is low infection-fighting white cells (neutrophils) in adults without known cause.

is an infiltrative brain tumor from star-shaped cells (astrocytes) in adults.

is a rare illness from gut colonization producing botulinum toxin causing paralysis.

is a rare aggressive meningeal (brain covering) tumor that can spread.

is a rare inherited leukodystrophy causing progressive nerve damage in adults.

is a rare melanoma of brain and spinal cord coverings (leptomeninges).

is a cancer of fat tissue (soft tissue sarcoma) in adults.

is a cancer of the lymphatic system; types and symptoms vary.

is a rare vascular soft-tissue cancer that can recur and spread.

is a rare, aggressive soft tissue cancer with multiple mesenchymal components.

is rare, aggressive nerve sheath cancer, often linked to neurofibromatosis type 1.

is a rare, aggressive cartilage cancer of bone or soft tissues.

is a rare inherited brain disorder causing seizures, movement, and thinking problems.

is a rare, fast-growing brain-covering tumor with high recurrence risk.

is a rare adult pineal gland brain tumor causing headaches, vision problems.

is a rare, aggressive brain tumor of the pineal gland.

is a rare, aggressive soft tissue cancer arising from skeletal muscle.

is a rare inherited disorder that affects nerves, bladder, and movement.

is a life-threatening lung condition causing severe inflammation and breathing failure.

is a rare spinal cord tumor that can cause progressive symptoms.

is an aggressive adult spinal cord cancer causing rapid neurological decline.

is a rare genetic ectodermal disorder affecting skin, nails, teeth, limbs.

is a rare, often aggressive, T-cell blood cancer linked to HTLV‑1.

is a tumor with mixed embryonic tissues, benign or malignant.