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Bone as Supporting Connective Tissue

Bone as Supporting Connective Tissue

Bone tissue forms the internal skeleton of vertebrate animals, providing structure to the body.
Bone Matrix
Bone, or osseous tissue, is a connective tissue that has a large amount of two different types of matrix material. The organic matrix is similar to the matrix material found in other connective tissues, including some amount of collagen and elastic fibers. This gives strength and flexibility to the tissue. The inorganic matrix consists of mineral salts— mostly calcium salts— that give the...

Aneurysm I: Introduction

Aneurysm I: Introduction

An aortic aneurysm is a localized outpouching or dilation at a weak point in the artery wall. It may involve different parts of the aorta, such as the abdominal aorta, aortic arch, or thoracic aorta.Etiological factorsSeveral disorders are associated with aortic aneurysms.Congenital causes, such as primary connective tissue disorders like Marfan syndrome, impact the integrity and strength of connective tissues, notably affecting the aorta. Marfan syndrome is a genetic disorder that specifically...

Compact Bone

Compact Bone

Most bones contain compact and spongy osseous tissue, but their distribution and concentration vary based on the bone's overall function.
Compact bone, also called cortical bone, is the denser, stronger of the two types of bone tissue. It is found under the periosteum and in the diaphyses of long bones, where it provides support and protection. The microscopic structural unit of compact bone is called an osteon, or haversian system. Each osteon is composed of concentric rings of calcified...

Bone Structure

Bone Structure

Within the skeletal system, the structure of a bone, or osseous tissue, can be exemplified in a long bone, like the femur, where there are two types of osseous tissue: cortical and cancellous.

Spongy Bone

Spongy Bone

All bones comprise an outer layer of compact bone, and an interior made up of spongy bone tissue, also called cancellous or trabecular bone. In long bones, spongy bone tissue is mainly found in the interior of the epiphyses (broad ends of the bone).
Spongy bone is more porous, and less dense compared to compact bone. It is composed of concentric lamellae that are arranged irregularly to form the trabecular network. In some bones, the spaces between trabeculae contain red marrow, where...

Growth of Cartilage and Bone Tissue

Growth of Cartilage and Bone Tissue

Chondrocytes form a temporary cartilaginous model by dividing and secreting a thick gel-like extracellular matrix. Once the chondrocytes undergo programmed cell death, osteoblasts enter the site of the cartilaginous model. The process of replacing the temporary cartilaginous model with bone in an ordered manner is called endochondral ossification. In endochondral ossification, not all of the cartilage is replaced by bone tissue. Some cartilage that performs a protective and supportive function...

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Related Experiment Video

Updated: May 17, 2026

Models of Bone Metastasis

Models of Bone Metastasis

Published on: September 4, 2012

Primary aneurysmal cyst: bone type in the breast.

Grace F D'Costa¹, Meenal S Hastak, Yoganand V Patil

¹Grant Med. College, Byculla Mumbai, 400 008 India.

The Indian Journal of Surgery

|November 8, 2012

Summary

A rare case of extrosseous aneurysmal bone cyst presenting as a large breast lump in a 60-year-old woman is described. This benign stromal lesion required surgical removal due to its size.

Area of Science:

Oncology
Orthopedics
Radiology

Background:

Breast lumps are common, but extrosseous aneurysmal bone cysts are exceptionally rare presentations.
Fine needle aspiration cytology (FNAC) can be used for initial diagnosis of breast lesions.

Purpose of the Study:

To report the first described case of primary extrosseous aneurysmal bone cyst of the bone occurring in the breast.
To highlight diagnostic challenges and management of this rare breast mass.

Main Methods:

Case presentation of a 60-year-old woman with a large breast lump.
Clinical examination, fine needle aspiration cytology (FNAC), and surgical mastectomy.

Main Results:

A large, irregular, hard mass was found in the right breast.

Keywords:

Aneurysmal cyst Breast

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Last Updated: May 17, 2026

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FNAC suggested a benign stromal lesion.

Surgical mastectomy was performed due to the mass size.

Conclusions:

Primary extrosseous aneurysmal bone cyst of the bone is an extremely rare cause of a breast mass.
This case underscores the importance of considering rare differential diagnoses in breast pathology.