Chondroid metaplasia of paraspinal connective tissue in the degenerative spine / 대한해부학회지

A 51-year-old male was routinely biopsied during a paraspinal muscle study. The biopsy sample was taken from the right erector spinae muscle at the fourth lumbar vertebra. The patient had no history of (diagnosed) major back trauma. The obtained sample was histologically analyzed (hematoxylin and eosin, safranin O), and complementary magnetic resonance imaging was performed. The biopsied sample contained chondroid tissue. Based on its location, the biopsy sample was appointed as chondroid metaplasia. Although chondroid metaplasia is not uncommon in humans, this is the first report of chondroid metaplasia within the paraspinal connective tissue. We propose a novel mechanism to explain the paraspinal chrondrogenic changes, related to spinal degeneration.

The diffuse giant cell tumor of tendon sheath with chondroid metaplasia in right temporomandibular joint: a case report / 华西口腔医学杂志

A case diagnosed as diffuse giant cell tumor of tendon sheath with chondroid metaplasia in right temporomandibular joint was reported. The clinicopathological features, diagnosis, and treatment were discussed with the literature review.

Rare lesions of the breast Fibrocystic disease with chondroid metaplasia, giant lipoma and fibroadenoma with atypical ductal hyperplasia.

This paper focused on 3 rare lesions of breast - an exceedingly rare case of fibrocystic disease of breast with predominantly chondroid metaplasia. Giant lipoma of breast which is infrequently observed because of rarity in size and location, with only very few case reports available in literature and fibroadenoma with atypical ductal hyperplasia(ADH) of breast which is an unusual finding in the adolescent or young adult female.

Recurrent posterior fossa anaplastic ependymoma with prominent chondroid metaplasia: A case report and review of literature.

We report an unusual case of a recurrent fourth ventricular anaplastic ependymoma with prominent chondroid metaplasia in a 16-year-old male. On initial presentation, the patient had a WHO Grade II tumor. However, at recurrence 1 year later, the tumor progressed to WHO Grade III tumor with more cellularity, necrosis and brisk mitotic activity. Chondroid metaplasia was present in both the initial and recurrent tumors.

Unusual nodular lesion of the tongue: clinical report of chondroid metaplasia / Lesão incomum de língua: relato clínico de metaplasia condoide

OBJETIVOS: Revisar os conceitos de metaplasia condroide e relatar um caso incomum desta rara condição que se apresentou como uma massa nodular na borda lateral da língua em um paciente adolescente. DISCUSSÃO E CONCLUSÃO: Metaplasia é a conversão, na vida pós-natal, de um tipo de célula para outra. Pode ser causada por algum estímulo anormal. A origem de cartilagem em tecidos moles bucais é desconhecida, mas várias hipóteses foram postuladas. Embora a etiopatogênese seja incerta, sugeriu-se que a metaplasia condroide ocorre como uma reação defensiva e originada de células mesenquimais miltipotentes. A metaplasia condroide é uma alteração benigna que ocorre como resposta à irritação crônica física ou química. A diferenciação entre coristoma cartilaginoso e metaplasia condroide pode ser difícil e, muitas vezes, uma questão de conceito. Considerando os achados do presente caso, a condição foi diagnosticada como metaplasia condroide de língua.

OBJECTIVES: To review the concepts of chondroid metaplasia and to report an unusual case of this rare condition, presenting as a nodular soft tissue mass in the lateral border of the tongue in an adolescent. DISCUSSION AND CONCLUSION: Metaplasia means the conversion, in postnatal life, of one cell type to another. It could be caused by some abnormal stimuli. The origin of cartilage in the oral soft tissues is unknown but several hypotheses have been postulated. Although the etiopathogenesis is unclear, it has been suggested that chondroid metaplasia may occur as a defensive reaction and it is originated from multipotential mesenchymal cells. Chondroid metaplasia is a benign change that occurs as a response to chronic physical or chemical irritation. The differentiation between cartilaginous choristoma and chondroid metaplasia could be very difficult and sometimes a matter of concept. Considering the findings of the current case, the lesion was diagnosed as chondroid metaplasia of the tongue.