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The histopathological reports of ameloblastoma were categorized as follicular, plexiform, acanthomatous, basal cell, desmoplastic and granular cell types.
Constrictive and complex arteriolar lesions in pulmonary arterial hypertension--plexiform (network of vascular channels lined by endothelial cells with a core of myofibroblasts or less well differentiated cells) and dilation lesion (thin-wall, veinlike vessels distal to plexiform lesion with angiomatoid features) (hematoxylin-eosin, original magnification X80).
In our case, involvement of sacroiliac joint was secondary to juxtaarticular plexiform neurofibroma with massive invasion of the right sacroiliac joint.
Philipsen and coworkers (8) proposed that a hybrid variant was a "transitional" form of the desmoplastic type, comprising the microscopic features of both desmoplastic and "classic" follicular or plexiform variants.
Microscopically hematoxylin and eosin stained section showed cystic lining of variable thickness with prominent hyperchromatic palisading basal layer, along with proliferation of lining in form of plexiform strands (Figure 4).
In addition, the same study group revealed that mean, superior, and inferior RNFL were thinner in smokers than control group, but ganglion cell-inner plexiform layer complex (GCIPL) exhibited no significant difference between two groups [26].
Also, plexiform NFs are associated with a higher rate of malignant transformation at 10-15%[9].
5) Neurofibromas are the most characteristic lesion (10) representative of this disorder and they can be divided into three types depending on their clinical and histopathological characteristics (5): cutaneous (found in 95% of patients), nodular and plexiform neurofibromas.
NF-1 is characterized by cutaneous and plexiform neurofibromas, skin pigmentation (axillary and inguinal freckling, cafe-au-lait spots), Lisch nodules, optic glioma or skeletal dysplasias [4, 5].
It very often takes the form of a conflict, very often a deep and violent conflict, resulting in trauma that can last for decades, be passed over from generation to generation, and express itself in plexiform manner.
ANSWER: plexiform arterial lesion (Grade IV) indicative of pulmonary hypertension
Besides, another reason for ureteroureterostomy rarely being introduced to repair lower ureteral injury was that distal ureters had a relatively poor vascular and blood supply while the pelvic ureter appears to have a high preponderance of plexiform vessels, which has been considered susceptible to ischemia after transection [12].