identification of root-knot nematodes species from Brazil / Métodos diagnósticos usados na identificação de espécies do nematoide das galhas do Brasil

ABSTRACT: The accurate identification of root-knot nematode (RKN) species (Meloidogyne spp.) is essential for implementing management strategies. Methods based on the morphology of adults, isozymes phenotypes and DNA analysis can be used for the diagnosis of RKN. Traditionally, RKN species are identified by the analysis of the perineal patterns and esterase phenotypes. For both procedures, mature females are required. Over the last few decades, accurate and rapid molecular techniques have been validated for RKN diagnosis, including eggs, juveniles and adults as DNA sources. Here, we emphasized the methods used for diagnosis of RKN, including emerging molecular techniques, focusing on the major species reported in Brazil.

RESUMO: A identificação acurada de espécies do nematoide das galhas (NG) (Meloidogyne spp.) é essencial para a implementação de estratégias de manejo. Métodos baseados na morfologia de adultos, fenótipos de isoenzimas e análise de DNA podem ser usados para a diagnose do NG. Tradicionalmente, as espécies de NG são identificadas pela análise do padrão perineal e fenótipos de esterase. Em ambos os procedimentos, fêmeas maduras são necessárias. Nas últimas décadas, técnicas moleculares acuradas e rápidas têm sido validadas para a diagnose de NG, incluindo ovos, juvenis e adultos como fontes de DNA. Aqui, nós destacamos os métodos usados para a diagnose de NG, incluindo técnicas moleculares emergentes, focando nas principais espécies encontradas no Brasil.

Comparison of Intracranial Ictal EEG Patterns between Medial and Lateral Temporal Lobe Epilepsy / 대한간질학회지

BACKGROUND AND OBJECTIVES: Temporal lobe epilepsy is the most common uncontrolled epileptic condition and is increasingly treated with surgery. In the absence of definitive results from noninvasive procedures, patients undergo implantation of intracranial electrodes. Intracranial EEG recordings are more accurate than scalp EEG recordings because of minimal artifact and closer approximation to the area of seizure onset. Intracranial EEG patterns between the medial and the lateral temporal lobe epilepsy were thought to have a little differences. METHODS: The authors compared the morphological pattern of seizure onset area, spread pattern, termination pattern and duration of the intracranial EEG manifestation of spontaneous seizures recorded from combined depth and subdural electrodes in 25 intractable temporal lobe epilepsy patients. RESULTS: Sixteen cases were medial temporal onset, six cases were neocortical onset and three cases were multifocal onset. The morphological onset pattern of medial temporal seizures was more likely to have high frequency rhythmic discharge (>13 Hz) and tended to show repetitive spikes prior to the seizure, whereas neocortical seizures were characterized by slow (4-to 10-Hz) and fast frequencies (>35 Hz), without evidence of repetitive spikes. The mean ictal duration at seizure onset of complex partial seizure of medial onset seizure was 121 seconds and was not different from those of neocortical seizures which were 115 seconds. Neocortical seizures take more time to propagate than medial seizures. Propagation to the opposite side of neocortical onset seizure takes 45.53 seconds, whereas medial temporal onset seizure takes 27.92 seconds. In case of second generalization, neocortical seizures continued longer than medial seizures. Of the medial onset temporal lobe seizures, except the simple partial seizures, the 35.2% of seizures initially spread to ipsilateral neocortex, and the 28.2% of seizures initially spread to the contralateral medial temporal lobe and the 25% of seizures simultaneously propagated to the ipsilateral neocortex and contralateral medial temporal lobe. Among the seizures initiated from the neocortex, 79.3% of seizures initially spread to the ipsilateral medial temporal area, but never initially spread to opposite neocortex. The termination pattern of seizures was divided into three types according to their location. In case of medial temporal lobe seizures, the mean of 31% of seizures was diffusely terminated , 38% of seizures terminated at the onset region and 38% of seizures were elsewhere within onset region. On the other hand, 48.6% of neocortical temporal lobe seizure were terminated at seizure onset region. CONCLUSIONS: The pattern of ictal intracranial EEG provides distinguishable differences between the medial temporal seizure and the neocortical temporal seizure.