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We are reporting on a case of lymphadenopathy after surgery for rectal cancer. The case was a 66‒year‒old female. Laparoscopic high anterior resection(D3 dissection)was performed for rectal cancer(pT1bpN0M0, pStage Ⅰ)in April 2018, and she was followed up with on an outpatient basis. In July of the same year, a painless mass had formed in the right groin. An abdominal contrast‒enhanced CT showed lymph node swelling around the right groin and external iliac artery, but the tumor markers, CEA 2.3 ng/mL and CA19‒9 less then 2 U/mL, were within the standard values. An inguinal lymph node biopsy was performed during the same month. Pathological examination revealed no cancer cells and formation of epithelioid granuloma with giant cells. There was no suspicion of systemic sarcoidosis based on the test results and clinical findings. From the above, the patient was diagnosed with sarcoid reaction due to the tumor. Abdominal contrast‒enhanced CT scan 2 months after the biopsy showed lymph node shrinkage and there was no recurrence 2 years after the biopsy.We present a case of advanced gastric cancer with paraaortic lymph node metastasis successfully treated by conversion therapy. The patient was a 71‒year‒old male. Because of paraaortic lymph node metastasis, we initiated intensive chemotherapy with S‒1, oxaliplatin, and trastuzumab. After 6 courses, CT examination revealed that the size of the primary tumor decreased, suggesting a complete response(CR). Furthermore, the metastatic lymph nodes decreased in both number and size, suggesting a partial response(PR). We continued chemotherapy, changing to S‒1 and trastuzumab only because of Grade 3 neutropenia, and conducted continuous infusion chemotherapy. After 5 courses, we performed an upper gastrointestinal endoscopy. The primary tumor recurred, suggesting a progressive disease(PD), while metastasis to the paraaortic lymph nodes disappeared. We decided that a curative resection was possible and performed distal gastrectomy with D2 and paraaortic lymph node dissection. The postoperative courses were uneventful, and the patient was discharged from the hospital 12 days postoperation. The patient is well without any recurrence of cancer at 1 year 3 months postoperation. Conversion therapy may offer the possibility of prolonged survival for patients with gastric cancer previously considered unresectable.A 68‒year‒old man was referred to our hospital due to vomiting and light‒headedness. The patient was diagnosed with advanced gastric cancer. Neoadjuvant chemotherapy(S‒1 plus oxaliplatin)was initiated resulting in a partial response(PR) after 5 courses. Total gastrectomy and D1 dissection was performed. The tumor was diagnosed as poorly differentiated adenocarcinoma and the pathological Stage was ypT3, N3b, M1[CY1], ypStage Ⅳ. Ramucirumab plus nab‒paclitaxel was administered due to the appearance of swollen lymph nodes post‒operatively. click here This treatment maintained PR for 6 courses. However, after an evaluation of progressive disease(PD), nivolumab was initiated as third‒line chemotherapy. After 3 courses, a sudden seizure occurred and a brain metastasis with a diameter of 6 mm was observed. Considering the decrease in CEA level and that the brain metastasis presented as a small lesion, the tumor was inferred to be highly sensitive to nivolumab. We continued nivolumab monotherapy as chemotherapy. Radiotherapy was not performed. Both intra and extra‒cranial metastatic lesions maintained PR for 17 courses. The treatment was changed to irinotecan after evidence of PD was observed. However, after 2 courses(2 years and 3 months from his first visit), the patient died of an unknown cause. To our knowledge, this is the first case of brain metastasis of gastric cancer successfully treated with nivolumab.Here, we report a case of severe thrombocytopenia induced by nivolumab. A 70‒year‒old woman with advanced gastric cancer was treated with nivolumab. After the first dose, she noticed an erythematous rash. During the second cycle, fever and purpura on the lower extremities were also noted. Laboratory examinations revealed severe thrombocytopenia of grade 4, mild hemolytic anemia, leukopenia, and coagulopathy. Immune‒related adverse events(irAE)were suspected, and we started 40 mg(0.7 mg/kg)prednisolone(PSL)per day. Her symptoms and laboratory data immediately improved. However, when we reduced the dose of PSL, she developed rash and thrombocytopenia again. We increased the dose of PSL to 40 mg, which was effective for improving these abnormalities. We then gradually reduced the PSL, paying attention to avoid a relapse of irAEs. We could not restart chemotherapy thereafter, and she died from progression of gastric cancer. As shown in this case, PSL is effective for immune‒related thrombocytopenia; however, determining how to reduce the dose of PSL and when to restart chemotherapy requires careful consideration.Intramedullary spinal cord metastasis(ISCM)is rare. However, with advances in diagnostic imaging, the incidence of ISCM is increasing. We herein present a case of breast cancer metastasis in the lower thoracic spinal intramedullary area in a patient who was then successfully treated with emergency radiotherapy. A 56‒year‒old woman with breast cancer was admitted to our hospital due to rapidly progressing weakness in both legs and bladder and rectal disturbance. Spinal MRI revealed a gadolinium‒enhancing intramedullary lesion. The patient was treated with emergency radiotherapy and oral steroids. Although the prognosis of ISCM is extremely poor, emergency radiotherapy could be an effective treatment for ISCM to improve the patient's quality of life(QOL).An 83‒year‒old woman received trastuzumab plus anastrozole as first‒line chemotherapy for inflammatory breast cancer in her left breast. Following the treatment, the induration and redness in her breast gradually improved; however, 2 days after receiving the 5th course of chemotherapy, she developed dyspnea and was referred to the emergency room. Her SpO2 was 88%; her KL‒6 level had increased to 2,613 U/mL; and a chest CT scan showed ground‒glass opacity in the bilateral lung fields, yielding a diagnosis of interstitial pneumonia requiring steroid pulse therapy. The dyspnea improved immediately after steroid administration, and the patient was discharged 20 days after hospitalization. Thereafter, the steroid dosage was gradually lowered to 5 mg/day. We discontinued steroid therapy after a chest CT confirmed the reduction of ground‒glass opacity. However, she was later readmitted for interstitial pneumonia for which she was readministered steroid pulse therapy. Trastuzumab‒induced interstitial pneumonia is rare, but we must be aware of the possibility that patients may develop severe pulmonary disorders or experience cardiotoxic effects.