Clinical features and prognosis analysis of 31 cases of extramedullary plasmacytoma of the head and neck / 中华放射肿瘤学杂志

Objective:To investigate the clinical features, treatment options and prognostic factors of extramedullary plasmacytoma of the head and neck.Methods:Clinical data of 31 cases of extramedullary plasmacytoma of the head and neck treated in Eye Ear Nose and Throat Hospital of Fudan University from January 2005 to January 2020 were retrospectively analyzed. According to the involvement sites, the lesions were divided into the Waldeyer's ring involvement and non-involvement groups. The differences between two groups were compared by one-way ANOVA. The overall survival (OS) was analyzed by Kaplan-Meier method. The OS rate and local recurrence free survival (LRFS) rate between two groups were compared by log-rank test.Results:All 31 patients received radiotherapy. The median follow-up time was 98 months (7-192 months). Among them, 16 patients received radiotherapy and surgery, 10 patients received radiochemotherapy, and 2 patients received surgery and radiochemotherapy. Waldeyer's ring involvement was found in 15 patients, and Waldeyer's ring was not involved in 16 patients. The 10-year OS rate was 84.8%. Two cases showed local recurrence and 2 cases progressed to multiple myeloma. The 10-year OS rate in patients ≤55 years old was 100% vs. 67% in those >55 years old ( P=0.039). The 10-year OS rates in patients with and without Waldeyer's ring involvement were 93.3% vs. 75.2% ( P=0.031). The 10-year LRFS rate in patients with Waldeyer's ring involvement was 100% vs. 66.7% in those without Waldeyer's ring involvement ( P=0.022). The 10-year OS rate was 95% and 35.7% for patients with longest diameter of tumor ≤5 cm and >5 cm before radiotherapy, respectively ( P=0.02). Conclusions:Extramedullary plasmacytoma of the head and neck patients with longest diameter of tumor ≤5 cm obtain higher 10-year OS rate. Those with Waldeyer's ring involvement have better 10-year OS and LRFS rates.

Recent Research Progress of Extramedullary Plasmacytoma --Review / 中国实验血液学杂志

Extramedullary plasma cell tumor (EMP) is a kind of plasma cell tumor, and its pathogenesis is not completely clear. According to whether it is independent of myeloma disease, it can be divided into primary and secondary EMP, which have different biological and clinical characteristics. Primary EMP has low invasion, fewer cytogenetic and molecular genetic abnormalities and good prognosis, and surgery and / or radiotherapy are the mainly treatments. Secondary EMP, as the extramedullary invasive progression of multiple myeloma (MM), is often accompanied by high-risk cellular and molecular genetic abnormalities and poor prognosis, chemotherapy, immunotherapy and hematopoietic stem cell transplantation are the mainly treatment. This paper reviews the latest research progress of EMP in the pathogenesis, cytogenetics molecular genetics and treatment, so as to provide reference for clinical work.

Plasmocitoma extramedular solitario rinosinusal: reporte de caso y revisión de literatura / Solitary extramedullary plasmacytoma of the rhinosinusal cavity: a case report and literature review

Resumen El plasmocitoma extramedular solitario (PES) es una neooplasia maligna infrecuente caracterizada por una proliferación aislada de células plasmáticas monoclonales en tejido extramedular. La localización más frecuente es en cabeza y cuello con predominio en el territorio rinosinusal, sin embargo, estas lesiones malignas representan menos del 1% de los tumores de esta región anatómica. El diagnostico requiere una alta sospecha clínica, análisis histopatológico acucioso, estudios serológicos y exámenes radiológicos sistémicos de acuerdo a los criterios diagnósticos establecidos en la literatura internacional. Se analiza el caso de un paciente masculino con un PES que se presentó como un tumor de fosa nasal derecha y obstrucción nasal de meses de evolución con hallazgos clínicos e imagenológicos inespecíficos. El diagnóstico definitivo se realizó mediante biopsia endoscópica nasal y estudio histopatológico. El tratamiento fue abordado de manera multidisciplinaria entre otorrinolaringología, hematología y radiooncología. De acuerdo a las guías internacionales, se decidió realizar radioterapia localizada con buen resultado clínico precoz. El PES requiere un abordaje multidisciplinario para lograr un diagnóstico y tratamiento oportuno, siendo imprescindible la exclusión del mieloma múltiple debido a las diferencias terapéuticas y en pronóstico clínico. El tratamiento puede realizarse con radioterapia y/o cirugía, siendo la radioterapia el pilar de tratamiento.

Abstract Solitary extramedullary plasmacytoma (SEP) is a rare malignant neoplasm characterized by isolated proliferation of monoclonal plasma cells in extramedullary tissue. The most frequent location is in the head and neck with a predominance in the rhinosinusal territory; however, these malignant lesions represent less than 1% of the tumors in this anatomical region. The diagnosis requires a high clinical suspicion, careful histopathological analysis, serological studies and systemic radiological examinations according to the diagnostic criteria established in the international literature. We analyze the case of a male patient with SEP that presented as a tumor of the right nostril and nasal obstruction of months of evolution with nonspecific clinical and imaging findings. The definitive diagnosis was made by nasal endoscopic biopsy and histopathological study. The treatment was approached by multidisciplinary teamwork. According to international guidelines, it was decided to perform localized radiotherapy with good early clinical results. SEP requires a multidisciplinary approach to achieve a timely diagnosis and treatment, being essential exclusion of multiple myeloma due to the therapeutic differences and prognosis. Treatment can be done with radiation therapy and/or surgery; radiation therapy is the mainstay of treatment.

Plasmocitoma extramedular de canal auditivo externo: caso clínico / Extramedullary plasmacytoma of external auditory canal: a case report

Resumen El plasmocitoma extramedular es una neoplasia de células plasmáticas poco frecuente, que se ubica en 80% a 90% de los casos en la cabeza o cuello. Esta neoplasia representa menos del 1% de toda la patología maligna de cabeza y cuello. Dada la poca frecuencia de la patología y la escasez de casos publicados, esta entidad presenta una gran dificultad clínica y terapéutica. El diagnóstico se basa en el análisis histológico con inmunohistoquímica de la muestra obtenida, y el tratamiento varía según la ubicación, donde se puede realizar radioterapia o cirugía. En este artículo presentamos el caso de una paciente de 56 años, con antecedentes de otorrea de larga data en oído derecho, al examen físico presentaba un tumor que obstruía todo el conducto auditivo externo. Se realizó exéresis tumoral y la biopsia evidenció un plasmocitoma.

Abstract Extramedullary plasmacytoma is a rare plasma cell neoplasm, affecting 80% to 90% of the head or neck. This neoplasm represents less than 1% of all malignant head and neck pathology. Given the infrequency of the pathology and the scarcity of published cases, this entity presents great clinical and therapeutic difficulty. Diagnosis is based on histology and immunohistochemistry and treatment varies depending on the location, where radiation therapy or surgery can be performed. In this article, we present the case of a 56-year-old patient with a history of long-standing otorrhea in the right ear. Physical examination presented a tumor that obstructed the entire external auditory canal. Tumor excision was performed, and the biopsy revealed a plasmacytoma.

Plasmacytoma of the cervix / Philippine Journal of Obstetrics and Gynecology

@#Plasmacytoma is a rare disease entity that represents only 5%‒10% of all plasma cell neoplasms. It is rarely found in the female genital tract. There are 8 identified case reports on plasmacytoma of the cervix. The clinical symptoms are nonspecific and biopsy with immunohistochemistry is used to diagnose. Due to the paucity of cases, there is no standard treatment modality. We present a case of a 34-year-old patient who had a history of postcoital bleeding. Biopsy and immunohistochemistry were done which confirmed the diagnosis of plasmacytoma. Total abdominal hysterectomy, bilateral salpingectomy with transposition of ovaries was the chosen treatment option.

Plasmocitoma extramedular de laringe: a propósito de un caso / Extramedullary plasmacytoma of the larynx: a case report

Resumen Los plasmocitomas solitarios son una rara forma de presentación de neoplasias de células plasmáticas. Deben ser diferenciados del mieloma múltiple en el momento del diagnóstico y realizar un seguimiento estricto por el riesgo de transformación a mieloma. La localización de los mismos en la laringe es muy inusual, dado que sólo se han publicado 56 casos. Se presenta el caso de una paciente con un plasmocitoma extramedular de laringe que se trató mediante cirugía y radioterapia. Se revisan los criterios diagnósticos y los problemas terapéuticos.

Abstract Solitary plasmacytomas are a rare form of plasma cell neoplasms. They should be differentiated from multiple myeloma at the time of diagnosis and strictly monitored for the risk of transformation to myeloma. Their location in the larynx is very unusual, since only 56 cases have been published. We present the case of a patient with extramedullary plasmacytoma of the larynx that has been treated with surgery and radiotherapy. We reviewed the literature for diagnostic criteria and therapeutic problems.

Plasmocitoma de cuello uterino. Informe de un caso y revisión de la bibliografía / Plasmacytoma of uterine cervix. A case report and literature review

Resumen ANTECEDENTES: La incidencia de plasmocitoma extramedular es baja y su localización ginecológica es excepcional. Hasta la fecha se han reportado 27 casos de plasmocitomas ginecológicos (11 correspondientes a localización cervical). CASO CLÍNICO: Paciente de 37 años, sin antecedentes médicos de interés, que acudió a consulta por sangrado uterino anormal y postcoito. En la especuloscopia se apreció el cuello uterino hipertrófico y friable. Con la biopsia cervical se estableció el diagnóstico de plasmocitoma. Posteriormente, un estudio de extensión descartó la afectación en otras localizaciones. El tratamiento consistió en histerectomía y linfadenectomía pélvica, sin tratamiento coadyuvante. Los estudios de anatomía patológica e inmunohistoquímica confirmaron el diagnóstico. En la actualidad, la paciente se encuentra en seguimiento y libre de enfermedad. CONCLUSIONES: Debido a los pocos casos reportados de plasmocitoma cervical, no existe un tratamiento de referencia. A pesar de ello, no parece haber diferencias entre las pacientes tratadas con radioterapia o cirugía. La tasa de evolución a mieloma múltiple varía de 14 a 36%. La quimioterapia no disminuye la tasa de evolución a mieloma múltiple, por lo que está contraindicada.

Abstract BACKGROUND: The incidence of extramedullary plasmacytoma is low and, specifically, the gynecological location is exceptional. To date, 27 cases of gynecological plasmacytomas have been published (11 corresponding to cervical location). CLINICAL CASE: 37-year-old patient, with no relevant medical history, who came to a consultation for abnormal uterine bleeding and bleeding. By spectroscopy, the hypertrophic and friable cervix was appreciated. Cervical biopsy verifies the diagnosis of plasmacytoma. Subsequently, an extension study ruled out involvement in other locations. Treatment consists of hysterectomy and pelvic lymphadenectomy, without adjuvant chemotherapy. The pathological and immunohistochemical studies confirmed the diagnosis. Currently, the patient is in follow-up and free of disease. CONCLUSIONS: Due to the scarcity of published cases of cervical plasmacytoma, there is no reference treatment. Despite this, there do not appear to be any differences between the patients treated with radiotherapy or surgery. The rate of progression to multiple myeloma varies from 14-36%. The adjuvant therapy does not change the rate of progression to multiple myeloma, so it is contraindicated.

A Rare Incidence of Solitary Extramedullary Plasmacytoma of Nasal Cavity

Extramedullary plasmacytoma (EMP) is a rare neoplasm characterized by monoclonal proliferation of plasma cells. They originate in either bone – solitaryosseous plasmacytoma, or in soft tissue – EMP. EMP represents <1% of all head and neck malignancies. The nasal cavity and nasal septum are thecommon sites of occurrence. This is a report of EMP in a 47-year-old gentleman. He presented with a 3-month history of the left nasal blockage andepistaxis. Examination revealed a large reddish to blackish mass of the left nasal cavity. The first biopsy, however, showed benign sinonasal polyps. Biopsywas repeated in view of suspicious clinical and computed tomography features. Histopathology from the second biopsy reported as EMP, confirmed byimmunohistochemical techniques. The patient underwent bone marrow aspirate and trephine, skeletal survey, and laboratory investigations was performedto exclude multiple myeloma. Radiotherapy was initiated.

Multiple Solitary Plasmacytomas Presenting with Painful Erythematous Swelling of the Upper Eyelid

PURPOSE: To report a case of multiple solitary plasmacytomas that presented with painful erythematous swelling of the upper eyelid. The patient was diagnosed with extramedullary plasmacytoma, and was later found to have multiple metastases of the bone and soft tissue during follow up. CASE SUMMARY: A 55-year-old female patient presented with painful erythematous swelling of the left upper eyelid that persisted for 1 month prior to examination. Under suspicion of lacrimal gland inflammation, anti-inflammatory medication was started but the symptoms worsened. Orbital computed tomography showed that a mass infiltrated the left lacrimal gland. We performed incisional biopsy of the mass via eyelid crease incision. Based on histopathological examination, the mass was diagnosed as extramedullary plasmacytoma and the patient was treated with radiation. After a 10-month follow-up period, multiple metastases on the left parotid gland, thoracic spine, lumbar spine and pelvic bone were observed. Finally, we diagnosed the patient with multiple solitary plasmacytomas. CONCLUSIONS: We report the first case of multiple solitary plasmacytomas presenting with upper eyelid painful erythematous swelling. This condition should be considered for patients presenting with eyelid inflammation. In addition, long term follow up should be conducted to detect metastasis or recurrence.

Soft‑tissue amyloidoma with associated plasmacytoma.

Soft tissue amyloidoma with features similar to plasmacytoma, in absence of systemic amyloidosis, is an extremely rare finding. We hereby report the case of a 77 year old man who presented with a painless, nodular swelling on chest wall, diagnosed as soft tissue amyloidoma with plasma cell infiltration. Congo red staining was done to prove the presence of amyloid which showed characteristic “apple‑green” birefringence on polarized microscopy. The plasma cells were monoclonal in origin as demonstrated by serum protein and immunofixation electrophoresis. To the best of our knowledge, this is the second such reported case. However close follow up is required, as this patient may develop multiple myeloma in future.

Imaging features of solitary extramedullary plasmacytoma of liver / 中华消化外科杂志

Objective To summarize the imaging features of ultrasound, computed tomography (CT) and gadolinium-ethoxybenzyl-diethylenetriamine pentoacetic acid (Gd-EOB-DTPA) enhanced magnetic resonance imaging (MRI) of solitary extramedullary plasmacytoma (SEP) of liver, and investigate the key points of identification and diagnosis.Methods The clinical data of 1 patient with SEP of the liver who was admitted to the Southwest Hospital of the Third Military Medical University at 7 May, 2015 were retrospectively analyzed.The patient received contrast-enhanced ultrasound (CEUS) , plain and enhanced scan of CT and Gd-EOB-DTPA enhanced MRI.The patient underwent treatment after preoperative examinations.Pathological examination and immunohistochemical staining were done after operation.The patient was followed up by outpatient examination of color Doppler ultrasonography till 12 November, 2015.The location, size, shape, echo, density or signal, enhancement pattern, secondary performance were recorded by imageological examinations.Surgical treatment, results of pathological examination, immunohistochemical staining, postoperative recovery and recurrence of tumor were recorded.Results CEUS examination demonstrated a hypoechoic hepatic lesion at S7 segment of the right liver measuring 24 mm × 19 mm with clear boundary and dotted blood flow signal in the mass.In the arterial phase, the lesion was enhanced rapidly.Abdominal CT scan showed that the mass at the right liver lobe had slightly low density with clear boundary, the CT value of 34-64 HU, and liver capsule having no significant outer convex.On enhanced CT, the lesion presented a homogeneous enhancement and shape of posterior upper tributaries of right hepatic artery in the arterial phase, the lesion presented continuous enhancement which was slightly lower than that of liver parenchyma in the portal venous phase with the CT value of 77-102 HU, the lesion presented decreased enhancement with the CT value of 41-98 HU in the equilibrium phase.The maximum density projected image showed that the shape of an enlarged vascular image was found inside the lesion in the arterial phase and the lesion was adjacent to inferior vena cava and right hepatic vein which was compressed and displaced in the portal venous phase.On Gd-EOB-DTPA enhanced MRI, the right liver lobe showed a homogeneous T1-weighted and T2-weighted signal with clear boundary and without lipid component, hemorrhage or calcification.The lesion presented obvious enhancement in the arterial phase, homogeneous continuous enhancement which was slightly lower than that of liver parenchyma in the portal venous phase, decreased enhancement in the equilibrium phase.The lesion showed mild signal, adjacent to inferior vena cava and right hepatic vein which was compressed and displaced in the hepatobiliary phase.There was no obvious cirrhotic nodule in the liver.The patient received laparoscopic space-occupying lesion resection at the right liver lobe after finishing inspection.The grayish white lesion in hardness was seen, with clear boundary and capsule, adjacent to anterior wall of inferior vena cava and right hepatic vein in the operation.The results of pathological examination showed that the small tumor cells were scattered in bundle, nuclear were round or oval shape and eccentric with mitosis seen.The results of immunohistochemical staining showed that endothelium cell marker CD34, human multiple myeloma gene MUM1, vimentin, plasmacyte markers 38 and 138, expression of λ light chain protein were positive, the positive cell rate of proliferation activity marker Ki-67 was 10％.The results of blood routine test and blood biochemistry showed that the patient had no anemia, hypercalcemia, abnormal renal function or monoclonal immunoglobulin in the serum or urine.The results of postoperative bone marrow aspiration, immunoglobulin determination and whole body bone scan showed normal.Postoperative examinations confirmed the SEP of right liver.The patient recovered well and was discharged at postoperative day 9.Postoperative change at right liver lobe was detected by color Doppler ultrasonography at 1 month after operation.The patient was followed up for 6 months without tumor recurrence.Conclusion SEP of liver mainly locates at the right lobe of liver, and the imaging features include clear boundary, homogeneous echo, density or signal, adjacent capsule showing no significantly outer convex, surrounding vein demonstrating no violation and shifted by compression, enhancement pattern as fast-in and fast-out.

Mieloma múltiple con plasmocitoma extramedular cutáneo abscedado / Multiple myeloma with abscessed cutaneous extramedullary plasmacytoma

Se presentó un paciente con los diagnósticos de bronconeumonía bacteriana extrahospitalaria y anemia para estudio. Se describen la evolución clínica, los estudios imagenológicos, de laboratorio e histológicos que permitieron diagnosticar la presencia de un mieloma múltiple con plasmocitoma extramedular cutáneo abscedado.

A patient with a diagnosis of community-acquired bacterial bronchopneumonia and anemia was presented for study. We describe his clinical course, the imaging, laboratory and histological studies are described. They allowed diagnose the presence of multiple myeloma with abscessed cutaneous extramedullary plasmacytoma.

Primary pulmonary plasmacytoma: A case report and review of the literature / 第二军医大学学报

Objective To describe the characteristics of primary pulmonary plasmacytoma. Methods One patient with primary pulmonary plasmacytoma was described and relevant literatures were reviewed. Results Primary pulmonary plasmacotyma is a very rare form of extramedullary plasmacytoma.Patients with this disease usually have little symptoms. Primary pulmonary plasmacytoma often presents as solitary or multiple nodular mass lesions, but these lesions lack specific radiographic features and are easily lead to misdiagnosis. The diagnosis of primary pulmonary plasmacotyma is based on the histological confirmation of plasma cell infiltration in lung lesions. Additionally, it requires normal bone marrow, normal skeletal survey, no related organ or tissue impairment, and no M protein in serum and/or urine. Most cases of solitary pulmonary plasmacytoma can be treated with surgical resection and/or irradiation, and combination chemotherapy is effective for cases of diffuse pulmonary infiltration. Conculsion Biopsy and pathologic diagnosis is very important to patients who present as solitary or multiple nodular mass lesions to avoid misdiagnosis and mistreatment.

Extramedullary relapse of multiple myeloma presenting as massive upper gastrointestinal bleeding: a rare complication

No abstract available.

Prognostic factors in solitary plasmacytoma / 中国肿瘤临床

Objective:To investigate the clinical features, treatment strategies, and relative prognostic factors in 66 patients with solitary plasmacytoma (SP). Methods:The data of 644 patients, who were diagnosed with pathologically proven plasmacytoma in Tianjin Medical University Cancer Institute and Hospital between June 2000 and October 2012, were collected. Sixty-six of these patients (10.25%) were evaluated as SP, including 45 solitary bone plasmacytoma (SBP) and 21 extramedullary plasmacytoma (EMP). Results:SBP and EMP were the two clinical subsets of SP revealing the location of the lesion. SBP mostly occurred in the axial skeleton, whereas EMP was most frequently observed in the upper respiratory tract. The differences among tumor size, serum M-protein, and serumβ2-microglobulin exhibited statistical significance. Conclusion:Large tumor size (≥5 cm), positive serum M-protein, and serumβ2-microglobulin were the factors that affected the prognosis of SBP patients. Radiotherapy and serumβ2-microglobulin>3.5 mg/L were the favorable prognostic factors for EMP patients.

A Case of Extramedullary Plasmacytoma in the Lacrimal Excretory System

PURPOSE: To report a case of extramedullary plasmacytoma in the lacrimal excretory system. CASE SUMMARY: A 56-year-old female patient suffering from chronic epiphora for 1 year and having a non-tender, fixed palpable mass in the medial canthus of the eyelid visited the outpatient clinic. Orbital CT showed the non-enhancing mass was located along the right lacrimal sac and nasolacrimal duct and protruded into the nasal cavity. Biopsy was performed at the Otolaryngology Department. Based on histopathological examination, the mass was diagnosed as extramedullary plasmacytoma and the patient was treated with a total dose of 4500 cGy radiation (25 times in 1 month). After the 28-month follow-up period, the mass was not observed on Sinus CT and there was no recurrence. Additionally, no specific lesion was found during nasal endoscopy. CONCLUSIONS: We report a case of extramedullary plasmacytoma in the lacrimal excretory system successfully treated by radiation therapy.

Clinical analysis and treatment of 14 multiple myeloma patients with extramedullary plasmacytoma / 中国肿瘤临床

Objective: This study aimed to investigate the clinical characteristics, treatment options, and prognosis of multiple myeloma (MM) patients complicated with extramedullary plasmacytoma (EMP). Methods:The case of MM concurrent with EMP are rare. During the period between June 2005 and June 2013, clinical experience, diagnosis, and treatment of MM with EMP cases were retrospectively analyzed. Results:Fourteen cases were diagnosed with MM complicated with EMP in the Third Hospital of Peking Uni-versity, Beijing, China. Among these 14 cases, seven were males and seven were females. The mean age of patients was 56.9 years (ranging from 40 to 80 years old). Nine of the cases were diagnosed with EMP during the preliminary diagnosis, and the remaining five cases developed EMP during the course of treatment. Among the 14 cases, six were solitary EMPs and eight were multiple EMPs. Among the multiple EMP cases, five died, one showed disease progression, and two demonstrated partial regression. Conclusion:The prognosis of MM complicated with EMP is poor. Thus, new treatment strategies should be further explored.

The clinicopathological study of 18 solitary plasmacytoma patients / 中国医师进修杂志

Objective To investigate the diagnosis,differential diagnosis,treatment and prognosis of solitary plasmacytoma (SP) and summarize its clinical features for pathological and clinical application.Methods Reviewed the data of 18 patients diagnosed with SP from January 2005 to August 2013.The clinical features,diagnosis,treatment and prognosis were analyzed retrospectively.Results All 18 cases were pathologically confirmed with SP and met the diagnostic criteria of SP.In 18 patients,12 patients were male and 6 patients were female.Four cases of lesion were located at lumbar,each 2 cases of lesion were located at mandible and ribs,each 1 case of lesion was located at sacrum and occipital bone,3 cases of lesion were located at nasal cavity and maxillary sinus,2 cases of lesion was located at pars nasalis pharyngis,each 1 case of lesion was located at parotid,parasternal and peritoneal cavity.All patients were followed up for 54 months,2 patients were died,3 patients were local recurrence,2 patients were transformed to multiple myeloma,others were survival with no tumor.Conclusions As early as possible to diagnose is the key to treat SP.The final diagnosis of SP is based on the histopathological findings and the optimal treatment for patients with SP is surgery combined with moderate dose radiotherapy.

Extramedullary Plasmacytoma of the Pancreas Diagnosed Using Endoscopic Ultrasonography-Guided Fine Needle Aspiration

Extramedullary plasmacytoma involves organs outside the bone marrow; however, involvement of the pancreas is rare. We recently experienced a case of extramedullary plasmacytoma of the pancreas that was diagnosed by endoscopic ultrasonography-guided fine needle aspiration (EUS-FNA). EUS-FNA, which has a high diagnostic accuracy and an excellent safety profile, is the modality of choice for establishing tissue diagnosis. We report a case of extramedullary plasmacytoma of the pancreas diagnosed using EUS-FNA.

Solitary Extramedullary Plasmacytoma in the Gastrointestinal Tract: Report of Two Cases and Review of Literature / 대한소화기학회지

Solitary extramedullary plasmacytoma (EMP) is a plasma cell neoplasm without bone marrow involvement. EMPs are rare in the gastrointestinal (GI) tract. We report two cases of primary EMP, one in the transverse colon and the other in the stomach. In the first case, a mass on the transverse colon was found on colonoscopy. The patient underwent left hemicolectomy and has been followed-up for 3 years without recurrence postoperatively. The latter case had several masses in the stomach. The patient underwent bypass surgery and has received supportive care for 1 month. Histopathologic specimens of both the cases showed a monoclonal lambda chain EMP. Subsequent investigations included a bone marrow biopsy, serum IgA, IgG, IgM and serum protein electrophoresis, and the results were negative for multiple myeloma in both the cases. Solitary EMP in the GI tract can be mistaken for colon cancer or stomach cancer on endoscopy; therefore, a sufficient number of biopsy specimens can help diagnose solitary EMPs. Surgical resection alone or with radiation therapy in cases with positive surgical margin is currently the only treatment for solitary EMP in the GI tract. Further study is necessary to determine disease prognosis and to investigate other treatment methods.