Diagnostic Radiology and Nuclear Medicine Imaging in Hodgkin s Disease

Transcription

1 March 2001 Diagnostic Radiology and Nuclear Medicine Imaging in Hodgkin s Disease Brett Cox, Harvard Medical School, Year III

2 Agenda Introduction to radiological regions of the mediastinum. Differential diagnosis of an anterior mediastinal mass. Brief review of Hodgkin s disease. Radiological imaging for Hodgkin s disease. Menu of tests Diagnostic potential and limitations of tests Role in treatment monitoring and follow-up Introduction to gallium scanning 2

3 Patient Clinical History A previously healthy 26-year-old white male was referred to the BIDMC infectious disease department for evaluation of: Anorexia with weight loss of 173 to 148 pounds over 8 months Occasional headaches Nonproductive cough Prolonged unexplained fevers to Worsening drenching night sweats Entire infectious disease work-up was negative. 3

4 Chest P A and Lateral BIDMC Done as part of the FUO work-up and revealed: A right mediastinal opacity. Obliteration of the retrosternal clear space. BIDMC 4

5 Areas of the Mediastinum Anterior: Bounded by the clavicles, diaphragm, sternum, and the pericardium and trachea. Middle: Between the anterior and posterior mediastinum. Includes the heart, great vessels, and pulmonary roots. A M P Posterior: Bounded by the thoracic inlet, diaphragm, vertebral bodies/paravertebral gutters, and the pericardium. Novelline, RA. Squire s Fundamentals of Radiology. Cambridge, Harvard University Press,

6 Regions of the Anterior Mediastinum I Region I Region II Region III III II Novelline, RA. Squire s Fundamentals of Radiology. Cambridge, Harvard University Press,

7 Differential Diagnosis: Adult Anterior Mediastinal Mass Region I Retrosternal goiter Tortuous innominate artery Lymph nodes Thymic tumors Ascending aortic aneurysms Region II Germ cell neoplasms Thymic tumors Sternal tumors (usually mets) Novelline, RA. Squire s Fundamentals of Radiology. Cambridge, Harvard University Press, Region III Pericardiac fat pad Diaphragmatic hump Morgagni hernia Pericardial cysts II III I 7

8 Definitive Diagnosis A Chamberlain procedure (mediastinotomy) was performed. Multiple biopsies of the large anterior mediastinal mass were taken. Histology and flow cytometry revealed Hodgkin s Disease, nodular sclerosing type. 8

9 Hodgkin s Disease 7500 new cases per year. 20% of all lymphomas. Mean age of diagnosis is 32. Arises in a single node and spreads characteristically to anatomically contiguous nodes. 9

10 Hodgkin s Disease Often associated with distinctive B symptoms : Unexplained fevers > 38 o C. Drenching night sweats in past month. Weight loss >10% over 6 months. Histology: Reed-Sternberg cell admixed with a variable inflammatory infiltrate. Cotran RS, Kumar V, Robbins SL. Pathologic Basis of Disease. Philadelphia, W.B. Saunders Company,

11 Imaging in Hodgkin s Disease Staging is of utmost clinical importance because therapy, prognosis, and clinical course are all intimately related to the distribution of disease. Diagnostic radiology and nuclear medicine play a pivotal role in: Initial staging. Intra-treatment surveillance. Post-treatment surveillance. 11

12 Hodgkin s Disease Staging Ann Arbor Classification Mauch PM, Armitage JO, Diehl V, Hoppe RT, Weiss JM (ed). Hodgkin s Disease. Philadelphia, Lippincott Williams & Wilkins,

13 Radiographic work-up in initial staging Mandatory radiological work-up includes: Chest PA/lateral CT of thorax CT of abdomen and pelvis ( replaces Bipedal lymphangiogram) 13

14 CT Scan Done with IV contrast, early phase imaging, 1 cm slices. Detects intrathoracic disease not detected on CXR in 20% of patients. Between 10-60% of patients have management change post-ct. Sensitivity of abdominal node detection equal to bipedal lymphangiography and is noninvasive and gives added information. 14

15 Characteristics CT findings: General rule: nodes >1 cm are concerning. Often see Asymmetric, anterior mediastinal soft tissue mass. Pleural effusions in 30% of cases (lymphatic/venous obstruction). Benign pericardial effusions common. 15

16 Out Patient: Chest CT Large, well circumscribed anterior mediastinal mass. BIDMC 16

17 Out Patient: Chest CT Small pericardial effusion. Small right pleural effusion. 17 BIDMC

18 Radiographic work-up in initial staging optional tests Liver and spleen ultrasonography If clinical suspicion for involvement. Specificity & sensitivity similar to CT or MRI. Technetium bone scanning If bony pain, questionable lesions on other studies. MRI If suspected occult liver, spleen, thymus, bone marrow lesions. Specificity & sensitivity similar to CT for liver or spleen involvement. Gallium scanning Useful in differentiating scarring from active mediastinal lymphoma. 18

19 Gallium radionuclide tumor imaging Main indication: Staging of lymphomas, assessment of their response to therapy, and relapse detection. Technique: 67 Ga-citrate administered I.V. Acquire delayed images. SPECT = rotation of a photon detector array around the body to acquire data from multiple angles. Determines position and concentration of radionuclide distribution. Imaging Mechanism Rough surrogate marker for tumor metabolic activity. Increased permeability of tumor vessels Large extracellular fluid space Tumor up-regulation of iron-binding proteins such as ferritin 19

20 Gallium radionuclide tumor Contraindications: None. imaging Radiopharmaceutical: 67 Ga-Gallium citrate 8-10 mci, γ emitter. Half-life = 78 hours. Binds to transferrin (in plasma), lactoferrin (in tissue), and ferritin. Equipment: Gamma camera w/ whole body and tomographic abilities, medium or high energy collimator, imaging computer. Patient Preparation: Bowel regimen may be given after injection to clear activity. 20

21 Images: Gallium radionuclide tumor imaging Acquired at 48 and 72 hours. Sensitivity for detecting HD is about 85%, specificity of 90%. Sensitivity for mediastinal disease is 95%, specificity of 90%. Aftercare: None. Complications: None. Cost: The cost of SPECT imaging is around $

22 Gallium radionuclide tumor imaging Normal gallium activity: Renal cortex: First 24 hours. Liver: Greatest uptake of gallium. Spleen. Bone marrow & blood pool: behavior as an iron analog. Skeleton: Incorporated into the Cahydroxyapatite crystal as a Ca 2+ analog. Children: physeal and thymic activity. Glands: Nasopharynx, salivary & lacrimal. Bowel: 1 o colonic activity on delayed images. Breasts & breast milk. External genitalia. BIDMC 22

23 Our Patient: SPECT Imaging Large area of intense tracer accumulation in anterior mediastinum. Consistent with history of mediastinal lymphoma. 23 BIDMC

24 Patient Treatment Chemotherapy: 5 cycles of ABVD Radiation therapy: Modified mantle 24

25 Radiographic intra-treatment surveillance Repeat studies with detectable lesions at presentation. Determines therapeutic response, therapy modification. Follow: Tumor volume decrease. New lesions. Therapy-induced lesions. 25

26 Brett Cox Our Patient: Chest P A and Lateral BIDMC BIDMC Large right mediastinal mass has resolved. 26

27 Brett Cox Frontal CXR Comparison BIDMC Pre-treatment BIDMC Intra-treatment 27

28 Lateral CXR Comparison Pre-treatment BIDMC Intra-treatment BIDMC 28

29 Our Patient: Chest CT Homogeneous soft tissue mass in the anterior mediastinum 3.6 x 2.4 cm BIDMC 29

30 Chest CT Comparison Pre-treatment BIDMC Intra-treatment BIDMC 30

31 Radiographic intra-treatment surveillance Residual fibrotic mass often visible on CXR and CT. Further investigations determine nature of residual abnormality. Gallium imaging after 3 cycles of chemotherapy is an excellent prognostic indicator of clinical outcome. A complete response is achieved in 70% of patients. Longer disease free survival. Lower mortality. 31

32 Our Patient: SPECT Imaging No abnormally gallium-avid region in the anterior mediastinum. BIDMC 32

33 SPECT Comparison Pre-treatment BIDMC Intra-treatment BIDMC 33

34 Radiographic post-treatment surveillance Repeat investigations that were abnormal at presentation. 25% of relapses occur at new sites. Regression of disease may be slow. Residual fibrotic mass may still be visible on chest radiograph and CT. Further investigations may be necessary to define nature of residual abnormality, can also follow over time. 34

35 References Castellino RA Diagnostic imaging studies in patients with newly diagnosed Hodgkin's disease. Annals of Oncology. 3 Suppl 4:45-7. Chapman S, Nakielny R. Aids to Radiological Differential Diagnosis, 3 rd edition. Philadelphia, W.B. Saunders Company, 1995, Chapman S, Nakielny R. A Guide to Radiological Procedures. Philadelphia, W.B. Saunders Company, 1993, Cotran RS, Kumar V, Robbins SL. Pathologic Basis of Disease. Philadelphia, W.B. Saunders Company, 1994, Front D, Israel O The role of Ga-67 scintigraphy in evaluating the results of therapy of lymphoma patients. Seminars in Nuclear Medicine. 25(1): Kramer EL, Sanger JJ (ed). Clinical SPECT imaging. New York, Raven Press, 1995, 7-38, , Mauch PM, Armitage JO, Diehl V, Hoppe RT, Weiss JM (ed). Hodgkin s Disease. Philadelphia, Lippincott Williams & Wilkins, 1999, McLaughlin AF, Magee MA, Greenough R, Allman KC, Southee AE, Meikle SR, Hutton BF, Joshua DE, Bautovich GJ, Morris JG Current role of gallium scanning in the management of lymphoma. European Journal of Nuclear Medicine. 16(8-10): Novelline, RA. Squire s Fundamentals of Radiology. Cambridge, Harvard University Press,

36 The End! 36

37 Acknowledgements Beverlee Turner for her support and PowerPoint expertise Larry Barbaras and Ben Crandall our Web Masters 37