Fibrous tissue, fibrosis, and the fibroblast

2022 ◽  
pp. 1-15
Author(s):  
Giulio Gabbiani ◽  
Matteo Coen ◽  
Fabio Zampieri
Keyword(s):  
Fibrous Tissue ◽  
Tissue Fibrosis

Ultrastructural diagnosis of plasmacytoma on a fine-needle aspirate

1991 ◽  
Vol 49 ◽  
pp. 102-103
Author(s):  
S. Siew ◽  
W. deMendonca-Calaca
Keyword(s):  
Mononuclear Cells ◽  
Fibrous Tissue ◽  
Needle Aspiration ◽  
Focal Lesions ◽  
Diffuse Infiltration ◽  
Fine Needle ◽  
Cytoplasmic Vacuolation ◽  
Chest Mass ◽  
Mitotic Figures ◽  
Microscopy Examination

A 36 year old man presented with a mass in the chest and multiple “hot” focal lesions were identified on bone scan. Fine needle aspiration was performed of the chest mass. Routine histology showed the presence of some bundles of dense fibrous tissue and a diffuse infiltration of mononuclear cells, which varied in size and nucleo-cytoplasmic ratio. The smaller cells had eccentric hyperchromatic nuclei. Nucleoli were noted in the larger cells. There was well marked cytoplasmic vacuolation of some of the cells. Mitosis was present. A small fragment of tissue was received for electron microscopy. Examination of 1 μm sections showed trabeculae of medium-large polygonal cells with eccentric nuclei and occasional nucleoli. Some irregularly shaped cells had well marked cytoplasmic vacuolation. Mitotic figures were present.

Adenomatoid Tumor of the Testis, A Mesonephric Hamartoma

1971 ◽  
Vol 29 ◽  
pp. 318-319
Author(s):  
Raoul Fresco ◽  
Mary Chang-Lo
Keyword(s):  
Electron Microscopy ◽  
Epithelial Cells ◽  
Fibrous Tissue ◽  
Salient Feature ◽  
Luminal Surface ◽  
Adenomatoid Tumor ◽  
Ultrastructural Studies ◽  
Epithelial Origin ◽  
Brush Borders ◽  
Cell Processes

Confusion surrounds the nature of the “adenomatoid tumor” of the testis, as evidenced by the large number of synonyms which have been ascribed to it. Various authors have considered the tumor to be of endothelial, mesothelial or epithelial origin. There appears to be no controversy as to the stromal elements of the tumor, which consists mainly of smooth muscle and fibrous tissue. It is the irregular gland-like spaces which have given rise to the numerous theories as to its histogenesis, and even recent ultrastructural studies fail to agree on the origin of these structures.Electron microscopy of a typical intrascrotal adenomatoid tumor showed the gland-like spaces to be lined by epithelial cells (Fig. 1), rich in cytoplasmic tonofibrils and united to each other by numerous desmosomes (Fig. 2). The most salient feature of these epithelial cells was the presence on their luminal surface of numerous long and repeatedly branching microvillous structures of the type known as stereocilia (Fig. 3). These are extremely long slender cell processes which are as much as three to four times the length of those in brush borders.

Pseudoaneurysm of the brachial artey in two infants following accidental artertial puncture

VASA ◽  
2005 ◽  
Vol 34 (3) ◽  
pp. 198-200 ◽  
Author(s):  
Yilmaz ◽  
Dogan ◽  
Tok ◽  
Hazirolan ◽  
Guvener ◽  
...  
Keyword(s):  
Blunt Trauma ◽  
Vascular Access ◽  
Brachial Artery ◽  
Fibrous Tissue ◽  
Arterial Puncture ◽  
Artery Pseudoaneurysm

A pseudoaneurysm is defined as an aneurysmatic sac surrounded by fibrous tissue instead of other vascular layers such as the muscular one. It is a rare incident in infants especially in the brachial artery. Blunt trauma and vascular access attempts are the most common etiologic factors. We present two infants with brachial artery pseudoaneurysm in the antecubital region following accidental arterial puncture.

Cystic Bone Lesions in Horses and Humans: A Comparative Review

1998 ◽  
Vol 11 (01) ◽  
pp. 08-18 ◽  
Author(s):  
C. W. McIlwraith ◽  
J. A. Auer ◽  
Brigitte von Rechenberg
Keyword(s):  
Recurrence Rate ◽  
Subchondral Bone ◽  
Fibrous Tissue ◽  
Clinical Signs ◽  
Bone Lesions ◽  
Anatomical Location ◽  
Cystic Lesions ◽  
Bone Cysts ◽  
Biological Behaviour ◽  
Comparative Review

SummaryCases of cystic bone lesions in horses and humans were reviewed in the literature. These lesions are radiolucent areas of bone, recognized as subchondral cystic lesions in the horse (SCL), intra-osseous ganglia (IOG), subchondral bone cysts secondary to osteoarthrosis (OAC), and unicameral bone cysts (UCB) in humans. Their morphology is quite similar, consisting of lesions with a distinct cyst wall, and a cavity filled with fibrous tissue and yellowish mucoid fluid. The lesions are surrounded by sclerotic bone and can be easily diagnosed radiographically. SCL, IOG and OAC occur in the subchondral bone close to the adjacent joint, whereas UCB occur in the metaphysis of long bones. Their aetiology and pathogenesis is still unknown, although primary damage to the subchondral bone, cartilage or local blood supply and growth disturbances are discussed. In this review 703 lesions of SCL in horses, 289 lesions of IOG and 1460 lesions of UCB in humans were compared in their anatomical location and clinical signs. SCL and OAC resembled each other with respect to anatomical location. A correlation of affected bones could not be found for all four groups. Clinical presentation concerning age was most similar for SCL and UCB with both lesions mainly occurring in young individuals. Gender predominance of males was present in SCL, IOG and UCB. Clinical diagnosis was either incidental, or connected with intermittent pain in all lesions except for OAC. Additionally, the lesions were also found in conjunction with degenerative joint disease (SCL, OAC) or pathological fractures (UCB). Cystic bone lesions were either treated conservatively, surgically with curettage alone, curettage in combination with grafting procedures, or intra-lesional application of corticosteroids. SCL and UCB were similar in their biological behaviour concerning their slow response to the therapy and relatively high recurrence rate. None of the cystic bone lesions were comparable, and a common aetiology and pathogenesis could not be found.In a literature review cases of cystic bone lesions in horses and humans were compared with the goal to find a common aetiology and pathogenesis. Cystic bone lesions occur in horses as subchondral cystic lesions (SCL), and in humans as either intra-osseous ganglia (IOG), subchondral cystic lesions secondary to osteoarthrosis (OAC) or unicameral bone cysts (UCB). IOG and OAC compare with SCL mainly in the anatomical location. IOG and SCL resemble each other in size, clinical signs and histology, whereas UCB and SCL show a similar biological behaviour regarding their therapeutic response and recurrence rate. None of the cystic bone lesions in humans were comparable to the SCL in horses in all aspects. A common aetiology and pathogenesis could not be established.

The Effect of Total Meniscectomy versus Caudal Pole Hemimeniscectomy on the Stifle Joint of the Sheep

1999 ◽  
Vol 12 (02) ◽  
pp. 56-63 ◽  
Author(s):  
C. R. Bellenger ◽  
P. Ghosh ◽  
Y. Numata ◽  
C. Little ◽  
D. S. Simpson
Keyword(s):  
Tissue Culture ◽  
Articular Cartilage ◽  
Fibrous Tissue ◽  
Cartilage Degeneration ◽  
Medial Compartment ◽  
Proteoglycan Synthesis ◽  
Stifle Joint ◽  
Medial Meniscectomy ◽  
Tibial Condyle ◽  
Articular Cartilage Degeneration

SummaryTotal medial meniscectomy and caudal pole hemimeniscectomy were performed on the stifle joints of twelve sheep. The two forms of meniscectomy produced a comparable degree of postoperative lameness that resolved within two weeks of the operations. After six months the sheep were euthanatised and the stifle joints examined. Fibrous tissue that replaced the excised meniscus in the total meniscectomy group did not cover as much of the medial tibial condyle as the residual cranial pole and caudal fibrous tissue observed following hemimeniscectomy. The articular cartilage from different regions within the joints was examined for gross and histological evidence of degeneration. Analyses of the articular cartilage for water content, glycosaminoglycan composition and DNA content were performed. The proteoglycan synthesis and release from explanted articular cartilage samples in tissue culture were also measured. There were significant pathological changes in the medial compartment of all meniscectomised joints. The degree of articular cartilage degeneration that was observed following total meniscectomy and caudal pole meniscectomy was similar. Caudal pole hemimeniscectomy, involving transection of the meniscus, causes the same degree of degeneration of the stifle joint that occurs following total meniscectomy.The effect of total medial meniscectomy versus caudal pole hemimeniscectomy on the stifle joint of sheep was studied experimentally. Six months after the operations gross pathology, histopathology, cartilage biochemical analysis and the rate of proteoglycan synthesis in tissue culture were used to compare the articular cartilage harvested from the meniscectomised joints. Degeneration of the articular cartilage from the medial compartment of the joints was present in both of the groups. Caudal pole hemimeniscectomy induces a comparable degree of articular cartilage degeneration to total medial meniscectomy in the sheep stifle joint.

RESULTS OF SURGICAL TREATMENT OF PATIENTS WITH CHRONIC PANCREATITIS AND THE RISK OF CANCER AFTER SURGICAL TREATMENT

2018 ◽  
Vol 64 (2) ◽  
pp. 228-233
Author(s):  
Vladimir Lubyanskiy ◽  
Vasiliy Seroshtanov ◽  
Ye. Semenova
Keyword(s):  
Pancreatic Cancer ◽  
Chronic Pancreatitis ◽  
Surgical Treatment ◽  
Fibrous Tissue ◽  
Pancreatic Head ◽  
Head Region ◽  
Intestinal Anastomoses ◽  
Resection Of The Pancreas ◽  
Risk Of Cancer

The aim: To analyze results of surgical treatment of patients with chronic pancreatitis (CP) and to assess the causes of pancreatic cancer after surgical treatment. Materials and methods: 137 patients had duodenum-preserving resections of the pancreas. Results: In the histological examination of the pancreas it was established that the growth of fibrous tissue was registered in patients with CP., which in 19 (13.8%) almost completely replaced the acinar tissue. In the long term after the operation from 6 months to 2 years in 8 patients (5.8%) pancreatic cancer was detected. Possible causes of tumor origin were analyzed, the value of preservation of ductal hypertension, which affects the state of the duct’s epithelium, was established. The most commonly used for treatment of chronic pancreatitis the Frey surgery removed pancreatic hypertension but in two patients during the operation an insufficient volume of the pancreatic head was reconstructed. In the case of the abandonment of a large array of fibrous tissue, local hypertension was retained in the region of the ductal structures of the head, which led to the transformation of the duct epithelium. An essential factor in the problem of the preservation of pancreatic hypertension were the stenosis of pancreatic intestinal anastomoses, they arose in the long term in 4 operated patients. With stenosis of anastomosis after duodenum-preserving resection both the hypertension factor and the regeneration factor could be realized, which under certain circumstances might be significant. Conclusion: After resection of the pancreas for CP cancer was diagnosed in 5.8% of patients. The main method of preventing the risk of cancer was performing the Frey surgery for CP eliminating pancreatic hypertension in the head region of the pancreas. Diagnosis of stenosis in the late period after resection of the pancreas was an important element in the prevention of recurrence of cancer since a timely reconstructive operation could improve the drainage of duct structures.

Differential Roles of Cysteinyl Cathepsins in TGF-β Signaling and Tissue Fibrosis

2019 ◽  
Author(s):  
Xian Zhang ◽  
Yi Zhou ◽  
Qin Huang ◽  
Wenqian Fang ◽  
Jie Li ◽  
...  
Keyword(s):  
Tissue Fibrosis
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