SPECT/CT Imaging of the Sentinel Lymph Node

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1 IAEA Regional Training Course on Hybrid Imaging SPECT/CT Imaging of the Sentinel Lymph Node Giuliano Mariani Regional Center of Nuclear Medicine, University of Pisa Medical School, Pisa, Italy Vilnius, August 27 31, 2012

2 (in press)

3 The Sentinel Lymph Node Concept in Oncologic Surgery Lymphatic dissemination of solid tumors generally occurs in a sequential fashion. Tumor status of regional lymph nodes is the most important single prognostic factor for a variety of solid tumors. Clinical evaluation and preoperative imaging are generally ineffective in ascertaining tumor status of regional lymph nodes in patients with early cancers. In traditional oncologic surgery, tumor status of a certain lymphatic basin is assessed by complete lymph node dissection and histologic analysis of all resected lymph nodes.

4 The Sentinel Lymph Node Concept in Oncologic Surgery Complete lymph node dissection is burdened with a high rate of short- and long-term complcations. In the majority of patients with early cancers the lymphatic basin of interest is free from metastasis, therefore complete lymph node dissection turns out to be have been performed unnecessarily. Histologic analysis of all resected lymph nodes (up to 20 per basin) is a time-consuming procedure involving a non-negligible risk of underestimating metastatic involvement (only 2-3 sections evaluated per lymph node).

5 The Sentinel Lymph Node Concept in Oncologic Surgery According to orderly progression of lymphatic metastasis, if the first lymph node encountered by lymph draining from the tumor (the sentinel lymph node) is free from metastasis, then it is highly unlikely that subsequent nodes along the same pathway contain metastasis. Therefore, complete lymph node dissection can be replaced by the less aggressive selective resection of the sentinel lymph node(s) only. Concentrating detailed histologic analysis on few lymph nodes increases the chance of detecting metastasis, even as isolated tumor cells.

6 The Sentinel Lymph Node Concept in Oncologic Surgery A certain rate of false-negative results occur in sentinel lymph node biopsy False-negative results are defined as the presence of metastasis in non-sentinel lymph nodes when the sentinel node does not contain metastasis. The above definition implies complete lymph node dissection at the time of primary surgery. Alternatively, false-negative results are defined as the appearance of metastasis during follow-up in a lymphatic basin that had been classified as negative on the basis of sentinel lymph node biopsy.

7 The Sentinel Lymph Node Concept in Oncologic Surgery Despite a certain rate of false-negative results, sentinel lymph node biopsy has proven to be a safe and accurate method of lymphatic staging, mainly in patients with early breast cancer or with melanoma. The most recent TNM classification includes specific notation for sentinel lymph node status. Sentinel lymph node biopsy is now the accepted standard of care for patients with early breast cancer or with melanoma. All other applications are to be considered part of clinical investigation protocols.

8 Intents of Sentinel Lymph Node Biopsy For some tumors (such as breast cancer) sentinel lymph node biopsy is performed with purely stagingprognostic purposes. When metastasis is found in the sentinel lymph node, completion lymphadenectomy of the lymphatic basin is performed primarily for more accurate staging. Whereas, for other tumors (such as melanoma) completion lymphadenectomy after finding a metastatic sentinel lymph node is performed with therapeutic purposes, as it increases the chance of achieving better local control of the disease.

9 Radioguided Sentinel Lymph Node Biopsy Radioguidance is the most accurate method for performing sentinel lymph node biopsy (combined or not with visual blue-dye guidance). Lymphoscintigraphy with a radiocolloid agent injected interstitially at the site of the primary tumor is an integral component of radioguided sentinel lymph node biopsy. Uptake of the radiocolloid reflects a physiologic function of lymph nodes and in no way indicates the presence of metastatic tumor cells. The presence of metastasis in sentinel node(s) is ascertained by histologic analysis (H&E staining, immunohistochemistry, molecular analysis).

10 Radioguided Sentinel Lymph Node Biopsy Intra-operative counting with the hand-held gamma probe is the ultimate guidance for sentinel lymph node biopsy. Nevertheless, preoperative lymphoscintigraphy is crucial for correctly addressing the surgeon to the most likely location of sentinel lymph node(s). This is especially important for patterns of lymphatic drainage outside the expected basins, or for sentinel nodes in unusual locations. Dynamic acquisition is more important for some tumors (such as melanoma) rather than for other tumors (such as breast cancer).

11 OE Nieweg, 2012

12 OE Nieweg, 2012

13 OE Nieweg, 2012

14 OE Nieweg, 2012

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16 Less Appropriate Definitions of the Sentinel Lymph Node Lymph node closest to the primary lesion. First lymph node depicted on the lymphoscintigraphy images. Lymph node with the highest count rate. Any radioactive lymph node. Lymph node with a count rate that is a certain factor higher than the background or compared to nonsentinel nodes. Lymph node with a count rate that exceeds a certain fraction of the hottest node. Blue lymph node.

17 Modalities for Localizing Anatomically the Sentinel Node on Lymphoscintigraphy Planar imaging without reference landmarks. Planar imaging with contour of the body by moving a radioactive point source. Planar imaging with transmission scan from a flood source beneath the patient s body. SPECT. SPECT/CT.

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27 Breast Cancer

28 Breast Cancer

29 Breast Cancer

30 Breast Cancer

31 Breast Cancer

32 Breast Cancer

33 Melanoma

34 Melanoma

35 Melanoma

36 Melanoma

37 Melanoma in head and neck

38 Melanoma in head and neck

39 Penile cancer

40 Penile cancer

41 Penile cancer

42 Head and neck cancer

43 Head and neck cancer

44 Head and neck cancer

45 Head and neck cancer

46 Cervical cancer

47 Endometrial cancer

48 Vulvar cancer

49 Prostate cancer

50 Prostate cancer

51 Testicular cancer

52 Testicular cancer

53 Renal cancer

54 General Indications for SPECT/CT in Sentinel Lymph Node Biopsy In cases without visualization or with poor visualization at planar imaging. Due to the correction for tissue attenuation, SPECT/CT is usually more sensitive than planar imaging, and may be particularly useful in obese patients. Localization of SLNs in areas with complex anatomy and a high number of lymph nodes, such as the head and neck, or in cases with unexpected lymphatic drainage (e.g., between the pectoral muscles, internal mammary chain, level II or III of the axilla, or in the vicinity of the scapula) at planar imaging. Anatomical localization and detection of additional SLNs in areas of deep lymphatic drainage such as the pelvis, abdomen, or mediastinum.

55 Freehand SPECT imaging technology used in CSS300 during surgery Data with tracked non-imaging probe Non-uniform / non-symmetric set <180 covered Center depends on scan < 40 thousand events

56 Accessories of CSS300 Gamma probe with sterile tracking target Sterile patient target

57 Spatial localization system of CSS Handle (can be covered to be used sterile) 2. Optical camera 3. Infrared localization system 4. Non-sterile Handle 4

58 CSS300 for freehand SPECT Imaging & Navigation by SurgicEye s CSS300 freehand SPECT imaging and navigation device Gamma Detection using conventional gamma probe

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