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June 2007 Tumor Unknown Conference
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Case 1 C.G. - 21 year old male with a history of curretage and bone grafting of a distal ulnar lesion eighteen months ago
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Aneurysmal Bone Cyst (ABC) Osteolytic, hyperplastic, hyperemic-hemorrhagic lesion of unknown origin Epidemiology 80% before 20 years of age, rare after 30 years old Most common sites: long bones LE > UE 30% secondary lesions due to pre-existing tumor Radiographs Eccentric, expansile, lytic lesion of metaphysis Cortical attenuation or destruction Rim of reactive bone Fluid-Fluid levels on MRI are characteristic
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ABC Histology Cavernous spaces filled with blood, lacking endothelial lining Fibroblastic cells, multinucleated giant cells and thin strands of bone
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ABC Treatment Excision, curettage, and bone grafting Resection in case of an expendable bone. Other modalities include adjuvant cryo, chemical cautery, injection of steroids Radiation not recommended Prognosis Local recurrence rate approx 10%, increased if open physis
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Case 2 T.K. - 18 year old male with asymptomatic left ankle swelling for several months
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Aneurysmal Bone Cyst (ABC) Osteolytic, hyperplastic, hyperemic-hemorrhagic lesion of unknown origin Epidemiology 80% before 20 years of age, rare after 30 years old Most common sites: long bones LE > UE 30% secondary lesions due to pre-existing tumor Radiographs Eccentric, expansile, lytic lesion of metaphysis Cortical attenuation or destruction Rim of reactive bone Fluid-Fluid levels on MRI are characteristic
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ABC Histology Cavernous spaces filled with blood, lacking endothelial lining Fibroblastic cells, multinucleated giant cells and thin strands of bone
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ABC Treatment Excision, curettage, and bone grafting Resection in case of an expendable bone Other modalities include adjuvant cryo, chemical cautery, injection of steroids Radiation not recommended Prognosis Local recurrence rate approx 10%, increased if open physis
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Case 3 S.P. - 12 year old male with left hip pain after a minor fall
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Unicameral Bone Cyst Benign fluid filled cystic lesion of bone of unknown cause Epidemiology 5-15 years of age Male > Female Proximal humerus most common, followed by proximal femur
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Unicameral Bone Cyst Symptoms Asymptomatic unless fracture occurs Radiographs Central lytic lesion of metaphysis Attenuation and slight expansion of cortex Fluid filled on CT/MRI
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Histology Thin fibrous membrane lining cyst Few macrophages, giant cells, leukocytes and slivers of bone and osteoid Unicameral Bone Cyst
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Treatment Cysts become inactive at skeletal maturity and typically resolve without surgical intervention Multiple treatments including curettage and bone grafting, steroid injections have been tried with variable efficacy Fractures tend to lead to resolution of cyst Displaced fractures are the only absolute surgical indication Unicameral Bone Cyst
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Case 4 A.M. - 87 year old female with an asymptomatic posterior thigh soft tissue mass present for many years, the patient reports that it has increased in size over the past three months
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Lipoma Benign tumor of mature fat Classification Superficial: (more common) contained within subcutis prevalence for back, neck, proximal limbs Deep: (less common) within muscle or intermuscular spaces Age Most frequent between 40-60 years old Presentation Slow growing asymptomatic mass
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Lipoma Imaging Resembles normal fat on all CT and MRI images Histology Mature fat cells (lipocytes) Rarely small areas of hemmorrage, necrosis, calcification Absence of lipoblasts and pleomorphic, hyperchromatic nuclei differentiate lipoma from liposarcoma Treatment Marginal Excision Local recurrence is rare
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Primary malignant tumor arising from fat 15% of all soft tissue tumors Usually presents at 40-60 years of age Two main types Myxoid: usually low grade Stage I lesion Cytogenic marker: reciprocal translocation on chromosome 12 Pleomorphic: usually high grade Stage II lesion Liposarcoma
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Can be very large at presentation due to anatomic location and deep-seated, slow-growing nature Also typically not painful or tender MRI Similar to other soft tissue sarcomas, with multilobular configuration T1) Low intensity T2) Bright signal Liposarcoma
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Myxoid Histology Sheets of lipocytes or lipoblasts interspersed in myxo- matous amorphous matrix with low cell to matrix ratio Fine branching capillaries with arborization pattern, resemble a road map Pleomorphic Histology More cellular Lacks plexiform capillary network May have large, bizarre lipoblasts with abundant eosinophilic cytoplasm Liposarcoma
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Treatment Preoperative adjuvant radiation therapy Wide surgical excision Treatment Wide local excision Radiotherapy may be used to control local recurrence and lessen the risk of metastasis Prognosis Five year survival: well differentiated 85-100%, myxoid 75-95%, round cell and pleomorphic 20-50%, dedifferentiated 30% Local recurrence 10% with adequate margins Liposarcoma
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Case 5 T.S. - 44 year old male with six month history of an anterior shoulder mass
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Pleomorphic Sarcoma Malignant soft tissue tumor of mesechymal origin Epidemiology 7000 new cases of soft tissue sarcomas diagnosed yearly Lesions classified according to direction of differentiation Can be caused by radiation exposure
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Pleomorphic Sarcoma Symptoms Enlarging mass, most are large, deep and firm at diagnosis Can be painless or painful Radiographs MRI is the best imaging modality
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Pleomorphic Sarcoma Histology Dedifferentiated mesenchymal cells Grade of tumors determined on histology Treatment Radiation therapy Wide surgical excision, limb salvage if possible Prognosis depends on Tumor Grade Size (> 5 cm) Location superficial or deep to fascia
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Case 6 D.E. - 15 year old male with left knee pain after falling from a skateboard three weeks ago
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Chondroblastoma Benign tumor composed of chondroblasts Epidemiology Male: female is 3:1 10-20 years of age Localization Epiphysis, apophysis, or short bone Extension to metaphysis and even through physeal plate. Proximal humerus>distal femur>proximal tibia>proximal femur
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Clinical Presentation Pain, usually referred to a joint Moderate to long duration Imaging XR: Osteolytic with smooth boarders, eccentric CT/MRI: Well defined boarders, fuzzy mottled intratumoral radio densities Chondroblastoma
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Gross Rubbery soft with sharp limits toward the surrounding bone Pink to gray to tan in color Whitish foci or chalky granules (calcifications) Histo Highly cellular: Chondroblasts and Giant cells Pathognomonic: calcium in fine granules deposited on a reticular network producing a “chicken-wire” pattern Chondroblastoma
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DDX Giant Cell Tumor, Clear Cell Chondrosarcoma, Chondroma, Chronic Brodie’s abscess Treatment Stage 1, 2, and some stage 3: intralesional excision after frozen confirmation Stage 3: wide intra or extraarticular segmental resection Prognosis Local recurrence < 10% after curettage in stage 3 tumors, rare after wide resection Chondroblastoma
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Case 7 T.L. - 49 year old male with left elbow pain and swelling after a fall
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Osteomyelitis Bone Infection Acute hematogenous, subacute focal disease, and chronic types Epidemiology Most common in infants and children Declining incidence due to better dx/tx Staph aureus most common in all age groups
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Osteomyelitis Symptoms Pain, decreased ROM, swelling, erythema, fever, malaise, irritability Radiographs Delayed changes on imaging (2-4 weeks) Lytic lesion with mottled appearance usually in metaphysis Periosteal elevation/reaction
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Osteomyelitis Histology Mixed cell population Sequestrum: dead cortical bone Involucrum: new cortical bone Treatment Biopsy/culture Acute IV antibiotics ± surgical debridement Chronic IV antibiotics with surgical debridement
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Case 8 K.M. - 13 year old female with a painful soft tissue mass of the left anterior knee
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Epithelioid Granulomatous Inflammation Chronic inflammation A compact collection of cells of the mononuclear phagocyte system Types Low Turnover: Foreign body High Turnover: Epithelioid, hypersensitivity Treatment Marginal excision
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Case 9 N.S. - 19 year old male with a chest wall mass discovered on an x-ray for suspected bronchitis
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Calcifying Fibrous Tumor of Pleura Very rare benign fibrous tumor of pleura Composed of hyalinised collagen with psam- momatous calcification and inflammatory infiltrate Rare cases reported in the literature are in patients less than 30 years old Imaging shows circumscribed lesion with increased density centrally which represents areas of calcification Treatment is typically excisional biopsy to rule out sarcoma
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Case 10 A.Z. - 70 year old female with left distal thigh pain and swelling for several weeks
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B-Cell Lymphoma Neoplasm of B-Lymphocytes Most common Non-Hodgkin lymphoma Fourth through seventh decades Primary lymph node disease Extranodal sites More than 50% of patients will have extranodal involvement at diagnosis Primary bone lymphomas are rare (5% of extranodal disease) Most common site is the thigh
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Large B Cell Lymphoma of Soft Tissue Symptoms Often mild and prolonged before diagnosis Radiographs Lytic lesion with “moth eaten” appearance Histology Dense sheets of round cells CD-20 positive
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Large B Cell Lymphoma of Soft Tissue Treatment Combined chemotherapy and radiation to bony sites Chemo: Cytoxan, adriamycin, vincristine, and prednisone If remission is obtained by 6 cycles of chemo, cure rates approximate 60-70%
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