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   2001| October-December  | Volume 11 | Issue 4  
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Value of dynamic MRI imaging in pituitary adenomas
IK Indrajit, N Chidambaranathan, K Sundar, I Ahmed
October-December 2001, 11(4):185-190
Objectives : MRI has proven to be the best imaging modality in the evaluation of pituitary tumors. Dynamic Imaging is technically a new tool, which has emerged with lot of promise in the evaluation of pituitary adenomas, particularly in accurate delineation of those microadenomas with no contour abnormality and in differentiating residual/recurrent adenoma from surrounding post operative tissue. Dynamic MR imaging is not only useful in the evaluation of pituitary microadenomas but has an equally important role in the assessment of macroadenoma as well. This study analyses and reviews the value of dynamic MR Imaging in pituitary adenomas and postoperative pituitary tumors. Materials and Methods : A prospective MR Study was undertaken in twenty-five consecutive patients with suspected pituitary adenomatous lesions. These patients were subjected to dynamic MR imaging at our Department from Jan 1997 to Dec 1998. The study was performed on a 0.5T super conducting MR imaging system with Fast Spin echo technique. Gadodiamide (0.1 mmol/Kg) was administered over sixty seconds by hand injection. Dynamic coronal images were obtained simultaneously from three different portions of the gland. Fifteen images were obtained from each of the three portions at an interval of twenty to thirty seconds between the images. Result : Dynamic MRI was performed in nineteen patients with microadenoma and six cases of macroadenoma. Dynamic MRI study was of diagnostic value in comparison with routine contrast MRI in eleven of the nineteen patients. Dynamic study did not add to the diagnosis and was merely of confirmatory value in remaining eight patients. Dynamic MRI study was used to identify the optimal time for delineation of the adenomatous tumor, by virtue view of the simultaneous differential contrast enhancement patterns between normal pituitary gland and adenoma. Further the enhancement pattern of the normal pituitary gland, the adenomatous nodule and the optimal delineation were individually assessed. This evaluation revealed the average time in seconds for onset of enhancement and the peak enhancement of normal pituitary gland were 43.1 and 111.9 seconds respectively. In comparison the pituitary adenomatous nodules exhibited an average time of 105.8 seconds for onset of enhancement and 188.1 seconds for peak enhancement. The average time in seconds for optimal tumor delineation was 93.9 seconds. Conclusion : Dynamic MR Imaging has emerged as a technically refined tool in the evaluation of pituitary adenomas. The key questions in evaluation of pituitary adenomas include the presence or absence of a tumor, the number, the location of adenoma nodule, the invasive effects on adjacent structures and the post therapy status of adenoma. Clearly, dynamic MR Imaging is the foremost imaging modality answering these vital questions in patients with pituitary adenomas.
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Pictorial essay : Mammographic features of breast cancer
MB Popli
October-December 2001, 11(4):175-179
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Radiation doses to patients from X-ray examinations involving fluoroscopy
G Ramakrishnan, V Padmanabhan
October-December 2001, 11(4):181-184
Objectives : X-rays used in medical diagnosis contribute a major share to population doses from man-made sources of radiation. This paper attempts to measure the patient and organ doses in patients undergoing some special procedures involving fluoroscopy.Materials and Methods : Radiation doses received by 93 patients undergoing five special procedures (Barium Swallow, Barium Meal, Barium Enema, IVP and myelograms) were measured with CaSO4-Dy thermo luminescent dosimeters following standard TLD Procedures. Doses to critical organs like ovary, testes and thyroid were estimated by applying suitable correction factors. Result : The study revealed a maximum surface dose 75.92 mSv for barium meal study. The ovary doses were significant for Barium meal enema, and myelograms. Conclusion : The dose levels as measured by this study were significant but not alarming. Attempts could be made to lower the doses received during these procedures.
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Thoracic sarcoidosis : The spectrum of roentgenologic appearances
D Deepak, A Shah
October-December 2001, 11(4):191-198
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Idiopathic hypoparathyroidism
H Singh, P Muthaiah
October-December 2001, 11(4):222-223
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Image : Whirlpool sign-midgut volvulus (An US diagnosis)
S Magu, KN Rattan, N Sharma
October-December 2001, 11(4):205-206
  5,633 0 1
Antenatal Ultrasound diagnosis of Meckel-Gruber syndrome
N Dahiya, S Vijay, S Prabhakar, S Subhramaniam, Neha Dahiya
October-December 2001, 11(4):199-201
  5,585 0 1
Congenital perineal hernia : Radiographic findings and role of imaging in diagnosis
L Upreti, SK Bhargava, A Kumar
October-December 2001, 11(4):217-218
  5,463 0 -
Cervical ganglioneuroma
NLN Moorthy, G Bhaskar, N Venkatakumar, V Sharada
October-December 2001, 11(4):220-221
  3,910 0 -
Vertebral artery pseudoaneurysm : A rare complication of transoral needle aspiration of retropharyngeal abscess
SK Puri, P Narang, D Singh, P Panigrahi, S Gupta
October-December 2001, 11(4):218-220
  3,596 0 -
DS Shetty, BN Lakhkar, S Abubacker
October-December 2001, 11(4):203-204
  2,589 0 -
Radiological quiz-abdominal
P Issar, SK Issar, MK Dwivedi, R Prasad
October-December 2001, 11(4):215-216
  2,545 0 -
Radiological quiz-abdominal
K Saggar, R Goyal, SC Goyal, K Goel
October-December 2001, 11(4):211-212
  2,543 0 -
Radiological quiz-musculoskeletal
S Pungavkar, D Patkar, J Shah, SV Kothari
October-December 2001, 11(4):207-209
  2,496 0 -
Radiological quiz-neuroradiology
BK Parameswaran, AK Gupta, S Joseph, TR Kapilamoorthy, B Thomas
October-December 2001, 11(4):213-214
  2,261 0 -
Arcot Gajaraj
October-December 2001, 11(4):225-225
  2,013 0 -
Bhavin Jankharia
October-December 2001, 11(4):173-173
  1,664 0 -
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