Variations in Foramen Transversarium in Typical Cervical Vertebra / Variaciones del Foramen transverso en una Vértebra Cervical Típica

SUMMARY: In literature were described variations in foramen transversarium in cervical vertebrae, as well as their clinical importance, and the information about them boils down to the individual case reports or population morphological studies. The aim of this paper is to contribute to the knowledge of morphological characteristics of the transverse openings on vertebrae of the cervical region. The study was performed on 60 typical vertebrae that are part of the collection of the Department of Anatomy in Nis. The characteristics of permanent openings were measured and accessory foramina were recorded. It was found that the diameter of the openings on the left side was 5.595±0.92 x 5.390±1.507 mm, and on the right 5.766±1.201 x 6.101±1.401 mm. Unilateral completely separated accessory foramina were recorded in 10.17 % of cases, dominant on the left side, and incompletely separated cases in 5.09 %. The research has demonstrated a relatively high incidence of accessory foramina and deviations from circular shaped openings.

En la literatura se describen variaciones en el foramen transverso de las vértebras cervicales, así como su importancia clínica, y la información sobre ellas se reduce a informes de casos individuales o estudios morfológicos poblacionales. El objetivo de este trabajo fue contribuir al conocimiento de las características morfológicas de los forámenes transversos de las vértebras cervicales. El estudio se realizó en 60 vértebras típicas que forman parte de la colección del Departamento de Anatomía de Nis. Se midieron las características de los forámenes constantes y se registraron los forámenes accesorios. Se encontró que el diámetro de los forámenes del lado izquierdo era de 5,595±0,92 x 5,390±1,507 mm, y del derecho de 5,766±1,201 x 6,101±1,401 mm. Se registraron forámenes accesorios unilaterales completamente separados en el 10,17 % de los casos, dominantes en el lado izquierdo y casos incompletamente separados en el 5,09 %. La investigación ha demostrado una incidencia relativamente alta de forámenes accesorios y desviaciones de forma circular.

Morphometric analysis of the epineurial and endoneurial blood vessels of the human sciatic nerve in relation to aging.

The aim of this research is to perform an analysis of the epineurial and endoneurial blood vessels in relation to aging. The research is conducted on samples of the human sciatic nerve of 12 case (age from 27 to 89). The histological sections are stained by streptavidin-biotin method of detecting the presence of Type IV collagen. After morphometric analysis the following stereological parameters have been calculated: the number of blood vessels per unit of area, the volume density of the blood vessels and the surface density of the blood vessels of the epineurium and endoneurium. An additional diameter measurement is performed for the endoneural blood vessels. In order to perform a more detailed analysis, the cases were classified into three age groups, the first (27-48 years), the second (49-70 years) and, the third (over 70 years). The bivariate correlation analysis showed that the number of blood vessels of the endoneurium, their volume and surface densities in relation to age produced a statistically significant positive correlation. One Way ANOVA test demonstrated a statistically significant increase in the number of endoneurial blood vessels in the age group III when compared the age group I and, in addition, it showed a significant decrease in the diameter of the age group II when compared to the age group I. Paired t - test shows a statistically significant higher number of endoneurial blood vessels in relation to the epineurial, namely, in the age group III. The volume and surface density of the epineurial blood vessels is significantly higher than the endoneurial in both the I and II age group. Age brings about significant changes of the endoneurial vascular network of the sciatic nerve due to the increase in density of the endoneurial blood vessels, their volume and surface densities. Consequently, in the cases older than 70 years, the number of endoneurial blood vessels significantly exceeds the number of epineurial blood vessels.

Morphometric analysis of the stylohyoid complex.

PURPOSE: Stylohyoid complex is anatomical structure predisposed to numerous individual variations. These may result in its extreme elongation, medial deviation and finally Eagle's syndrome occurrence. The aim of this study was to measure the length, angulation, evaluate morphological variations of stylohyoid complex by computed tomography and, subsequently, relate obtained data to the gender and the age of the evaluated cases. MATERIALS AND METHODS: The material included CT scans of stylohyoid complexes of 282 individuals. The entire length, maximal thickness, and angulation of the stylohyoid complexes in the coronal, transverse, and sagittal planes were measured. RESULTS: According to their morphology, orientation and length, stylohyoid complexes were classified into six morphological types. Elongated, bent, segmented, and segmented with attached stylohyoid ligament for the lesser horns of the hyoid bone stylohyoid complex types were characterized by significantly greater length, while pseudoarticulated type was characterized by significantly lower length in relation to normal stylohyoid complex type. The elongated type was additionally significantly thicker and with significantly lower value of medial angle in transverse plain than the normal stylohyoid complex type. Elongated, bent, and segmented types were significantly more frequent in males than in females. Furthermore, the frequency of the elongated stylohyoid complex type increased, whereas normal and pseudoarticulated types decreased with age. CONCLUSIONS: In conclusion, elongated and more medially deviated stylohyoid complexes are more frequent in males than in females. Their more frequent presence in the older age groups indirectly connects this phenomenon with the aging process.

Morphometric analysis of the diameter and g-ratio of the myelinated nerve fibers of the human sciatic nerve during the aging process.

Myelinated nerve fibers suffer from different degrees of atrophy with age. The success of subsequent regeneration varies. The aim of this research was to analyze myelinated fibers of the human sciatic nerve during the aging process. Morphometric analysis was performed on 17 cases with an age range from 9 to 93 years. The outer and inner diameter of 100 randomly selected nerve fibers was measured in each of the cases evaluated, and the g-ratio (axonal diameter/outer diameter of the whole nerve fiber) of each was calculated. Scatter plots of the diameters and g-ratios of the analyzed fibers were then analyzed. Nerve fibers of each case were classified into three groups according to the g-ratio values: group I (g-ratio lower than 0.6), group II (g-ratio from 0.6 to 0.7) and group III (g-ratio higher than 0.7). Afterwards, nerve fibers of group II were further classified into small and large subgroups. The percentages of each group of nerve fibers were computed for each case and these values were used for correlational and bivariate linear regression analysis. The percentage of myelinated nerve fibers with large diameter and optimal g-ratio of the sciatic nerve declines significantly with age. This is accompanied by a simultaneous significant increase in the percentage of small myelinated fibers with g-ratio values close to 1 that occupy the upper left quadrant of the scatter plot. It can be concluded that aging of the sciatic nerve is associated with significant atrophy of large myelinated fibers. Additionally, a significant increase in regenerated nerve fibers with thinner myelin sheath is observed with age, which, together with the large myelinated fiber atrophy, might be the cause of the age-related decline in conduction velocity. A better understanding of the changes in aging peripheral nerves might improve interpretation of their pathological changes, as well as comprehension of their regeneration in individuals of different age.

The Infraorbital Artery in Fetuses: Clinical Relevance in Perforator Flap Surgery.

INTRODUCTION: The reconstruction of soft tissue detects in mid facial region are highly demanding. Most challenging region are nasal alla. For full thickness nasal alla defects most authors use nasolabial flap based on facial/angular arcade, but for recidivans tumors the infraorbital perforator flap is a good solution. AIM: The aim of our research was to analyze the number and the course of the infraorbital artery terminal branches. MATERIAL AND METHODS: Material was 60 fetal hemifacial specimens of different gestational ages. Fetuses were fixed in 10% formalin and arterial blood vessels were injected with Micropaque solution (barium sulfate). Samples were further processed by Spalteholz technique, their images captured with digital camera and analyzed. Infraorbital artery was constant artery and had 2 to 4 terminal branches supplying infraorbital region. The majority of its terminal branches were characterized with descending course. Reach anatomical network of infraorbital artery made anastomoses with facial artery. CONCLUSION: Perforator flap based on infraorbital artery had well defined vascular supply with numerous soft tissue branches, which qualify this flap as safe solution for nasal reconstruction.

Impact of Ki-67 and E-cadherin expression on lymphovascular invasion in upper urinary tract urothelial carcinoma.

BACGROUND/AIM: Upper urinary tract urothelial carcinoma (UUT-UC) constitutes 5% of malignant neoplasms arising from transitional epithelium, but is more invasive than bladder cancer. Lzmphovascular invasion (LVI) is associated with biologically aggressive carcinoma and with occult metastases. The aim of this study was to investigate the correlation between LVI and immunohistochemical expression of two frequently routinely applied immunohistochemical biomarkers, Ki-67 and E-cadherin, in UUT-UC. METHODS: The specimens from 106 patients with UUT-UC who had undergone nephroureterectomy were analyzed for pathologic parameters and LVI, while Ki-67 and E-cadherin expression were assessed by immunohistochemistry. RESULTS: Ki-67 was overexpressed in 38% of the cases, while 45% of tumors demonstrated aberrant E-cadherin staining. The presence of LVI was significantly associated with tumor stage, grade, non-papillary growth, nodular invasion pattern, high Ki-67 labeling index and altered E-cadherin expression. Analyzing logistic regression models, we have shown that tumor properties such as stage, grade, growth and invasion pattern (p < 0.001), as well as the expression of Ki-67 and E-cadherin (p < 0.001) significantly predicted the presence of LVI. In the first model, only solid tumor architecture (p < 0.05) and nodular invasion pattern (p < 0.05) were significant predictors of LVI. In the second model, Ki-67 expression was found to improve the prediction of LVI (p < 0.05). CONSLUSION: Our results suggest that Ki-67 overexpression is an independent predictor of LVI in UUT-UC, indicating the progression of the disease. E-cadherin staining adds no valuable information to LVI probability assessment. This emphasizes the importance of Ki-67 staining of UUT-UC sections in routine pathological practice. Patients with Ki-67 overexpression, especially in solid tumors with nodular invasion, should be monitored more closely after surgery.

Immunohistochemical and morphometric analysis of immunoglobulin light-chain immunoreactive amyloid in psammoma bodies of the human choroid plexus.

The aim of this research was to establish the presence of amyloid and to quantify immunohistochemical reactions of kappa and lambda light chains of psammoma bodies of the choroid plexus. Choroid plexus tissue obtained from 14 right lateral ventricles postmortem was processed histologically and stained with Congo red, thioflavin T, and monoclonal antibodies for kappa and lambda light chains. Morphological analysis was performed with a light microscope at lens magnifications of 4×, 10×, 20×, 25×, and 40×. The morphometric characteristics of psammoma bodies that were kappa and lambda positive and negative were analyzed with ImageJ. Histological analysis showed that the psammoma bodies, stromal blood vessel walls, and some epithelial cells reacted positively with Congo red and thioflavin T. Psammoma bodies were predominantly positive for lambda light chains. Lambda positivity was detected inside some stromal blood vessels, which pointed to a probable systemic origin for these light chains. Morphometric analysis showed that the mean optical densities of lambda- and kappa-positive psammoma bodies were significantly higher than those that gave a negative reaction. The percentage of lambda-positive psammoma bodies was significantly higher than the percentage of lambda-negative psammoma bodies in 80% of the cases, while the reaction with kappa light chains was negative in the majority of the cases. Linear regression analysis showed a significant increase in the percentage of lambda-positive psammoma bodies and their mean optical density with age. Finally, it can be concluded that the positive reaction of psammoma bodies in the choroid plexus with respect to amyloid and lambda light chains may point to the presence of light-chain amyloid in their structures.

Similarities and dissimilarities of the blood supplies of the human sciatic, tibial, and common peroneal nerves.

The aim was to investigate the arterial supply of the sciatic, tibial, and common peroneal nerves. Thirty-six lower limbs of 18 human fetuses were studied. The fetuses had been fixed in buffered formalin and the blood vessels injected with barium sulfate. Fetal age ranged from 12 to 28 weeks of gestation. Microdissection of the fetal lower extremities was done under ×5 magnifying lenses. The sciatic nerves of 10 lower extremities were dissected and excised and radiographs taken. The extraneural arterial chain of the sciatic nerve was composed of 2-6 arterial branches of the inferior gluteal artery, the medial circumflex femoral artery, the perforating arteries, and the popliteal artery. The extraneural arterial chain of tibial nerve was composed of 2-5 arteries, which were branches of the popliteal, the peroneal, and the posterior tibial arteries. Radiographs showed the presence of complete intraneural arterial chains in the sciatic and tibial nerves, formed from anastomosing vessels. Dissection showed that, in 97.2% of the specimens, the common peroneal nerve was supplied only by one popliteal artery branch, the presence of which was confirmed radiologically. The sciatic and tibial nerves are supplied by numerous arterial branches of different origins, which provide for collateral circulation. In contrast, the common peroneal nerve is most frequently supplied only by one elongated longitudinal blood vessel, a branch of the popliteal artery. Such a vascular arrangement may make the common peroneal nerve less resistant to stretching and compression.

Viral infection in renal transplant recipients.

Viruses are among the most common causes of opportunistic infection after transplantation. The risk for viral infection is a function of the specific virus encountered, the intensity of immune suppression used to prevent graft rejection, and other host factors governing susceptibility. Although cytomegalovirus is the most common opportunistic pathogen seen in transplant recipients, numerous other viruses have also affected outcomes. In some cases, preventive measures such as pretransplant screening, prophylactic antiviral therapy, or posttransplant viral monitoring may limit the impact of these infections. Recent advances in laboratory monitoring and antiviral therapy have improved outcomes. Studies of viral latency, reactivation, and the cellular effects of viral infection will provide clues for future strategies in prevention and treatment of viral infections. This paper will summarize the major viral infections seen following transplant and discuss strategies for prevention and management of these potential pathogens.

Morphometric analysis of nonsclerosed Glomeruli size and connective tissue content during the aging process.

Number of sclerotic glomeruli increases during the aging process. Consequently, majority of remained nonsclerosed glomeruli become hypertrophic and some of them sclerotic, too. The aim of this study was to quantify the size and connective tissue content of nonsclerosed glomeruli and to evaluate the percentage of hypertrophic ones in examined human cases during the aging. Material was right kidney's tissue of 30 cadavers obtained during routine autopsies. Cadavers were without previously diagnosed kidney disease, diabetes, hypertension, or any other systemic disease. Tissue specimens were routinely prepared for histological and morphometric analysis. Images of the histological slices were analyzed and captured under 400x magnification with digital camera. Further they were morphometrically and statistically analyzed with ImageJ and NCSS-PASS software. Multiple and linear regression of obtained morphometric parameters showed significant increase of glomerular connective tissue area and percentage. Cluster analysis showed the presence of two types of glomeruli. Second type was characterized with significantly larger size, connective tissue content, and significantly lower cellularity, in relation to the first type. Such glomeruli might be considered as hypertrophic. First type of glomeruli was predominant in younger cases, while second type of glomeruli was predominant in cases older than 55 years.

Morphometric analysis of human sciatic nerve perineurial collagen type IV content.

OBJECTIVES: Aging is the process which unavoidably alters structure and function of the basal membranes in humans. Though, collagen type IV presents the most prominent component of the basal membranes, we estimated its presence in the perineurium of the human sciatic nerve samples during the aging process. MATERIALS AND METHODS: Material was 12 sciatic nerve samples, obtained from cadavers whose age ranged from 36 to 84 years. Cadavers were classified into three age groups: first which age ranged from 35 to 54 years, second which age ranged from 55 to 74 years and third which included cases older than 75 years. Tissue slices were further stained by labeled streptavidin-biotin method with collagen type IV monoclonal antibody and analyzed with light microscope under 100× lens magnification with oil immersion. Digital images of sciatic nerve perineurium were further processed and analyzed with ImageJ software. RESULTS: Our results showed that there is statistically significant increase of perineurial area, perimeter, collagen type IV area, and collagen type IV area per perineurial perimeter unit in the third age group. These parameters also increased in the second age group, but this increase was not significant. Multiple regression analysis showed that beside fascicular size, age more significantly predict perineurial collagen type IV content. CONCLUSIONS: Results of morphometric and statistical analysis pointed to the conclusion that there is significant increase of sciatic nerve perineurial thickness during the aging process. This increase might represent the consequence of perineurial collagen type IV deposition with aging.

Otic artery: a review of normal and pathological features.

Three primitive arteries - the trigeminal, otic and hypoglossal take the names according to their close relation with the V, VIII and XII cranial nerves, while at the cervical level, the first segmental artery is named the primitive proatlantal intersegmental artery. When the human embryo is 4 mm long, these arteries serve as transitory anastomoses between primitive internal carotid arteries and bilateral longitudinal neural arterial plexus, which is the precursor of future basilar artery. Normal and/or abnormal morphofunctional aspects of the prenatal and postnatal forms of the otic artery are described according to the personal and literature data. Many (ab) normal arteries are also noted in differential diagnosis of the otic artery. Postnatally, individual incidence rates of the carotid-vertebrobasilar anastomoses have been found to be inversely related to their order of disappearance. The persistent trigeminal artery has a reported incidence from 0.06-0.6%, whereas the persistent primitive otic artery has been convincingly documented only in minor rates. Persistent carotid-vertebrobasilar anastomoses between the anterior and posterior cranial circulation are important to recognize during angiography for endovascular and surgical planning. Most frequently, the otic artery was an incidental finding.

Psammoma bodies - friends or foes of the aging choroid plexus.

Psammoma bodies are structures classified in the group of dystrophic calcifications, which occur in some kind of tumors and in choroid plexus during the aging process. Despite early discovery of their presence in choroid plexus stroma, mechanisms responsible for their formation remained unclear. Their presence in some kind of tumors was even more extensively studied, but significant breakthrough in the field of their etiology was not attained, too. However, till today correlation between their presence in tumors and aging is not established. Also, there are not any data about structural differences between ones found in tumors and ones found in choroid plexus. This might points to the assumption that besides the aging, some other causes might be involved in their formation in choroid plexus. Furthermore, it is contradictory that forms, like psammoma bodies, present in such malignant formations as tumors, represent quite benign phenomenon in choroid plexus. Literature data and the results of our previous researches revealed that there might be connections between, these, on the first sight quite different processes. Firstly, psammoma bodies are present in stroma of tumors with predominantly papillomatous morphology, which is present in choroid plexus, too. Initial forms of psammoma bodies might be formed in fibrovascular core of choroid plexus villi, similarly like in tumors papillae of papillary thyroid cancer. Their further growth leads to the progressive destruction of both tumors papillae and choroidal villi. Choroid plexus stroma is characterized by the fenestrated blood vessels presence, which are similar to newly formed vessels in tumors. This makes it vulnerable to the noxious agents from circulation. It can contain lymphocytes, macrophages, dendritic cells and myofibroblasts in cases with psammoma bodies, similarly to tumors stroma which is in activated, proinflammatory state. So, all these facts can suggest that similar processes can lead to psammoma bodies formation in both tumors and choroid plexus and, that they might have harmful effect on choroid plexus structure and function during the aging process. Significantly higher degree of choroidal epithelial cells atrophy, in cases with present psammoma bodies proves that partially. Further researches should be focused on detection of osteopontin and nanobacteria, already detected in tumors psammoma bodies, in choroid plexus ones. Discovery of choroidal psammoma bodies mechanisms formation can be important for elucidation of some aspects in pathogenesis of some tumors, too. Application of choroid plexus epithelial cells functional markers in cases with psammoma bodies should show their functional status.

Human fetal medial striate artery or artery of Heubner.

OBJECT: The authors describe some of the features of the medial striate branch or recurrent artery of Heubner (RAH). This structure has indisputable functional, neurological, and neurosurgical significance, and originates from the A(1) and/or A(2) segments of the anterior cerebral artery. METHODS: Microdissection of 94 human fetal specimens was performed. The RAH was observed in 97.3% (single in 71.6%, double in 25.1%, and triple in 3.3%) of the cases. Its origin was from A(2) in 42.3% of specimens, from the A(1)-A(2) junction in 25.7%, and from A(1) in 20%. RESULTS: Five types and 14 subtypes of the RAH were identified, determined based on vessel origin and number. In its course, the RAH gave 1-12 branches, and the terminal part most frequently penetrated into the brain through the anterior perforated substance at the level of the sphenoid segment of the middle cerebral artery. The specimens with a single RAH fenestration, abnormal double RAH anastomosis, and unusual RAH origin and relationship to the surrounding vessels represented new data. CONCLUSIONS: The authors' observations of common anatomical variations in the number and origin of the RAH, as well as its abnormalities, may assist neuroradiologists in the interpretation of diagnostic test results and neurosurgeons in performing procedures in the anterior cerebral circulation.

Morphometric characteristics of choroid plexus epithelial cells in cases with significantly different psammoma bodies' presence.

OBJECTIVES: Taking into the consideration the fact that psammoma bodies have never been observed in stroma of any other organ as aging change, the aim of our research was to prove some structural similarities of choroids plexus and tumors psammoma bodies, and their possible connection with choroids plexus epithelial cells atrophy. MATERIALS AND METHODS: We used 30 cadavers' right lateral ventricle central parts of choroid plexus as material. Tissue samples were routinely processed for the applied histochemical and immunohistochemical stainings. ImageJ software was used for morphometric analysis. RESULTS: Cluster analysis showed the presence of two significantly different groups. The first group included the cases with sparse psammoma bodies and milder epithlelial atrophy with dome cells and vacuoles presence in older cases. The second group included the cases with numerous psammoma bodies and more severe epithelial atrophy, significant cystic formations and epithelial flattening presence, even in younger cases. Immunohistochemical analysis showed positive reaction of psammoma bodies and choroid plexus stroma on S100 protein. Application of S100 A8/A9 marker showed partial positive psammoma bodies' reaction and significant presence of S100 A8/A9 positive cells in choroid plexus blood vessels and stroma, especially, in cases with psammoma bodies' positive reaction on this marker. CONCLUSIONS: So, presence of more numerous psammoma bodies' might be associated with more severe choroids plexus epithelial cells atrophy. Immunohistochemical analysis showed psammoma bodies' positive reaction on S100 protein and the presence of S100 A8/A9 positive cells in stroma of cases with psammoma bodies' positive reaction on this marker.

Normal subtypes of the posterior part of the cerebral arterial circle in human fetuses.

BACKGROUND: Although centuries of the human CAC research are behind us, still there is a stimulus for the authors to describe something new or to add to the "archive" of already known facts about its angioarchitecture. METHODS: With normal configurations of the posterior part of the CAC in early prenatal status, 172 brains of human fetuses from the 13th to the 24th week were used in the purpose of investigation. Brain arteries were injected and microdissected using a surgical microscope. RESULTS: According to diameter values of vascular components in the posterior part of the CAC, 6 basic types and the corresponding number of their subtypes are formed. Incidences of bilateral transitory (18.6%), fetal (9.3%), and adult (33.1%) types, as well bilateral asymmetric types (fetal-transitory in 5.8%, adult-transitory in 14.5%, and adult-fetal in 18.6% of cases), proved that dominant configuration of posterior part had not been present in the period from the fourth to the sixth gestational month. CONCLUSION: The finding of normal subtypes of the posterior part of the CAC, as well as the absence of some subtypes, is a challenge for future studies of the posterior arterial pattern within vascular abnormalities or diseases.

The posterior part of the human cerebral arterial circle (CAC): arterial caliber from gestational weeks 13 to 24.

Numerous studies have reported that all components of the cerebral arterial circle in the 4-month-old human fetus are more slender than adult vessels, and of equal caliber. After that period, a degree of caliber differentiation is present, especially at the level of the posterior communicating arteries. The aim of this study was to determine arterial diameters in the posterior part of the fetal cerebral arterial circle from the 4th month (IV) to the 6th (VI). One hundred and seventy-two fetal cerebral arterial circles were examined by means of a surgical microscope. It was determined that average diameters of the left (right) pre-communicating parts of the posterior cerebral artery ranged from 0.30 +/- 0.03 (0.29 +/- 0.02) mm in month IV, to 0.36 +/- 0.04 (0.36 +/- 0.03) mm during month V and up to 0.55 +/- 0.22 (0.50 +/- 0.18) mm in month VI. The average diameters of the left (right) posterior communicating artery ranged from 0.24 +/- 0.02 mm (0.25 +/- 0.02) in month IV, to 0.30 +/- 0.03 mm (0.29 +/- 0.05) during month V and up to 0.38 +/- 0.08 (0.44 +/- 0.10) in month VI. Gender differences between posterior cerebral artery and posterior communicating artery diameters were not significant. Average posterior cerebral artery diameters were significantly larger than posterior communicating artery diameters in months IV and V, but not in month VI. It was established that caliber differentiation in the posterior part of the cerebral arterial circle began from gestational month IV, and that gender differences in arterial diameters were not significant until month VI of gestation.

Morphometric and some immunohistochemical characteristics of human choroids plexus stroma and psammoma bodies.

Psammoma bodies (PBs) are one of many choroids plexus aging changes. The aim of our research was to perform the quantification of PBs' presence in human choroids plexus stroma, as well as to evaluate the characteristics of choroids plexus stroma in cases in which PBs were present. Afterwards, the observations of the histochemical analysis would be confirmed by immunohistochemical analysis. Choroid plexuses of 30 cadavers were used for the histochemical and, choroids plexuses of 15 cadavers in which PBs' presence was confirmed during the histochemical analysis, were used as material for the immunohistochemical analysis. Light microscopy, histochemical, immunohistochemical, and morphometric method were applied during the study. Classification of the cases was performed by cluster analysis. We observed increase of choroids plexus PBs' presence during the aging process. But this increase is not linear. Their presence is the largest in the second cluster that is younger than the third and older than the first. Nuclear morphometric parameters of the stroma in these cases showed that the cellular composition in this cluster is different than in other two and, that contain larger number of lymphoid cells. Immunohistochemical analysis showed PBs' positive reaction on vimentin, CD45R0, and LCA markers, while in their vicinity, as well as inside them, numerous T-cells were observed. So, the presence of CD45R0 and LCA-positive T cells, PBs' positive reaction on the same markers, indirectly connect these cells with PBs' formation process.