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患有胃腫瘤的狗的存活率：良性與惡性結果

經過 TCMVET | 2024 年 9 月 9 日 | 狗癌症和腫瘤

Gastric tumors in dogs present a significant health challenge, with the prognosis depending largely on whether the tumor is benign or malignant. The survival rates for dogs with gastric tumors vary widely based on tumor type, treatment options, and the stage at diagnosis. This article explores the differences in survival outcomes between benign and malignant gastric tumors, and how early intervention and treatment can impact a dog’s prognosis.

Benign Gastric Tumors in Dogs

Benign gastric tumors, such as 平滑肌瘤, are non-cancerous growths that do not invade surrounding tissues or metastasize to other organs. These tumors are generally easier to treat and offer a favorable prognosis when surgically removed.

平滑肌瘤
Leiomyomas are the most common benign tumors in the stomach lining. They are slow-growing and typically cause fewer clinical symptoms compared to malignant tumors. When diagnosed early, surgical removal of leiomyomas can be curative. Most dogs recover fully, and the risk of recurrence is minimal.Survival Rate: Dogs with benign gastric tumors, like leiomyomas, typically have an excellent prognosis. With successful surgery, survival rates approach 100%, and most dogs live a normal lifespan without recurrence.
Adenomas and Polyps
Benign gastric adenomas and polyps are also relatively rare but treatable with surgery. Like leiomyomas, these tumors are non-invasive and have a good prognosis when detected early.Survival Rate: Following surgical removal, dogs with adenomas or polyps generally have excellent survival rates, and recurrence is uncommon.

Malignant Gastric Tumors in Dogs

Malignant gastric tumors, such as gastric adenocarcinoma 和 leiomyosarcoma, are far more aggressive and pose significant challenges to treatment. These tumors often invade surrounding tissues and metastasize to other organs, drastically lowering survival rates.

Gastric Adenocarcinoma
Gastric adenocarcinoma is the most common malignant gastric tumor in dogs. It is highly aggressive, often metastasizing to the liver, lungs, and lymph nodes by the time it is diagnosed. Surgical removal of adenocarcinoma is challenging due to its invasive nature, and recurrence is common even after surgery.Survival Rate: Dogs diagnosed with gastric adenocarcinoma typically have a poor prognosis. Even with surgery, the median survival time is only 2 to 6 months. Chemotherapy may help extend survival in some cases, but the overall prognosis remains guarded.
平滑肌肉瘤
Leiomyosarcoma, a cancer of the stomach’s smooth muscle, is less aggressive than adenocarcinoma but still carries a serious prognosis. These tumors can spread to other organs, but surgical removal may be effective if caught early.Survival Rate: The survival rate for dogs with leiomyosarcoma depends on early detection and successful surgical intervention. Dogs that undergo complete surgical removal may survive up to 12 months or longer. However, if the tumor has metastasized, survival times are significantly reduced.
淋巴瘤
Gastric lymphoma is a type of cancer that can affect the stomach lining and other organs. Unlike adenocarcinoma, lymphoma may respond to chemotherapy, offering more treatment options.Survival Rate: Dogs with gastric lymphoma may have a survival rate of 6 months to 1 year, depending on how well they respond to chemotherapy. While lymphoma is treatable, it is often not curable, and recurrence is common.

Factors Influencing Survival Rates

Several factors play a role in determining the survival rates for dogs with gastric tumors, whether benign or malignant:

早期發現
The earlier a tumor is detected, the more favorable the prognosis. Benign tumors identified early through routine check-ups are often curable with surgery. However, malignant tumors, especially those that metastasize, carry a much worse prognosis.
Tumor Location
Tumors located near the gastric outlet or pyloric region may cause obstruction, worsening the dog’s condition and complicating surgery. Tumor location can also affect the ease of surgical removal and the likelihood of recurrence.
Metastasis
Once a tumor metastasizes to other organs such as the liver, lymph nodes, or lungs, the prognosis becomes poor. Survival rates drop significantly for dogs with metastatic gastric cancer, as treatment options become limited.
治療方案
- 手術: Surgery is the best option for treating localized benign tumors and can significantly extend survival for dogs with malignant tumors, provided the cancer has not spread.
- 化療: Chemotherapy may help manage certain types of gastric cancer, like lymphoma, but it is often less effective for gastric adenocarcinoma or leiomyosarcoma. It may provide palliative care, improving quality of life and slightly extending survival times.

預後和生活品質

While benign tumors offer an excellent prognosis with surgical intervention, malignant gastric tumors have a much poorer outlook. Treatment is often focused on improving the dog’s quality of life, managing symptoms, and extending survival where possible. For dogs with advanced cancer, palliative care may be the best option, helping to reduce discomfort and maintain the dog’s comfort in their remaining months.

The survival rates for dogs with gastric tumors vary greatly depending on whether the tumor is benign or malignant. Benign tumors, such as leiomyomas, generally have an excellent prognosis with surgery, and dogs can live out a normal lifespan. In contrast, malignant tumors like adenocarcinomas and leiomyosarcomas carry a far worse prognosis, especially if metastasis has occurred. Early detection, surgical intervention, and, in some cases, chemotherapy can help improve survival outcomes, but the overall prognosis for malignant gastric tumors remains guarded.

解釋犬胃癌轉移超音波結果的挑戰

經過 TCMVET | 2024 年 9 月 9 日 | 狗癌症和腫瘤

超音波影像是獸醫腫瘤學的一個有價值的工具，特別是在評估狗的胃癌擴散（轉移）時。儘管有許多優點，但解釋犬胃癌轉移的超音波結果仍面臨一些挑戰。這些限制通常源自於難以區分惡性和良性異常，以及對影像主觀解釋的依賴。本文探討了獸醫在使用超音波評估犬胃癌轉移時面臨的挑戰以及如何克服這些障礙。

了解超音波在犬胃癌中的作用

超音波通常用於狗的胃癌診斷和分期，因為它可以提供胃和周圍器官的詳細即時影像。當談到轉移時，超音波有助於檢測以下區域的異常：

淋巴結
胃附近腫大的淋巴結可能表示癌症擴散，但它們也可能由於感染或發炎等反應性或良性原因而腫大。
肝臟和脾臟
胃癌的轉移通常會擴散到肝臟和脾臟。超音波可以檢測這些器官中的結節或腫塊，這可能表示有轉移性疾病。
其他腹部器官
也可以使用超音波檢查胰臟、腎臟和其他腹部結構是否有潛在的轉移跡象。

解釋超音波結果的挑戰

區分良性和惡性變化
解釋超音波結果的主要挑戰之一是區分惡性病變和良性病變。例如，在肝臟或脾臟中發現的結節可能是良性增生結節，而不是癌症轉移。同樣，淋巴結腫大可能是反應性增生或發炎的結果，不一定是轉移性擴散。單獨的超音波無法明確確認異常是否是惡性的，這通常需要進一步的診斷步驟，例如活檢或細針抽吸。
影像的主觀解釋
超音波檢查是一項高度依賴操作員的程序。進行超音波檢查的獸醫的技能和經驗會顯著影響解釋的準確性。設備、影像品質和解釋標準的變化也可能導致診斷轉移的不一致。超音波結果的這種主觀性質使得獸醫必須接受獸醫腫瘤學和診斷影像學方面的良好培訓。
小或早期轉移性病變的挑戰
早期轉移病灶可能太小而無法透過超音波檢測到。這些微小的異常可能不會引起器官外觀或質地的明顯變化，從而導致假陰性結果。對於容易發生早期和侵襲性轉移的癌症（例如狗的胃腺癌），這種限制尤其成問題。為了改善檢測，獸醫可以使用其他影像方式，如 CT 掃描或 MRI 以及超音波來進行更全面的評估。
解釋胃壁和胃層的變化
對於胃癌，超音波通常用於評估胃壁的厚度和完整性。雖然超音波可以檢測到胃壁厚度增加，但並不總是清楚這種增厚是否是由於腫瘤、發炎或其他良性疾病引起的。此外，腺癌等侵襲性腫瘤可能會破壞胃壁的分層外觀，但這些變化可能並不總是清晰可見，這使得解釋具有挑戰性。
超音波偽影和影像質量
偽影（超音波影像中的意外異常）可能會使結果的解釋變得複雜。由於患者移動、氣體幹擾或次優設備而導致的影像品質不佳可能會掩蓋關鍵細節，從而導致不準確的結論。例如，腸道中的氣體會阻擋超音波，從而難以看到附近的結構或腫塊。

應對超音波解釋的挑戰

獸醫採用多種策略來應對這些挑戰，並提高犬胃癌轉移病例中超音波解讀的準確性：

將超音波與其他診斷工具結合
為了克服超音波的局限性，它通常與其他診斷方法結合使用，例如 X 光、CT 掃描或內視鏡檢查。活檢或細針抽吸也可以明確診斷異常是惡性還是良性。
進行連續超音波檢查
系列超音波檢查或隨時間重複掃描可以幫助追蹤異常的進展。透過觀察病灶或腫塊的大小、形狀或位置的變化，獸醫可以對轉移的可能性做出更明智的決定。
使用多普勒超音波
測量血流量的多普勒超音波可以幫助區分良性和惡性病變。惡性腫瘤通常具有異常的血流模式，可以使用多普勒技術來檢測。這額外的資訊層提高了診斷的準確性。
專家培訓和第二意見
接受過超音波和獸醫腫瘤學高級培訓的獸醫能夠更好地準確解釋複雜的圖像。此外，尋求第二意見或諮詢獸醫診斷影像專家可以幫助澄清模糊的結果。

雖然超音波是評估犬胃癌轉移的重要工具，但解釋結果提出了一些挑戰。區分良性和惡性變化的困難、超音波解釋的主觀性質以及檢測小或早期病變的局限性都導致了這種診斷工具的複雜性。透過將超音波與其他診斷方法結合，使用多普勒超音波等先進技術並尋求專家意見，獸醫可以提高診斷和管理胃癌犬轉移的能力。

犬胃腫瘤的診斷影像：X 光和超音波應用

經過 TCMVET | 2024 年 9 月 9 日 | 狗癌症和腫瘤

早期準確的診斷對於犬胃腫瘤的有效治療至關重要。兩種最常用的診斷影像技術是 X 光（放射線照相）和超音波。這些工具可幫助獸醫觀察胃及周圍區域、識別異常情況並評估腫瘤生長的程度。在本文中，我們將探討 X 光和超音波在診斷犬胃腫瘤中的用途及其在確定治療策略中的意義。

胃腫瘤的 X 光成像

X 光影像，特別是與陽性造影劑結合時，通常是對疑似胃腫瘤的狗進行診斷評估的第一線。正對比 X 光使獸醫能夠觀察胃的結構並識別異常情況，例如：

填充缺陷
當胃的一部分沒有正確填充造影劑時，就會出現填充缺陷，表示存在阻礙正常流動的腫塊或病灶。這是胃腫瘤的常見症狀，包括腺癌、平滑肌肉瘤或平滑肌瘤等良性腫瘤。
胃出口阻塞
位於幽門區域附近的腫瘤可能會導致阻塞，阻止胃正常排空其內容物。 X 光可以顯示胃出口阻塞的跡象，例如擴張的胃充滿氣體或液體，這表明腫瘤的存在阻礙了從胃到腸道的流動。

雖然 X 射線提供了有關胃結構變化的寶貴信息，但它們可能無法提供有關腫瘤性質或階段的精確細節。為了進行更詳細的評估，獸醫經常求助於超音波成像。

超音波評估胃腫瘤

超音波是評估犬胃腫瘤的重要診斷工具。它提供即時成像，與 X 射線相比，可以更詳細地了解胃的內部結構。超音波對檢測胃壁的變化高度敏感，例如：

胃壁異常
超音波可以顯示胃壁增厚，這可能表示存在腫瘤。對於胃腺癌等浸潤性腫瘤，超音波可以檢測胃壁正常層的破壞。這有助於區分侵襲性和非侵襲性腫瘤，指導診斷和治療計劃。
腫瘤分期和轉移
超音波最有價值的用途之一是它在胃腫瘤分期中的作用。超音波可以識別腫大的淋巴結，表示癌症擴散。它還可以檢測到其他腹部器官的轉移，例如肝臟或脾臟，這在胃癌晚期很常見。

然而，僅超音波不能提供轉移的明確的組織病理學診斷。例如，肝臟或脾臟中的結節可能是良性的，而淋巴結腫大可能是由於反應性變化而不是癌症擴散引起的。因此，可能建議在超音波引導下細針抽吸或活檢進行進一步分析。

活檢和細針抽吸指南
超音波也是引導增厚的胃壁或可疑腫瘤進行活檢和細針抽吸的寶貴工具。然後可以檢查這些組織樣本，以確定腫瘤的類型，無論是惡性還是良性，並建立準確的診斷。

X 光和超音波成像的局限性

雖然 X 光和超音波都可以提供診斷胃腫瘤的重要訊息，但它們確實有局限性。 X 光可能會錯過較小的腫瘤或提供有關腫瘤特徵的有限細節。超音波雖然高度敏感，但取決於操作者，如果沒有額外的診斷測試（例如活檢或內視鏡評估），某些異常可能難以解釋。

X 光和超音波成像是診斷犬胃腫瘤的關鍵工具。 X 光通常用於檢測結構異常，例如充盈缺損或胃出口梗阻，而超音波可提供更詳細的胃壁變化成像，並有助於對腫瘤進行分期。總之，這些影像技術在犬胃癌的早期檢測和治療計畫中發揮著至關重要的作用。然而，為了明確診斷，通常需要進行活檢或細針抽吸等額外手術。

犬胃腺癌的轉移：發生率和受影響的區域

經過 TCMVET | 2024 年 9 月 9 日 | 狗癌症和腫瘤

Gastric adenocarcinoma is an aggressive and malignant form of stomach cancer commonly seen in older dogs, particularly in certain predisposed breeds. One of the most concerning aspects of this disease is its high metastatic potential. Studies show that metastasis occurs in approximately 74% of cases, making it one of the most difficult cancers to treat effectively. This article will explore the incidence of metastasis in canine gastric adenocarcinoma and identify the key areas commonly affected by cancer spread.

Incidence of Metastasis in Canine Gastric Adenocarcinoma

Gastric adenocarcinoma in dogs is known for its aggressive nature and rapid progression. Metastasis, or the spread of cancer from the original site to other parts of the body, is common. By the time most dogs are diagnosed, the cancer has already spread, which significantly complicates treatment and reduces survival rates.

The incidence of metastasis in dogs with gastric adenocarcinoma is alarmingly high, with studies reporting that up to 74% of cases will have cancer spread to other organs. This metastatic behavior highlights the importance of early detection, though symptoms are often vague and non-specific, making early diagnosis difficult.

Commonly Affected Areas by Metastasis

In cases of canine gastric adenocarcinoma, metastasis typically occurs in the following areas:

淋巴結
The lymphatic system is one of the first areas affected when gastric adenocarcinoma metastasizes. Cancer cells often spread to regional lymph nodes surrounding the stomach, which can then facilitate the spread of the disease to more distant areas of the body. Swollen lymph nodes, especially in the abdominal region, are a common sign that metastasis has occurred.
Liver
The liver is another organ frequently affected by metastasis from gastric adenocarcinoma. The liver’s proximity to the stomach and its role in filtering blood make it a prime target for cancer cells. Once the liver is affected, symptoms may include jaundice (yellowing of the skin and eyes), lethargy, and loss of appetite. The presence of metastasis in the liver is a significant indicator of advanced disease and a poor prognosis.
肺
Although less common than lymph node or liver metastasis, the lungs can also be affected by gastric adenocarcinoma. Lung metastasis may present as respiratory distress, coughing, or difficulty breathing. X-rays and imaging are typically used to detect lung metastasis, which further complicates treatment options.
Spleen and Peritoneum
The spleen and peritoneum (the lining of the abdominal cavity) are also vulnerable to metastasis. In advanced stages of the disease, cancer cells may spread to these areas, leading to abdominal swelling, pain, and general discomfort. Metastasis to these organs indicates an extensive spread of the disease, often requiring palliative care.

Symptoms of Metastatic Gastric Adenocarcinoma

The symptoms of metastatic gastric adenocarcinoma can vary depending on the organs affected. Common signs to watch for include:

Vomiting (often with blood)
食慾不振和體重減輕
嗜睡和虛弱
Difficulty breathing (in cases of lung metastasis)
Abdominal swelling or pain (if the peritoneum or spleen is affected)
Jaundice (in cases of liver metastasis)

These symptoms often overlap with other gastrointestinal issues, making it challenging to differentiate between benign conditions and aggressive cancer.

早期檢測的重要性

Due to the high incidence of metastasis in gastric adenocarcinoma, early detection is critical. Routine check-ups and diagnostic tools like ultrasound, X-rays, and biopsies can help identify the disease in its earlier stages, improving the chances of successful treatment. Once metastasis has occurred, treatment options become more limited, and the prognosis worsens significantly.

Metastasis in canine gastric adenocarcinoma is a common and serious complication, occurring in up to 74% of cases. The most commonly affected areas include the lymph nodes, liver, lungs, spleen, and peritoneum. Early detection is essential to improve treatment outcomes, but given the aggressive nature of this cancer, owners must be vigilant in monitoring for signs and seeking prompt veterinary care. Understanding the metastatic patterns of gastric adenocarcinoma can help veterinarians and pet owners take proactive steps to manage this challenging disease.