MD of the meniscus can appear in one of two pathological forms: stromal MD and cystic parameniscal degeneration. This can occur with turning, twisting, or pivoting activities or sports. hX_o8*z{H@h>K"v)[b'.=((g0"B HD#g(=gD[='=\`?f8 8Ps"#%B8;"ap9*3@"3Br@fMS GdDVOKPou%P/FDKIuTDLnjb>/ :[br#7A( ceROe"uZU,E;6]MOki:h-- ?F4Qm6ndKclD;33*ZkzxR5|,; Aipcm.Zx0abuC{&=\N)A\&/Gt'4Oja|Dyp^EsG?^GsrrG&.yhKx_ . 2020 Jul;39(3):281-287. doi: 10.14366/usg.19064. An incomplete meniscal incision may lead to a repeat. Epub 2022 Sep 2. By far, the most common location for a tear is in the back and on the inner or medial side of the knee that is the area we call the posterior horn of the medial Ont Health Technol Assess Ser. Pain is getting worse day by day and due to this i m now less active and my weight is going high. That occurred because of degenerative changes within the meniscus. Necrotic tissue, nerve sheath tissue, and pus would all be able to look like cysts on T2-weighted MRIs. Before Please enable it to take advantage of the complete set of features! Uncomplicated meniscectomy: 4 to 6 weeks. This site needs JavaScript to work properly. Arthroscopy. Value of different MR pulse sequences. Meniscus Matrix Structural and Biomechanical Evaluation: Age-Dependent Properties in a Swine Model. Meniscal degeneration can occur together with degeneration of the patella, known as chondromalacia patellae. [Comparison of the Arthroscopic Finding in the Knee Joint and the MRI - Retrospective Study]. F!>78d/7`#?d|n06A ,?4X)nX.n 1R@0igvtnc1/@ )>& 4 endstream endobj 79 0 obj <> endobj 80 0 obj <> endobj 81 0 obj <>stream 25(5):834-40, 2018, Tsujii A et al: Age-related changes in the knee meniscus. Clin Orthop Relat Res. Short description: Other meniscus derangements, unsp medial meniscus, unsp knee The 2023 edition of ICD-10-CM M23.305 became effective on October 1, 2022. WebDeveloped by renowned radiologists in each specialty, STATdx provides comprehensive decision support you can rely on - Meniscus Degeneration. Although meniscus cyst does not cure, they may become symptomless over time, especially with activity limitation. A [Arthroscopic Finding of Knee Joint in Relation to Age and Its Comparison with Pre-Operative Clinical Finding - a Retrospective Study]. WebMucoid degeneration, knee pain. Ventura M, Seabra P, Oliveira J, Sousa P, Quesado M, Sousa H, Pereira R, Costa A, Carvalho P. Cureus. Degenerative meniscal lesions are seen as primary degenerative meniscal lesions and meniscal lesions in osteoarthritic knees. ADVERTISEMENT: Supporters see fewer/no ads. By closing this message, you are consenting to our use of cookies. There are no confirmed means by which cysts can specifically be prevented but the following are observed to be helpful. Cited by lists all citing articles based on Crossref citations.Articles with the Crossref icon will open in a new tab. At Premier Pain Centers, we offer top quality pain management using some of the least invasive, most effective pain procedures possible. Trial of clinical treatment to observe patients pain reaction. What is a degenerative meniscus tear? A meniscal cyst is a mixture of joint fluid produced by a tear within the meniscus tendon and the joint pad over the knee. eCollection 2022 Oct-Dec. Front Bioeng Biotechnol. If surgery is performed to find the meniscus and relax the cyst, the patient may be able to return to action as early as three weeks post-operatively. 50(4):306-13, 2006, Sproule JA et al: Altered signal intensity in the posterior horn of the medial meniscus: an MR finding of questionable significance. Parameniscal cyst with a related tear that cannot repair (e.g., complex, degenerative, radial tear patterns). An official website of the United States government. It should be normal in younger patients with a severe meniscal injury or cyst. When meniscus tears happen from age, they are called degenerative meniscus tears. This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional. Suppose you have regained motion and strength. Improvement was sustained in 32 of 60 patients (53%) at follow-up. M23.305 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The cyst of the medial meniscus is usually present on the posterior side of the posterior horn. This was sustained at follow-up in 10 patients (56%). Degenerative Changes of the Menisci of the Knee. Signal intensity alteration in the substance of the lateral meniscus. AJR Am J Roentgenol. Nothing on this site should be taken as medical advice for any individual case or situation. Patients underwent intra-articular knee steroid/bupivacaine injection and were followed clinically for a minimum of 6 months. A torn meniscus mainly occurred severe pain in the knee. Before Acta Radiol. 19(2):222-9, 2011, Zarins ZA et al: Cartilage and meniscus assessment using T1rho and T2 measurements in healthy subjects and patients with osteoarthritis. Case study, Radiopaedia.org (Accessed on 05 Mar 2023) https://doi.org/10.53347/rID-11047. Comparative Morphological and Morphometric Study between Medial and Lateral Menisci in Aged Male and Female Human Cadavers. Mucoid degeneration of the meniscus refers to a change in the molecular make up of the meniscus as a nonspecific response to injury particularly in a young Stoller D, Stoller MC, Stoller CJ, Stoller KL, Stoller MJ, Stoller. 2022 Aug;15(4):231-243. doi: 10.1007/s12178-022-09759-2. It may or may not be associated 2002 Jul-Aug;18(6):569-77. doi: 10.1053/jars.2002.29897. Radial tears of the posterior horn of the medial meniscus. If the cyst has no symptoms, there is no reason one cannot take part in activities. The frequency of these cysts is a matter of controversy. Time takes a meniscus cyst to recover without surgery: Meniscus tears are the most often treated knee harm. 7(3):287-91, 2002, Cothran RL Jr et al: MR imaging of meniscal contusion in the knee. Thirteen of 18 patients (72%) who had an isolated degenerative tear of the posterior horn of the medial meniscus recorded a complete resolution of symptoms. These last two types of sequences should not be used alone in the description of meniscal degeneration. 48(8):1469-78, 2015, Takahashi K et al: Medial meniscal posterior root/horn radial tears correlate with cartilage degeneration detected by T1 relaxation mapping. Arthroscopy. myxomatous degeneration mucous degeneration. The https:// ensures that you are connecting to the 2005;5(12):1-37. 84(6):1098-104, 2015, Wang L et al: T1rho MRI at 3T of menisci in patients with acute anterior cruciate ligament (ACL) injury. Maintaining good fitness and conditioning can control injury to the exposed knee. We use cookies to improve your website experience. Knee Surg Sports Traumatol Arthrosc. 163(1):149-54, 1994, Raunest J et al: Magnetic resonance imaging (MRI) and arthroscopy in the detection of meniscal degenerations: correlation of arthroscopy and MRI with histology findings. 2016 Dec 30;10:797-804. doi: 10.2174/1874325001610010797. Acta Radiologica: Vol. It can cause pain and to a meniscal tear. Webmucoid degeneration degeneration with deposit of myelin and lecithin in the cells. WebThe meniscus is a tendon pack that works as a shock absorber, provides stress transmission, absorbs lubrication, and provides nutrition to the knee. Forty-nine of 60 patients (82%) reported an improvement in symptoms following guided intra-articular knee steroid/bupivacaine injection (complete: 25 patients (42%), partial: 24 (40%) patients). Meniscal Injuries in Patients Aged 40 Years or Older: A Comparative Study Between Meniscal Repair and Partial Meniscectomy. Knee. Materials and methods: Vermesan D, Prejbeanu R, Laitin S, Damian G, Deleanu B, Abbinante A, Flace P, Cagiano R. Eur Rev Med Pharmacol Sci. Often just removing it to decompress (shrink) and vanish without other treatment. WebE P, Mucoid degeneration of meniscus. People who have no pain with a torn meniscus can walk, stand, sit, and sleep easily. For more information, please visit our Permissions help page. 24(2):152-7, 2012, Lee DH et al: Predictors of degenerative medial meniscus extrusion: radial component and knee osteoarthritis. Increased meniscal MR signal attributable to meniscal degeneration is a common finding. Given the regularity of meniscus tears, related cysts are uncommon. There are some causes, including: Particularly when standing on the affected leg. Unable to process the form. Osteoarthritis Cartilage. When there is chemical change of the tissue itself, it is true degeneration; when the change consists in the deposit of abnormal matter in the tissues, it is infiltration. Keywords: government site. We believe that meniscal mucoid degeneration with tear is not uncommon. During arthroscopy, the torn meniscus is surgically removed. 2022 Oct 10;10:957435. doi: 10.3389/fbioe.2022.957435. Webto establish an accurate diagnosis of mucoid degeneration [24, 8, 11]. They are mostly uncommon occurrences that cause pain and disability in the knee. 5(5):597-602, 2014, van Tiel J et al: Delayed gadolinium-enhanced MRI of the meniscus (dGEMRIM) in patients with knee osteoarthritis: relation with meniscal degeneration on conventional MRI, reproducibility, and correlation with dGEMRIC. u61Z Mucoid degeneration,: like degenerative arthritis of a joint, generally occurs as a results of aging. This condition should not be related to a bakers cyst. WebConclusion: Intra-articular steroid/bupivacaine knee joint injection reduced pain symptoms in the majority of patients (81.7%) with degenerative tears of the posterior horn of the medial meniscus, usually with a sustained response. Management of traumatic meniscal tear and degenerative meniscal lesions. Patients with clear mechanical symptoms and meniscal pathology may benefit from arthroscopic partial meniscectomy, but surgery is not a guaranteed success, especially with concomitant articular pathology. I am doing exercise for quadriceps and vmo but yet found no improvement. Supplement. Specify as the first choice of treatment for small Parameniscal cysts. Abstract. 2022 Oct 1;480(10):1866-1873. doi: 10.1097/CORR.0000000000002381. 34(4):404-7, 1993, Kaplan PA et al: MR of the knee: the significance of high signal in the meniscus that does not clearly extend to the surface. https://medical-dictionary.thefreedictionary.com/myxoid+degeneration. It takes place when synovial fluid becomes enclosed, often secondary to a meniscal tear. Epub 2005 Sep 1. Meniscal degeneration is a process that often occurs due to gradual wear and is commonly associated with advanced knee osteoarthritis. The lateral meniscus is present with the anterior/anterolateral side of the anterior horn or the body. Recovery time for about 6 to 8 weeks if your meniscus tear is treated without surgery. Epub 2016 Oct 19. J Biomech. Drive if the injured leg is to be used for gas and brake or clutch. An incomplete surgical process may lead to repetition. HSS J. Nakase J, Yoshimizu R, Kimura M, Kanayama T, Yanatori Y, Tsuchiya H. Knee. Mucoid degeneration (MD) of meniscus means degeneration with deposit of myelin and lecithin in the cells. Australas Radiol. WebBackground: Tendinopathy, enthesopathy, labral degeneration, and pathologic conditions of the articular disc (knee meniscus and ulnocarpal) are sometimes described in terms of inflammation or damage, while the histopathologic findings are The pain mostly is harmful during twisting or bending movements. Epub 2020 Mar 1. 22(11):883-90, 1987. 2004 Apr;20(4):373-8. doi: 10.1016/j.arthro.2004.01.004. The PubMed wordmark and PubMed logo are registered trademarks of the U.S. Department of Health and Human Services (HHS). Osteoarthritis Cartilage. 78 0 obj <> endobj 102 0 obj <>/Filter/FlateDecode/ID[]/Index[78 72]/Info 77 0 R/Length 116/Prev 313959/Root 79 0 R/Size 150/Type/XRef/W[1 3 1]>>stream World J Orthop. M23.305 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. 1. Treatment for a torn meniscus often begins conservatively, depending on the type, size and location of your tear. Arthroscopic debridement compared to intra-articular steroids in treating degenerative medial meniscal tears. An official website of the United States government. Our patient presented with pain on extension and had flexion deformity of 5 degree and further flexion was full and pain-free. Diagnosis is usually shown by inspection and palpation of a different mass present over a medial or lateral joint line. The site is secure. Arthroscopy; Degenerative joint disease; Meniscal tear; Meniscus; Osteoarthritis. Preprocedural MRI appearances correlate with response to injection. 35(1):103-12, 2007, Jones AO et al: Medial meniscus posterior root attachment injury and degeneration: MRI findings. Poor results in older degenerative meniscal tears with related cysts. FOIA Materials and Methods Baseline demographic, clinical, radiographic, and Magnetic 125(4):267-71, 2005, Boya H et al: Clinical and arthroscopic features of meniscal tears and a search for the role of infection in histologically confirmed meniscal mucoid degeneration. PMC The cyst may be removed surgically at that time by making an opening over it and cutting it off. 8(1):13-4, 2012, Joseph GB et al: Baseline mean and heterogeneity of MR cartilage T2 are associated with morphologic degeneration of cartilage, meniscus, and bone marrow over 3 years--data from the Osteoarthritis Initiative. Federal government websites often end in .gov or .mil. Meniscal mucoid degeneration is a condition that has generally been ignored; it is likely to be responsible for primary meniscal degeneration. A differential diagnosis was given for this lesion, which included myxoma, myxoid lipoma, MRI is useful in preoperative diagnosis of, Dictionary, Encyclopedia and Thesaurus - The Free Dictionary, the webmaster's page for free fun content, PREVALENCE OF PARTIAL THICKNESS ROTATOR CUFF TEAR IN YOUNGER POPULATION (20-40 YEARS)--A CADAVERIC STUDY, A Rare Cause of a Fluctuating Cystic Lesion in the External Auditory Canal, Aortic valve involvement in a patient with granulomatosis with polyangiitis, Traumatic pulmonary valve hematoma; an unusual complication of pulmonary balloon valvuloplasty/Pulmoner balon valvuloplastinin nadir komplikasyonu; travmatik pulmoner kapak hematomu, Cloacal fibrosarcoma in a canary (Serinus canaria), Pattern of cardiovascular and pulmonary lesions seen in an autopsy series of sudden and unexpected deaths, Adductor tendinopathy in a hockey player with persistent groin pain: a case report, A huge broad ligament fibroid with degenerative changes: a rare case report, Spindle Cell Lipoma of the Parotid: Fine-Needle Aspiration and Histologic Findings, Mucoid degeneration of the anterior cruciate ligament: a case report. Anatomical description and short-term follow up clinical results for ultrasound-guided injection of medial collateral ligament bursa: New conservative treatment option for symptomatic degenerative medial meniscus tear. Epub 2017 Sep 2. The role of different MR sequences in the analysis of the extent and distribution of meniscal degeneration in middle-aged and elderly patients has not been thoroughly evaluated. Bookshelf In the end, the torn meniscus has locked the knee. AJR Am J Roentgenol. This information is not intended to create, and receipt or viewing does not constitute, a doctor-patient relationship. To request a reprint or corporate permissions for this article, please click on the relevant link below: Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content? {"url":"/signup-modal-props.json?lang=gb"}, E P, Mucoid degeneration of meniscus. doi: 10.1177/19476035211037390. Meniscus repair surgery: right away, but only with a brace. This case shows a grade 3 MR signal intensity of the posterior horn. It can also occur while bending the knee deeply. This site needs JavaScript to work properly. Bethesda, MD 20894, Web Policies hbbd```b``n}`RDGH`Y&0&` !j7d YF`[dAG)|./UwA"@J0 endstream endobj startxref 0 %%EOF 149 0 obj <>stream Accessibility Careers. Arthroscopy. What is myxoid degeneration of meniscus? It is the most sensitive symptomatic test for meniscal injury or tenderness. 4, pp. May be efficient in a population with degenerative tears. doi: 10.7759/cureus.33270. Degenerative tears occur because as we age, or because of our genetics our tissues simply wear out over time. Asked for Female, 27 Years I had early stage mucoid degeneration in my left knee and pain in both the knees since more than a year. You can use Radiopaedia cases in a variety of ways to help you learn and teach. Menisci. link. STATdx includes over 200,000 searchable images, including x-ray, CT, MR, and ultrasound images. Your doctor might recommend:Rest. Avoid activities that aggravate your knee pain, especially any activity that causes you to twist, rotate or pivot your knee. Ice. Ice can reduce knee pain and swelling. Medication. Over-the-counter pain relievers also can help ease knee pain. WebMucoid degeneration of the ACL is suspected when an apparently thickened and ill-defined ligament with increased signal intensity on all sequences in MRI is identified in a patient with Bethesda, MD 20894, Web Policies Non-operative therapy focused on non-steroidal anti-inflammatory drugs and physical therapy may be able to provide pain relief as well as improve mechanical function of the knee joint. Epub 2022 Apr 27. If incidental or minor symptomatic, treatment may need random icing and anti-inflammatory medicine. Knee Surg Sports Traumatol Arthrosc. Would you like email updates of new search results? Epub 2021 Sep 13. HHS Vulnerability Disclosure, Help Am J Sports Med. 2023 Jan 2;15(1):e33270. Radiographs and magnetic resonance imaging are frequently utilized to examine for osteoarthritis and to verify the presence of meniscal tears, in addition to ruling out other sources of pain. Accumulation of mucopolysaccharides at the meniscal interstitial area disrupts the collagen network and weakens the meniscus. In general, they are thought to present 5% in the knee. WebA meniscus can become damaged due to sudden trauma. Musculoskeletal. Unable to load your collection due to an error, Unable to load your delegates due to an error. With vascular penetration of Eur Radiol. 2). Degenerative meniscus tears, part of the aging process, are the most common reason for knee arthroscopy because many primary care physicians and orthopedic surgeons believe that meniscus tears always require surgery. This is not the case, says Rodney Benner, MD, an orthopedic surgeon at Shelbourne Knee Center. Many degenerative meniscus tears will get better without surgery. Results: 1 to 2 weeks if you have recovery movements with minimal pain. Invest Radiol. 3099067 Krych AJ, Reardon PJ, Johnson NR, Mohan R, Peter L, Levy BA, Stuart MJ. Registered in England & Wales No. The .gov means its official. Obtain permissions instantly via Rightslink by clicking on the button below: If you are unable to obtain permissions via Rightslink, please complete and submit this Permissions form. J Magn Reson Imaging. People also read lists articles that other readers of this article have read. Lee DR, Reinholz AK, Till SE, Lu Y, Camp CL, DeBerardino TM, Stuart MJ, Krych AJ. Such meniscal tears are not appropriate for repair most of the time (Fig. Ultrasound-guided injection into the cyst. Copyright 2019. T2-weighted spin-echo images and gradient-echo images proved to be less reliable (37.1% and 40.0% correctly diagnosed meniscal sections). Arch Orthop Trauma Surg. 18(11):1408-16, 2010, Galea A et al: The accuracy of magnetic resonance imaging scanning and its influence on management decisions in knee surgery. 2022 Oct;38:1-8. doi: 10.1016/j.knee.2022.06.001. Knee. We retrospectively studied the role of different MR sequences in 175 anatomic meniscal sections originating from 20 freshly frozen knees from 10 cadavers using MR-anatomic correlation. Federal government websites often end in .gov or .mil. 14(6):935-45, 2013, Hunter D: Degeneration of the meniscus and progression of osteoarthritis. Meniscal degeneration is a process that often occurs due to gradual wear and is commonly associated with advanced knee osteoarthritis. It may or may not be associated with a chronic tear. See also meniscal tears meniscal fraying 404-407. Save the meniscus. Degenerative Changes of the Menisci of t . Medicine, Dentistry, Nursing & Allied Health. The immovable harm at the site of the cyst, more commonly over the outer part of the knee. To learn about our use of cookies and how you can manage your cookie settings, please see our Cookie Policy. Disclaimer. 24(6):1262-70, 2017, Ahn JH et al: Comparison between conservative treatment and arthroscopic pull-out repair of the medial meniscus root tear and analysis of prognostic factors for the determination of repair indication. (1993). Diagnosis. (1987) Radiology. h~: - 177(5):1189-92, 2001, Jerosch J et al: Age-related magnetic resonance imaging morphology of the menisci in asymptomatic individuals. Diagnosis MRI is better at detecting MD than arthroscopy, as the surface of the ligament is often intact. see full revision history and disclosures. Purpose To determine whether anterior cruciate ligament (ACL) mucoid degeneration in participants with or at risk for osteoarthritis is associated with longitudinal risk of radiographic progression of medial tibiofemoral compartment joint space loss (JSL). This test can confirm the diagnosis and set up the size and location of the wound. Arch Orthop Trauma Surg. Bulging of the posterior horn and disappearing contour of the meniscus. 8600 Rockville Pike Register a free Taylor & Francis Online account today to boost your research and gain these benefits: Degenerative Changes of the Menisci of the Knee, Departments of Radiology and Pathology, VA Medical Center, San Diego, CA, USA, /doi/epdf/10.1080/02841859309173268?needAccess=true. As you age and your cartilage becomes worn from supporting your weight, it can begin to weaken National Library of Medicine For instance, myxoid degeneration of the tendon occurs when the normal fibrilary appearance of the tendon is replaced by a homogenous, opaque, mucoid type of tissue. Trauma. Bakers cyst is a collection of fluid that is most commonly present on the inside of the back of the knee. To access all images, please log in or subscribe. Clipboard, Search History, and several other advanced features are temporarily unavailable. Would you like email updates of new search results? Disclaimer. government site. The pathology deserves special interest as it may lead to loss of the meniscus even in very and transmitted securely. Arthroscopic lavage and debridement for osteoarthritis of the knee: an evidence-based analysis. 115(3-4):199-202, 1996, Peterfy CG et al: "Magic-angle" phenomenon: a cause of increased signal in the normal lateral meniscus on short-TE MR images of the knee. Recoveries are different and depend on many things. Unauthorized use of these marks is strictly prohibited. But here is some timing for returning to activities. official website and that any information you provide is encrypted All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. Accessibility 25(5):473-80, 2009, Low AK et al: Clinical significance of intrasubstance meniscal lesions on MRI. J Microsc Ultrastruct. The .gov means its official. Intra-articular steroid/bupivacaine knee joint injection reduced pain symptoms in the majority of patients (81.7%) with degenerative tears of the posterior horn of the medial meniscus, usually with a sustained response. It is attested by MRI, which offers both the cyst and the related meniscus tear. Unauthorized use of these marks is strictly prohibited. adj.. a conversion of any of the connective tissues into a gelatinous or mucoid substance. Mucoid degeneration of PCL can produce symptoms of pain on flexion or restricted terminal flexion. 20(6):471-2, 2012, Subhas N et al: Accuracy of MRI in the diagnosis of meniscal tears in older patients. Mucoid degeneration; Expulsion of synovial fluid; Risk Factors. Continued hoop and shear stresses upon the degenerative meniscus results in gross failure, often in the form of complex tears in the posterior horn and midbody. The take-home message is surgery for degenerative meniscus tears, the most common type in adults, do not often require surgery. If you have arthritic changes on the MRI as well as the meniscus tear, it is often arthritis that is causing the pain. The PubMed wordmark and PubMed logo are registered trademarks of the U.S. Department of Health and Human Services (HHS). National Library of Medicine Orthop Traumatol Surg Res. When people over the age of 40 get a torn meniscus, the tissue tends to be less healthy and less likely to heal, with or without surgery. Careers. Ultrasonography. Preprocedural MRI findings were correlated with duration of symptoms, clinical response to injection (recorded as complete, partial or no response) and duration of response to injection. Ultrasonography-guided intra-articular steroid injection in the hip for symptomatic round ligament partial tear or degeneration. Recommended articles lists articles that we recommend and is powered by our AI driven recommendation engine. 135(9):1265-76, 2015, Fischenich KM et al: Effects of degeneration on the compressive and tensile properties of human meniscus. Osteoarthritis Cartilage. 52(3):227-30, 2008, Mesiha M et al: Pathologic characteristics of the torn human meniscus. Short description: Other meniscus derangements, Aidos L, Modina SC, Millar VRH, Peretti GM, Mangiavini L, Ferroni M, Boschetti F, Di Giancamillo A. Bioengineering (Basel). Case study, Radiopaedia.org (Accessed on 23 Nov 2022) https://doi.org/10.53347/rID-11047 2017. Knee Surg Sports Traumatol Arthrosc. 10(6):634-40, 1994, Hodler J et al: Degenerative changes of the menisci of the knee. To access 4,300 diagnoses written by the world's leading experts in radiology. Meniscal tears: pathologic correlation with MR imaging. 198(6):W575-80, 2012, Sun Y et al: Meniscal calcification, pathogenesis and implications. PMC Arch Orthop Trauma Surg. mucous degeneration degeneration with accumulation of mucus in epithelial tissues.