Mubeen Sarwar - Academia.edu (original) (raw)
Papers by Mubeen Sarwar
Plant Disease, 2014
In May 2010, canker and wood stain symptoms in trunks and stems of 125 Acacia mangium were observ... more In May 2010, canker and wood stain symptoms in trunks and stems of 125 Acacia mangium were observed during a survey conducted in the Uverito plantations, Monagas State, Venezuela. Cankers were 20 to 65 cm long and were brownish on the margins and dark brown in the center. Many of the cankers had swollen margins and in some cases a black exudate could be seen leaking from the most severe cankers. Small pieces (4 to 5 mm) of necrotic tissues from the cankers were surface sterilized for 1 min in 1.5% NaOCl, washed twice with sterile distilled water, and plated onto potato dextrose agar amended with 0.01% tetracycline hydrochloride (PDA-tet). Plates were incubated at 25°C under near-UV light. Colonies developed from symptomatic tissue and formed a compact mycelium, which was initially white, but became dark gray with age. Based on colony morphology, isolates were tentatively identified as a member of the Botryosphaeriaceae family. Pycnidia were produced on sterilized pine needles on 2% ...
Radiology, 1983
Forty patients with neurological deficits from cervical spine trauma had cervical myelography wit... more Forty patients with neurological deficits from cervical spine trauma had cervical myelography with metrizamide, gas, iophendylate, or a combination thereof. At a low dosage (less than or equal to 1.25 g I), metrizamide was found to be not only the most effective in demonstrating the spinal cord but also safe if used with a C-arm biplane fluoroscopic unit which has tomographic capability.
AJNR. American journal of neuroradiology
The computed tomographic (CT) findings of arteriovenous malformations of the brain have been well... more The computed tomographic (CT) findings of arteriovenous malformations of the brain have been well described [1-5]. Recently, Daniels et al. [6] reported three cases of arteriovenous malformations with cystic cavities on CT due to hematoma liquefaction , an unusual finding. We report three cases of ruptured arteriovenous malformations associated with blood-fluid levels within cystic cavities. Case Reports Case 1 A 64-year-old woman , in previous good health except for a questionable history of mild hypertension, complained of frontal headache with nausea and dizziness on the evening before admission. She was found unresponsive the next morning. Physical examination revealed a left hemiparesis and a blood pressure of 150/ 64 mm Hg. CT revealed a large frontal intracerebral hematoma with minimal shift. Layering of blood within a cystic cavity below the hematoma was noted (Fig. 1). There was no enhancement after administering a 100 ml bolus injection of meglumine diatrizoate (Renografin 60). Because of rapid deterioration , the patient was taken immediately Fig. 1.-Case 1. A, Noncontrast scan. Blood-fluid level in cystic space and mass effect in right frontal lobe. B, Layering effect preserved with head tilted. C , High er section. Larg e hematoma abuts blood-fluid level.
Radiology, 1984
The authors describe 2 diffusely invasive prolactin-secreting pituitary adenomas which produced m... more The authors describe 2 diffusely invasive prolactin-secreting pituitary adenomas which produced marked destruction of the base of the skull thought to be diagnostic of chordoma on computed tomography (CT). Failure to recognize this pattern led to biopsy, which was diagnostic. The authors emphasize the need to recognize this rare growth pattern of diffusely invasive pituitary adenoma on CT.
AJNR. American journal of neuroradiology
Primary tethered cord syndrome is defined as low placement of the spinal cord and thickened filum... more Primary tethered cord syndrome is defined as low placement of the spinal cord and thickened filum terminale with associated anomalies. This definition excludes anomalies concomitant with overt myelomeningocele and spinal cord tethering secondary to myelomeningocele repair. Embryologically, the primary tethered cord syndrome is an entirely different entity from overt myelomeningocele and associated Arnold-Chiari type II malformation, but its origins have not been satisfactorily explained. The authors postulate that primary tethered cord syndrome is a manifestation of local dysmorphogenesis of all three germ layers at the lumbosacral area, possibly triggered by a hemorrhagic, inflammatory, or some other local lesion occurring in embryogenesis.
AJNR. American journal of neuroradiology
To demonstrate the phylogenetic changes that have led to the current form of the human skull, dri... more To demonstrate the phylogenetic changes that have led to the current form of the human skull, dried skulls of various representative vertebrates were examined using plain radiography and high-resolution computed tomography. The latter was chosen rather than pluridirectional tomography in anticipation of its future role as the major method for imaging the skull base. The phylogenetic history of the human skull is reviewed by considering separately the evolution of the calvarium, zygomatic arch, palate, jaw, and skull base.
Radiology, 1987
The presence of the empty delta sign on contrast material-enhanced computed tomographic (CT) scan... more The presence of the empty delta sign on contrast material-enhanced computed tomographic (CT) scans of the brain is considered pathognomonic of sagittal sinus thrombosis (SST); however, a valid explanation for its appearance is lacking, despite several hypotheses. To determine the frequency of the sign and its prognostic significance, 76 reported cases (112 CT manifestations) of SST and SST-related intracranial sinovenous occlusive disease were reviewed. Ten CT signs related to both disease processes were reported; the empty delta sign was the most frequently reported sign (28.6%) of SST. Patients with hemorrhagic infarction and/or the empty delta sign on CT scans had the poorest prognosis. A case illustrative of the empty delta sign is described in which there was engorgement of endothelial- and nonendothelial-lined spaces in the dura mater with hemorrhagic rupture into the dural leaf. The empty delta sign can probably be explained on the basis of the rich dural venous collateral ci...
American Journal of Ophthalmology, 1984
Surgical Neurology, 1982
A case of dolichoectasia of the vertebrobasilar system and carotid arteries is presented. Feature... more A case of dolichoectasia of the vertebrobasilar system and carotid arteries is presented. Features considered unique to this case include recurrence of trigeminal neuralgia after a standard surgical procedure, presumably caused by rapidly progressing dolichoectasia of the vertebrobasilar arteries, and progressive calcification and ventriculomegaly over the course of one and a half years, shown on sequential computed tomographic (CT) scans. Dolichoectasia is discussed briefly as a clinical entity and its characteristic CT scan findings are reviewed.
Pediatric Radiology, 1984
We describe a newborn with multiple congenital anomalies due to the Amniotic Band Disruption Comp... more We describe a newborn with multiple congenital anomalies due to the Amniotic Band Disruption Complex. Cerebral computerized tomography and plain films of the extremities corroborated the clinical diagnosis. The purpose of this case report is to alert the radiologist to the varied radiographic appearance of this little known entity and to provide a historical and embryologic background.
Pediatric Radiology, 1985
Several intracranial tumors are known to occur in conjunction with agenesis of the corpus callosu... more Several intracranial tumors are known to occur in conjunction with agenesis of the corpus callosum. We report the occurence of a teratoma with callosal agenesis, an association not previously described, and suggest that the tumor's ventral location may serve to differentiate it from other lesions.
Journal of Computer Assisted Tomography, 1983
This study of 34 normal ears was conducted in order to define more precisely the normal computed ... more This study of 34 normal ears was conducted in order to define more precisely the normal computed tomographic (CT) anatomy of the osseous external auditory canal. Great variability was found in canal configuration and its relationship to the temporal squama. The understanding of normal CT appearance of the various fissures along the anterior wall of the external canal is important to avoid mistaking fissures for fractures.
Journal of Computer Assisted Tomography, 1985
We examined 11 human fetuses (18 to 30 weeks' gestation) with high resolution CT ... more We examined 11 human fetuses (18 to 30 weeks' gestation) with high resolution CT to study the developmental ossification of the two main component structures of the skull base, the temporal and sphenoid bones. Computed tomography, with its excellent contrast discrimination, allowed clear visualization of the morphology of ossifying centers. Skull base growth during this gestational period was found to be a dynamic event with rapid changes in morphology and interosseous relationships. The growth of the sphenoid body on CT corroborates the studies done by Kodama, who used dehydrated skulls. The temporal bone proceeded in a stepwise fashion; complete encapsulation of the membranous labyrinth occurred before it grew anteroposteriorly to form the apex and mastoid.
American Journal of Roentgenology, 1985
The pneumatizatlon of 141 "normal" temporal bones on computed tomography (CT) was evaluated in 10... more The pneumatizatlon of 141 "normal" temporal bones on computed tomography (CT) was evaluated in 100 patients (age range, 6-85 years). Because of the controversy surrounding the sclerotic squamomastoid (mastoid),
American Journal of Roentgenology, 1982
American Journal of Otolaryngology, 1983
High-resolution computed tomography (CT) was performed on the temporal bones of 93 patients in co... more High-resolution computed tomography (CT) was performed on the temporal bones of 93 patients in conjunction with pluridirectional tomography. The majority of the patients were scanned on the prototype Pfizer 0200 FS second-generation scanner, modified to meet the demands of high-resolution scanning. Images from this relatively economical scanner are almost comparable to those obtainable with the GE CT/T 8800 scanner in spatial and contrast resolution. CT scans of the temporal bone were found to be more sensitive than pluridirectional tomography in visualizing fractures and soft tissue masses in the middle ear, including fluid levels and tympanic membrane swelling. It is concluded that high-resolution CT of the temporal bone will probably soon entirely replace pluridirectional tomography.
Plant Disease, 2014
In May 2010, canker and wood stain symptoms in trunks and stems of 125 Acacia mangium were observ... more In May 2010, canker and wood stain symptoms in trunks and stems of 125 Acacia mangium were observed during a survey conducted in the Uverito plantations, Monagas State, Venezuela. Cankers were 20 to 65 cm long and were brownish on the margins and dark brown in the center. Many of the cankers had swollen margins and in some cases a black exudate could be seen leaking from the most severe cankers. Small pieces (4 to 5 mm) of necrotic tissues from the cankers were surface sterilized for 1 min in 1.5% NaOCl, washed twice with sterile distilled water, and plated onto potato dextrose agar amended with 0.01% tetracycline hydrochloride (PDA-tet). Plates were incubated at 25°C under near-UV light. Colonies developed from symptomatic tissue and formed a compact mycelium, which was initially white, but became dark gray with age. Based on colony morphology, isolates were tentatively identified as a member of the Botryosphaeriaceae family. Pycnidia were produced on sterilized pine needles on 2% ...
Radiology, 1983
Forty patients with neurological deficits from cervical spine trauma had cervical myelography wit... more Forty patients with neurological deficits from cervical spine trauma had cervical myelography with metrizamide, gas, iophendylate, or a combination thereof. At a low dosage (less than or equal to 1.25 g I), metrizamide was found to be not only the most effective in demonstrating the spinal cord but also safe if used with a C-arm biplane fluoroscopic unit which has tomographic capability.
AJNR. American journal of neuroradiology
The computed tomographic (CT) findings of arteriovenous malformations of the brain have been well... more The computed tomographic (CT) findings of arteriovenous malformations of the brain have been well described [1-5]. Recently, Daniels et al. [6] reported three cases of arteriovenous malformations with cystic cavities on CT due to hematoma liquefaction , an unusual finding. We report three cases of ruptured arteriovenous malformations associated with blood-fluid levels within cystic cavities. Case Reports Case 1 A 64-year-old woman , in previous good health except for a questionable history of mild hypertension, complained of frontal headache with nausea and dizziness on the evening before admission. She was found unresponsive the next morning. Physical examination revealed a left hemiparesis and a blood pressure of 150/ 64 mm Hg. CT revealed a large frontal intracerebral hematoma with minimal shift. Layering of blood within a cystic cavity below the hematoma was noted (Fig. 1). There was no enhancement after administering a 100 ml bolus injection of meglumine diatrizoate (Renografin 60). Because of rapid deterioration , the patient was taken immediately Fig. 1.-Case 1. A, Noncontrast scan. Blood-fluid level in cystic space and mass effect in right frontal lobe. B, Layering effect preserved with head tilted. C , High er section. Larg e hematoma abuts blood-fluid level.
Radiology, 1984
The authors describe 2 diffusely invasive prolactin-secreting pituitary adenomas which produced m... more The authors describe 2 diffusely invasive prolactin-secreting pituitary adenomas which produced marked destruction of the base of the skull thought to be diagnostic of chordoma on computed tomography (CT). Failure to recognize this pattern led to biopsy, which was diagnostic. The authors emphasize the need to recognize this rare growth pattern of diffusely invasive pituitary adenoma on CT.
AJNR. American journal of neuroradiology
Primary tethered cord syndrome is defined as low placement of the spinal cord and thickened filum... more Primary tethered cord syndrome is defined as low placement of the spinal cord and thickened filum terminale with associated anomalies. This definition excludes anomalies concomitant with overt myelomeningocele and spinal cord tethering secondary to myelomeningocele repair. Embryologically, the primary tethered cord syndrome is an entirely different entity from overt myelomeningocele and associated Arnold-Chiari type II malformation, but its origins have not been satisfactorily explained. The authors postulate that primary tethered cord syndrome is a manifestation of local dysmorphogenesis of all three germ layers at the lumbosacral area, possibly triggered by a hemorrhagic, inflammatory, or some other local lesion occurring in embryogenesis.
AJNR. American journal of neuroradiology
To demonstrate the phylogenetic changes that have led to the current form of the human skull, dri... more To demonstrate the phylogenetic changes that have led to the current form of the human skull, dried skulls of various representative vertebrates were examined using plain radiography and high-resolution computed tomography. The latter was chosen rather than pluridirectional tomography in anticipation of its future role as the major method for imaging the skull base. The phylogenetic history of the human skull is reviewed by considering separately the evolution of the calvarium, zygomatic arch, palate, jaw, and skull base.
Radiology, 1987
The presence of the empty delta sign on contrast material-enhanced computed tomographic (CT) scan... more The presence of the empty delta sign on contrast material-enhanced computed tomographic (CT) scans of the brain is considered pathognomonic of sagittal sinus thrombosis (SST); however, a valid explanation for its appearance is lacking, despite several hypotheses. To determine the frequency of the sign and its prognostic significance, 76 reported cases (112 CT manifestations) of SST and SST-related intracranial sinovenous occlusive disease were reviewed. Ten CT signs related to both disease processes were reported; the empty delta sign was the most frequently reported sign (28.6%) of SST. Patients with hemorrhagic infarction and/or the empty delta sign on CT scans had the poorest prognosis. A case illustrative of the empty delta sign is described in which there was engorgement of endothelial- and nonendothelial-lined spaces in the dura mater with hemorrhagic rupture into the dural leaf. The empty delta sign can probably be explained on the basis of the rich dural venous collateral ci...
American Journal of Ophthalmology, 1984
Surgical Neurology, 1982
A case of dolichoectasia of the vertebrobasilar system and carotid arteries is presented. Feature... more A case of dolichoectasia of the vertebrobasilar system and carotid arteries is presented. Features considered unique to this case include recurrence of trigeminal neuralgia after a standard surgical procedure, presumably caused by rapidly progressing dolichoectasia of the vertebrobasilar arteries, and progressive calcification and ventriculomegaly over the course of one and a half years, shown on sequential computed tomographic (CT) scans. Dolichoectasia is discussed briefly as a clinical entity and its characteristic CT scan findings are reviewed.
Pediatric Radiology, 1984
We describe a newborn with multiple congenital anomalies due to the Amniotic Band Disruption Comp... more We describe a newborn with multiple congenital anomalies due to the Amniotic Band Disruption Complex. Cerebral computerized tomography and plain films of the extremities corroborated the clinical diagnosis. The purpose of this case report is to alert the radiologist to the varied radiographic appearance of this little known entity and to provide a historical and embryologic background.
Pediatric Radiology, 1985
Several intracranial tumors are known to occur in conjunction with agenesis of the corpus callosu... more Several intracranial tumors are known to occur in conjunction with agenesis of the corpus callosum. We report the occurence of a teratoma with callosal agenesis, an association not previously described, and suggest that the tumor's ventral location may serve to differentiate it from other lesions.
Journal of Computer Assisted Tomography, 1983
This study of 34 normal ears was conducted in order to define more precisely the normal computed ... more This study of 34 normal ears was conducted in order to define more precisely the normal computed tomographic (CT) anatomy of the osseous external auditory canal. Great variability was found in canal configuration and its relationship to the temporal squama. The understanding of normal CT appearance of the various fissures along the anterior wall of the external canal is important to avoid mistaking fissures for fractures.
Journal of Computer Assisted Tomography, 1985
We examined 11 human fetuses (18 to 30 weeks' gestation) with high resolution CT ... more We examined 11 human fetuses (18 to 30 weeks' gestation) with high resolution CT to study the developmental ossification of the two main component structures of the skull base, the temporal and sphenoid bones. Computed tomography, with its excellent contrast discrimination, allowed clear visualization of the morphology of ossifying centers. Skull base growth during this gestational period was found to be a dynamic event with rapid changes in morphology and interosseous relationships. The growth of the sphenoid body on CT corroborates the studies done by Kodama, who used dehydrated skulls. The temporal bone proceeded in a stepwise fashion; complete encapsulation of the membranous labyrinth occurred before it grew anteroposteriorly to form the apex and mastoid.
American Journal of Roentgenology, 1985
The pneumatizatlon of 141 "normal" temporal bones on computed tomography (CT) was evaluated in 10... more The pneumatizatlon of 141 "normal" temporal bones on computed tomography (CT) was evaluated in 100 patients (age range, 6-85 years). Because of the controversy surrounding the sclerotic squamomastoid (mastoid),
American Journal of Roentgenology, 1982
American Journal of Otolaryngology, 1983
High-resolution computed tomography (CT) was performed on the temporal bones of 93 patients in co... more High-resolution computed tomography (CT) was performed on the temporal bones of 93 patients in conjunction with pluridirectional tomography. The majority of the patients were scanned on the prototype Pfizer 0200 FS second-generation scanner, modified to meet the demands of high-resolution scanning. Images from this relatively economical scanner are almost comparable to those obtainable with the GE CT/T 8800 scanner in spatial and contrast resolution. CT scans of the temporal bone were found to be more sensitive than pluridirectional tomography in visualizing fractures and soft tissue masses in the middle ear, including fluid levels and tympanic membrane swelling. It is concluded that high-resolution CT of the temporal bone will probably soon entirely replace pluridirectional tomography.