Logan Steele
Focal thickening is a condition that can occur in various parts of the body, including the small bowel, large bowel, lungs, and muscles. In the context of muscle focal thickening, one example is focal cortical thickening, which can occur in the lateral aspect of the proximal femoral shaft, leading to an increased risk of atypical femoral fractures, especially in patients on long-term bisphosphonate treatment for osteoporosis. Another example is focal thickening of the left ventricle, which can be associated with false tendons (FTs) in cats and may be mistaken for hypertrophic cardiomyopathy. Focal thickening can also refer to the thickening of specific areas of the bowel wall, which may be caused by neoplastic, inflammatory, infectious, or ischemic conditions. This can be assessed through imaging techniques such as computed tomography (CT) and multidetector computed tomography (MDCT) scans.
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What You'll Learn
Focal thickening in cats
Another area where focal thickening can occur in cats is the left ventricle of the heart. False tendons (FTs) are string-like structures that can lead to focal thickening in the insertion region of the left ventricle. This thickening can be mistaken for focal hypertrophic cardiomyopathy, so it is important to perform echocardiographic examinations to compare wall thickness at the FT insertion region with a normal region without FTs.
Renal subcapsular thickening is another type of focal thickening observed in cats, often related to lymphoma or feline infectious peritonitis. Ultrasound examinations can detect this thickening, which can be either focal or circumferential, and is typically observed in the kidneys.
Additionally, focal thickening in the gastrointestinal tract of cats can be indicative of neoplasia, particularly when accompanied by partial or complete loss of layering. In some cases, severe inflammation can also lead to a loss of layering, although this is less common.
Furthermore, focal thickening of the muscularis layer in the intestine can be caused by alimentary lymphoma or an intestinal foreign body, resulting in smooth muscle hypertrophy. Mast cell tumours and histoplasmosis have also been associated with selective thickening of the muscularis layer.
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Focal thickening in the femur
In the case of AFFs, focal thickening occurs along the lateral cortex of the proximal femur, specifically in the subtrochanteric region. This thickening can be detected through radiographic imaging and is considered a warning sign for an impending complete atypical femoral fracture. The thickening may appear as a small focal beak-like structure and can be indicative of underlying microfractures.
The lateral cortical thickening in AFFs is characterised by increased bone mineral density (BMD) and bone heterogeneity in the subtrochanteric femur. Quantitative CT (QCT) scans have been employed to compare bone mineral density and bone quality between long-term bisphosphonate users who sustained an AFF and those who did not. Results revealed that individuals who experienced AFFs exhibited a thicker lateral cortex and higher bone heterogeneity within the lateral cortex before the fracture occurred.
While the relationship between cortical thickness and atypical femur fractures remains uncertain, several studies have suggested a potential link between thicker cortices and an increased risk of subtrochanteric and diaphyseal (S/D) femur fractures. However, other studies have found no evidence that thicker femoral cortices increase the risk of such fractures. The inconsistencies in findings highlight the need for further research and a more comprehensive understanding of the nature, extent, and bilaterality of cortical thickness in future case reports.
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Focal pleural thickening
Pleural thickening is a condition where scar tissue builds up and expands the thin membrane (the pleura) covering the lungs. It is treatable but not curable, and while it is not always serious, it may indicate a more severe underlying condition such as malignant mesothelioma cancer.
The diagnosis of focal pleural thickening may be challenging and can have medico-legal implications. To distinguish between focal and diffuse pleural thickening, doctors examine the location and shape of the thickening, along with associated findings. Imaging scans play a crucial role in diagnosis. The analysis of the outer surfaces of the lungs, including the pleural layers, visceral pleura, parietal pleurae, and extrapleural fat, helps in recognizing the nature of the thickening.
The treatment for focal pleural thickening focuses on managing symptoms and protecting lung function. Doctors closely monitor patients to catch any early signs of cancer or more severe lung problems. While focal pleural thickening is generally less serious than diffuse thickening, early care and intervention are crucial to prevent potential lung function impairment.
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False tendons
FTs can produce focal thickening at their insertion region in the left ventricle, which may be mistaken for focal hypertrophic cardiomyopathy. This thickening is simply due to the presence of the FT insertion, rather than disproportionate growth in this segment over time. However, excessive FTs and singular large FTs in cats have been linked to heart failure and cardiac malfunction.
Echocardiographic assessment of feline FTs is important as it can help identify potential issues with the left ventricle. This involves using two-dimensional echocardiography to measure the interventricular septum at end-diastole in regions with and without FT insertions. Caution is required when using this method, as the presence of FTs near the interventricular septum can result in inaccurate measurements.
Sonography is another imaging technique that can be used to assess tendon abnormalities. It is particularly useful for evaluating focal tendinopathy or tenosynovitis, as it can define adjacent entities that contribute to impingement. Tendon thickening can be an early sign of tendinopathy, and sonography can detect changes in the normal contour and echotexture.
Overall, false tendons are structural features that can lead to focal thickening in the left ventricle, which must be carefully assessed to distinguish between healthy and abnormal conditions.
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Hypertrophic cardiomyopathy
HCM is typically inherited in an autosomal dominant pattern, which means that a child of a parent with HCM has a 50% chance of inheriting the disease-causing mutation. The diagnosis of HCM involves a combination of medical history, family history, physical examination, and diagnostic tests such as echocardiography, cardiac catheterization, cardiac MRI, ECG, and genetic testing. Treatment options include medications such as beta-blockers, verapamil, or disopyramide, as well as lifestyle changes such as staying active, eating healthily, maintaining a normal weight, getting good quality sleep, and avoiding smoking. Mavacamten is a specific medication used to treat the obstructive form of HCM.
There are two types of HCM: obstructive and non-obstructive. In obstructive HCM, the thickened heart muscle blocks or reduces blood flow from the left ventricle to the aorta. This type of HCM accounts for about two-thirds of cases. Non-obstructive HCM, on the other hand, is characterised by thickened heart muscle that does not block blood flow out of the heart. It is important to note that some people with HCM may not experience any symptoms, while others may only exhibit symptoms during exercise or exertion.
The diagnosis and treatment of HCM are typically managed by a cardiologist or paediatric cardiologist, and in some cases, patients may be referred to a cardiomyopathy centre with specialised training. While HCM can occur at any age, most people receive a diagnosis in middle age. It is estimated that about 1 in every 500 young people in the United States have HCM, but a large percentage of these cases remain undiagnosed.
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